BigBattery NEXUS + APEX-6.5K Off-Grid System
BigBattery NEXUS + APEX-6.5K Off-Grid System
Description
Introducing The APEX Inverter Series
Meet the BigBattery APEX Off-Grid Hybrid Inverter Series (6.5K & 10K)—engineered for true energy independence with two power-class options to match your build. Both models deliver split-phase 120/240V at 50/60 Hz with clean, pure sine-wave output, pairing seamlessly with modern LiFePO₄ battery banks for stable, efficient performance. Designed for real-world autonomy, APEX supports solar and generator inputs so you can stay powered day and night, season after season.
Built to handle demanding loads, the APEX Series features an 80A pass-through to keep large appliances and critical circuits running smoothly, while wide operating temperatures and an outdoor-ready enclosure provide dependable performance in harsh conditions. With installer-friendly bottom-entry wiring and intelligent protections baked in, APEX is a rugged, efficient, and practical backbone for cabins, homesteads, remote residences, and off-grid properties—delivering a streamlined path to reliable, all-day power.
Whole-Home Split-Phase Power
Delivers clean, pure sine-wave electricity to run larger appliances and essential circuits with confidence. Ideal for cabins, homesteads, and off-grid homes that need true 120/240V performance.
Solar Ready Set-Up
Designed to accept both solar and generator inputs on APEX-6.5K so you can stay powered day and night. When sunlight dips, your generator can seamlessly keep the system charging and your loads running.
Off-Grid Reliability
Installer-friendly bottom-entry wiring and built-in protections help keep your setup clean, safe, and dependable for any remote residences. Inputs vary on both inverters, read the specification sheet for more information on inputs between both inverters.
Go Big On Power
The APEX inverter series & NEXUS battery kit paired together is the ultimate solar set up for all off-grid enthusiasts, whether its a cozy log cabin, modest tiny home or a vast ranch, this ESS was designed to ensure your energy independence, protect yourself from outages & blackouts and stay powered.
APEX-6.5K INVERTER INPUTS
APEX-10K INVERTER INPUTS
| INVERTER INPUTS | APEX-6.5K | APEX-10K |
|---|---|---|
| Grid | yes | yes |
| Load | yes | yes |
| Generator | yes | yes* |
| BAT – | yes | yes |
| BAT + | yes | yes |
| PV | yes | yes |
| Parallel Connection | yes | yes |
| USB | yes | yes |
| CT | yes | no |
| WiFi | yes | yes |
| RS485/CAN | yes | yes |
| Dry Contact | yes | yes |
*For the APEX-10K, single AC input supports either grid or generator (not simultaneously).
Product Specifications
BigBattery NEXUS + APEX-6.5K Off-Grid System Product Specifications
Battery Specifications
| Category | Specification | Details |
|---|---|---|
| General | Battery Model | NEXUS 15kWh |
| Chemistry | LiFePO4 | |
| Usable Energy | 15 kWh | |
| Electrical | System Voltage | 48 V |
| Nominal Voltage | 51.2 V | |
| Capacity | 300 Ah | |
| Cell Configuration | 16S1P | |
| Max Continuous Discharge Current | 140 A | |
| Max Continuous Power | 7.6 kW | |
| Max Discharge Peak Current | 270 A (1s) | |
| Max Charge Current | 140 A | |
| Charging Voltage Range | 53.5 V – 57.6 V | |
| Operating Voltage Range | 48 V – 57.6 V | |
| Max Charge Voltage | 57.9 V | |
| Suggested Low Voltage Cutoff | 50.8 V | |
| Temperature | Charge Temperature Range | 32°F – 113°F |
| Discharge Temperature Range | -4°F – 113°F | |
| Optimal Discharge Temperature | 59°F – 95°F | |
| Storage Temperature (SoC >50%) | 1 month: -4°F – 113°F3 months: -4°F – 95°F6 months: -4°F – 77°F | |
| Environmental | Humidity Range | 10% – 95% (non-condensing) |
| Protection Rating | IP54 | |
| Altitude Limit | < 2000 m | |
| Physical | Weight | ~315 lbs |
| Dimensions (W × H × D) | 19.7 × 27.5 × 15.7 in(500 × 700 × 400 mm) | |
| System | Max Parallel Connections | 15 units (up to 225 kWh) |
| Communications | RS485 / RJ45 / CAN | |
| Installation | Indoor, floor-standing |
Inverter Specifications
| Category | Specification | Details |
|---|---|---|
| General | Document Title | APEX-6.5K Inverter Specifications |
| Brand | BigBattery | |
| Model | APEX-6.5K | |
| Inverter Output | Rated Output Power | 6,500 W |
| Max. Output Power | 13,000 VA | |
| Rated Output Voltage | 120/240 Vac (single-phase / split-phase) | |
| Load Capacity of Motors | 4 HP | |
| Rated Frequency | 50/60 Hz | |
| Output Wave | Pure sine wave | |
| Switching Time | 10 ms (typical) | |
| Battery | Battery Type | Lithium-ion / Lead-acid / User-defined |
| Rated Battery Voltage | 48 V | |
| Voltage Range | 40–60 Vdc | |
| Max. Solar Charging Current | 140 A | |
| Max. Grid / Generator Charging Current | 80 A | |
| Max. Hybrid Charge Current | 140 A | |
| Solar Input | No. of MPPT | 1 + 1 |
| Max. Input Power | 5,000 W + 5,000 W | |
| Max. Input Current | 18 A + 18 A | |
| Max. Open Circuit Voltage | 550 Vdc + 550 Vdc | |
| MPPT Voltage Range | 125–450 Vdc | |
| Grid / Generator Input | Input Voltage Range | 65–140 Vac |
| Input Frequency Range | 50/60 Hz | |
| Bypass Overload Current | 40 A | |
| AC Inputs | 2 inputs (Grid & Generator) | |
| Efficiency | Max. Efficiency | 99.9% |
| MPPT Tracking Efficiency | 93% | |
| Parallel Capacity | Up to 6 units (more than 3 can form three-phase output) | |
| General Data | Dimensions (L × W × H) | 25.51 × 16.14 × 5.51 inches |
| Weight | 48 lbs | |
| Protection Degree | IP20 (indoor only) | |
| Operating Temperature | 14–131°F (derate above 113°F) | |
| External Module (Optional) | Wi-Fi / GPRS | |
| Noise | < 60 dB | |
| Cooling Method | Intelligent fan | |
| Warranty | 5 years | |
| Communication | RS485 / CAN / USB / Dry contact | |
| Integrated Circuit Breaker | Utility / Load / Battery / PV | |
| Certifications | UL1741, RoHS, EN61000-6-1, EN61000-6-3, FCC Part 15 Class B, IEC62109-1, IEC62109-2 | |
| Overload Protection | Overload Protection Behavior | Output restores after 3 minutes. After 5 overloads, output shuts off until inverter is restarted. |
| Protection Features | PV current limiting, PV over-voltage, PV night reverse current, AC input over/under-voltage, battery over/under-voltage, battery over-current, AC output short-circuit, heat sink over-temperature, inverter overload protection |
Product Manual
Battery Spec Sheet
Battery User Manual
Inverter Spec Sheet
Inverter User Manual
Product Warranty
BigBattery 12-Year Limited Warranty
In the unlikely event you are having an issue with one of our batteries, we have developed a simple Warranty & Return Policy servicing all customers in the USA.
1. Length Of Warranty
All our batteries come with a 12-Year 1 Repair/Replacement Warranty. If our batteries malfunction due to component or manufacturing error, the product will be repaired or replaced.
2. Full Lifetime Tech Support & Customer Service
We provide free lifetime tech support & troubleshooting service for all BigBattery products. If you have any questions or need any help, simply call us at (818) 280-3091 from 9am – 5pm, Monday – Friday, or send us an email anytime at [email protected].
3. Free Repair & Replacement
We stand by the quality of our batteries. If any parts within our battery fail due to defects or manufacturing error within 12 years 1, we will fix or replace your battery at no cost.
4. Highest Quality Guarantee
BigBattery utilizes new Tier-1 cells and vetted component suppliers to manufacture the highest quality lithium battery packs in the USA. Depending on the model, use case, and environment, your battery is designed to last between 5,000 – 8,000 cycles when used as intended within our published battery specifications.
5. Covered Products
This warranty covers all battery products from the date of purchase from BigBattery for 12 years1 and all included accessories for 1 year.
6. Automated Warranty Registration
No warranty registration is needed by the customer. Warranties are automatically recorded in our internal customer database via serial number and QR code.
7. Product Manuals & Specification Sheets
BigBattery provides a proprietary QR code on every battery. Scan this QR code with any phone to view the product manual and product spec sheet for your specific battery model. Providing these documents to you in a digital format provides you the most updated information for your product in real-time while not 1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
wasting paper to help protect the environment. You can also visit our website Bigbattery.com to view the most updated specsheet and manual.
8. Domestic Warranty Claim Support
To start a warranty claim, please email us directly at [email protected] to create a warranty claim ticket. Include a written description of the problem and pictures if possible. Upon receipt, our Tech Support team will reach out to you within 24 – 48 hours to troubleshoot.
If the battery issue is reported within one year of purchase and it’s under warranty, BigBattery will cover round-trip shipping and provide a return label at no cost. After the first year, you can either pay for shipping or arrange your own to and from BigBattery. If a return label is provided, please place a copy inside the return box or pallet for our third-party logistics provider to collect.
All returns will be inspected prior to repair, replacement, or reimbursement, depending on the circumstances of return and availability of similar items. For detailed instructions, please review our Warranty Repair/Replacement Services section below.
9. Returning Accessories
This warranty includes a 1-Year Replacement for all accessories (connectors, wiring, chargers, etc.) included with your battery. If products returned are not defective, refunds will be offered based on the purchase price of the unit minus a 20% restocking fee.
10. 30-Day Money Back Guarantee
All our batteries come with a 30-Day Money Back Guarantee on products. Reimbursements will not include shipping costs or restocking fees. To enact your Money Back Guarantee simply call (818) 280-3091 or email customer service at [email protected].
11. Transferability
For batteries installed in a stationary structure, such as permanently mounted home and commercial solar batteries, the warranty is transferable as long as the battery remains at the original end-user’s location, and the transferee submits a Change Of Ownership Request to BigBattery via email within 30 days from customer ownership. To submit the transfer request, send the original purchase documentation and transfer purchase documentation to [email protected]. Timely submission is required for continued warranty coverage.
For mobile batteries and those installed in mobile systems, the warranty may be transferred to a new owner provided that: (1) the new owner can supply documentation of each transfer of ownership, establishing a clear paper trail (such as a bill of sale, title transfer, or dealer invoice) along with the original proof of purchase; and (2) the battery remains installed in its original vehicle or system.
(1) Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and batteries purchased after Oct 2024 have a 12 year warranty.
12. Return Hazmat Fee
Due to shipping regulations for lithium batteries, certain battery returns may require special documentation and packaging. For Parcel RMAs, if the customer no longer has the original box the battery was shipped in, they must purchase a Hazmat-compliant battery box—available through BigBattery or any certified compliance center. Additional fees may apply if the return involves a battery not covered under our Repair and Replacement Policy.
13. Battery Abuse Disclaimer
This warranty does not cover damages resulting from misuse, abuse, accidents, alterations, or improper charging or installation of our product. Please scan the QR code on your battery and read the manual prior to installation and charging. DIY modifications or damage due to gross negligence or abuse will void your warranty.
14. Fraud Protection
Repair, replacement, and refunds for your purchase will only be possible after your returned battery has been received and fully inspected at our facility. Please reference your warranty claim ticket provided by customer service via email when contacting our customer service team at [email protected].
15. Limitation of Damages
In no event shall BigBattery be liable for any consequential, incidental, or special damages arising out of or related to any breach of this warranty.
16. Warranty Details
● 12-Year1 Repair/Replacement Warranty Coverage Details: BigBattery guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years1 from the date of purchase, automatically registered upon purchase. This warranty is extended exclusively to the original purchaser for the entire 12-year1 duration.
● Our batteries are engineered to operate for a minimum of 12 years1 with zero maintenance required. Depending on the model, usage, and environmental conditions, some batteries may last up to 22 years.
● BigBattery batteries are also warranted to maintain a reasonable capacity over time (refer to exclusions for specific limits). In the event of a diminished capacity claim, customers may return the battery for capacity testing. We will conduct a comprehensive bench test and provide a full cycle test report. If the battery’s capacity is found to be below the limits specified in the exclusions section, it will qualify for warranty service. Customers will not incur any costs for the testing, regardless of the results.
● Under this 12-Year (1) Warranty, BigBattery will repair or replace any part proven to be defective in material or workmanship. All warranty repairs and services must be conducted by an authorized BigBattery technician or at an authorized BigBattery service facility unless directed otherwise in writing by a BigBattery representative. If repair is not possible, BigBattery may replace the defective product with a refurbished product of similar capacity which was designed for the same application. If the customer prefers a new product, or if a refurbished product is not available, BigBattery may, at its sole discretion, provide a new product of similar capacity. In such case, beginning in the second year of the warranty, the customer will be responsible for one-twelfth (1/12) of the cost of a new product for each year of ownership.
(1) Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and batteries purchased after Oct 2024 have a 12 year warranty.
● For the first year, the expenses related to returning and repairing a defective part will be assumed by BigBattery within the continental US, including pickup, return shipping, repair, replacement, and final shipping if the battery is under warranty. This warranty does not assume responsibility for disconnection, service interruption, or re-packing expenses per said return shipment. Customers with international warranty claims will need to cover the cost of shipping.
● Defective Parts Return: For the first year, BigBattery will cover all expenses related to the return, repair, or replacement of a defective part within the continental United States, including pickup, shipping, repair, replacement, and return shipping to the customer if the battery is under warranty. After the first year, the customer can either pay for shipping or arrange their own shipping to and from BigBattery. This warranty does not cover costs related to customers’ disconnection, service interruption, or re-packing. Customers with international warranty claims (outside of the USA) are responsible for covering shipping costs to BigBattery. All returns should be shipped to our RMA HQ with proper paperwork included:
Return Address
BigBattery
400 Maple St.
Commerce, TX 75428
17. Warranty Exclusions
This warranty does not cover any costs, repairs, shipping, or services for the following:
A. Damage resulting from misuse, abuse, accidents, alterations, use beyond the intended application, collision, dropping, or improper installation.
B. Use of the product outside of specified conditions or using a product undersized for the application.
C. Corrective work required due to repairs performed by anyone other than an authorized BigBattery technician, unless previously approved by BigBattery Tech Support.
D. Environmental damage, including exposure to caustic substances, saltwater, or outdoor elements, unless the battery is specifically indicated for outdoor use on the product label, specification sheet, or user manual.
E. Claims of diminished capacity that are less than 25% within the 12 year1 warranty period.
F. Improper charging, discharging, or storage, including over-discharging. If the battery is discharged below 10%, charge the battery within 48 hours. Allowing the battery to remain in a low charged state may cause permanent damage which will void the warranty. During long term storage, it is recommended to charge the battery to at least 80%, turn off or disconnect the battery to ensure there are no parasitic loads, 1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
and check the charge levels every 30 days. If you are unable to charge the battery, contact BigBattery immediately to avoid voiding the warranty due to over-discharge damage.
G. On-site service calls from third parties.
Warning: The warranty will be void if the battery is opened, disassembled, or improperly altered unless explicitly directed by BigBattery for technical support.
18. Accessories
BigBattery provides a limited warranty for all BigBattery accessories sold through our company, including but not limited to BigBattery chargers. This does not include products branded by another manufacturer, which are covered in Section 19. The BigBattery accessory warranty covers any defects in material or workmanship under normal use for a period of one (1) year from the date of purchase. During the warranty period, BigBattery will repair or replace, at no charge, products or parts that prove defective due to improper material or workmanship under normal use and maintenance.
Warranty Coverage Conditions:
A. The warranty is valid only if the product is used properly with the compatible BigBattery products.
B. Any modification, misuse, or improper installation voids this warranty.
C. This warranty does not cover normal wear and tear or damage caused by accidents, negligence, or unauthorized modifications.
For warranty claims, proof of purchase is required, and the customer must contact BigBattery customer service at [email protected] for further instructions.
19. Non-BigBattery Branded Products
Non-BigBattery branded products sold by BigBattery are covered exclusively by the original manufacturer’s warranty. The warranty terms and conditions for these products can be found on the respective product pages or by contacting our customer support team. BigBattery offers technical support for all products BigBattery sells.
Important Notes:
A. BigBattery does not extend or modify the warranty terms provided by the original manufacturer.
B. Any warranty claims, service, or support for these products must be directed to the original manufacturer as per their specified terms and conditions.
C. Customers are encouraged to review the manufacturer’s warranty policies to fully understand coverage, exclusions, and claim processes. For assistance in locating the manufacturer’s warranty details or for further inquiries, please reach out to our customer support team. 1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
20. Warranty Claims Process
To start a warranty repair or replacement, contact BigBattery Tech Support to confirm the issue and find a solution with our team. If your battery needs to be returned for repair or replacement, customer service will help arrange shipping to and from our repair facility. Please pack the battery securely, preferably in the original packaging, and include a copy of your original purchase receipt with detailed notes about the issue. Follow the packing instructions provided by customer service ([email protected] / (818) 280-3091). We record all communications to ensure a quick resolution. If BigBattery arranges the shipping, we take responsibility for the safe transportation of your battery to and from our repair facility:
Return Address
BigBattery
400 Maple St.
Commerce, TX 75428
21. Return Packing Instructions
Customers must take pictures of the product(s) being returned prior to packing and email these pictures to [email protected]. These pictures allow BigBattery to hold the logistics provider responsible for any potential damages that could occur during transit.
Please safely pack your returned battery. Logistics carriers DO NOT accept liability for unsafely packed batteries during transit. To prevent damage, use the original box and foam inserts provided. If the original packaging is not available, pack your product in a similarly safe and secure format, using a box or pallet for delivery to our repair center.
BigBattery assumes full responsibility for returning your repaired and/or replaced batteries to you. Transit will occur between your physical address and our authorized service center located at 400 Maple St. Commerce, TX 75428.
22. Legal
This warranty shall be governed by and interpreted in accordance with the laws of the state of Texas. No employee or representative of the manufacturer is authorized to provide any warranty in addition to the terms outlined within this agreement.
1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
Product FAQs
NA
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
BigBattery NEXUS + APEX-6.5K Off-Grid System
Description
Introducing The APEX Inverter Series
Meet the BigBattery APEX Off-Grid Hybrid Inverter Series (6.5K & 10K)—engineered for true energy independence with two power-class options to match your build. Both models deliver split-phase 120/240V at 50/60 Hz with clean, pure sine-wave output, pairing seamlessly with modern LiFePO₄ battery banks for stable, efficient performance. Designed for real-world autonomy, APEX supports solar and generator inputs so you can stay powered day and night, season after season.
Built to handle demanding loads, the APEX Series features an 80A pass-through to keep large appliances and critical circuits running smoothly, while wide operating temperatures and an outdoor-ready enclosure provide dependable performance in harsh conditions. With installer-friendly bottom-entry wiring and intelligent protections baked in, APEX is a rugged, efficient, and practical backbone for cabins, homesteads, remote residences, and off-grid properties—delivering a streamlined path to reliable, all-day power.
Whole-Home Split-Phase Power
Delivers clean, pure sine-wave electricity to run larger appliances and essential circuits with confidence. Ideal for cabins, homesteads, and off-grid homes that need true 120/240V performance.
Solar Ready Set-Up
Designed to accept both solar and generator inputs on APEX-6.5K so you can stay powered day and night. When sunlight dips, your generator can seamlessly keep the system charging and your loads running.
Off-Grid Reliability
Installer-friendly bottom-entry wiring and built-in protections help keep your setup clean, safe, and dependable for any remote residences. Inputs vary on both inverters, read the specification sheet for more information on inputs between both inverters.
Go Big On Power
The APEX inverter series & NEXUS battery kit paired together is the ultimate solar set up for all off-grid enthusiasts, whether its a cozy log cabin, modest tiny home or a vast ranch, this ESS was designed to ensure your energy independence, protect yourself from outages & blackouts and stay powered.
APEX-6.5K INVERTER INPUTS
APEX-10K INVERTER INPUTS
| INVERTER INPUTS | APEX-6.5K | APEX-10K |
|---|---|---|
| Grid | yes | yes |
| Load | yes | yes |
| Generator | yes | yes* |
| BAT – | yes | yes |
| BAT + | yes | yes |
| PV | yes | yes |
| Parallel Connection | yes | yes |
| USB | yes | yes |
| CT | yes | no |
| WiFi | yes | yes |
| RS485/CAN | yes | yes |
| Dry Contact | yes | yes |
*For the APEX-10K, single AC input supports either grid or generator (not simultaneously).
Product Specifications
BigBattery NEXUS + APEX-6.5K Off-Grid System Product Specifications
Battery Specifications
| Category | Specification | Details |
|---|---|---|
| General | Battery Model | NEXUS 15kWh |
| Chemistry | LiFePO4 | |
| Usable Energy | 15 kWh | |
| Electrical | System Voltage | 48 V |
| Nominal Voltage | 51.2 V | |
| Capacity | 300 Ah | |
| Cell Configuration | 16S1P | |
| Max Continuous Discharge Current | 140 A | |
| Max Continuous Power | 7.6 kW | |
| Max Discharge Peak Current | 270 A (1s) | |
| Max Charge Current | 140 A | |
| Charging Voltage Range | 53.5 V – 57.6 V | |
| Operating Voltage Range | 48 V – 57.6 V | |
| Max Charge Voltage | 57.9 V | |
| Suggested Low Voltage Cutoff | 50.8 V | |
| Temperature | Charge Temperature Range | 32°F – 113°F |
| Discharge Temperature Range | -4°F – 113°F | |
| Optimal Discharge Temperature | 59°F – 95°F | |
| Storage Temperature (SoC >50%) | 1 month: -4°F – 113°F3 months: -4°F – 95°F6 months: -4°F – 77°F | |
| Environmental | Humidity Range | 10% – 95% (non-condensing) |
| Protection Rating | IP54 | |
| Altitude Limit | < 2000 m | |
| Physical | Weight | ~315 lbs |
| Dimensions (W × H × D) | 19.7 × 27.5 × 15.7 in(500 × 700 × 400 mm) | |
| System | Max Parallel Connections | 15 units (up to 225 kWh) |
| Communications | RS485 / RJ45 / CAN | |
| Installation | Indoor, floor-standing |
Inverter Specifications
| Category | Specification | Details |
|---|---|---|
| General | Document Title | APEX-6.5K Inverter Specifications |
| Brand | BigBattery | |
| Model | APEX-6.5K | |
| Inverter Output | Rated Output Power | 6,500 W |
| Max. Output Power | 13,000 VA | |
| Rated Output Voltage | 120/240 Vac (single-phase / split-phase) | |
| Load Capacity of Motors | 4 HP | |
| Rated Frequency | 50/60 Hz | |
| Output Wave | Pure sine wave | |
| Switching Time | 10 ms (typical) | |
| Battery | Battery Type | Lithium-ion / Lead-acid / User-defined |
| Rated Battery Voltage | 48 V | |
| Voltage Range | 40–60 Vdc | |
| Max. Solar Charging Current | 140 A | |
| Max. Grid / Generator Charging Current | 80 A | |
| Max. Hybrid Charge Current | 140 A | |
| Solar Input | No. of MPPT | 1 + 1 |
| Max. Input Power | 5,000 W + 5,000 W | |
| Max. Input Current | 18 A + 18 A | |
| Max. Open Circuit Voltage | 550 Vdc + 550 Vdc | |
| MPPT Voltage Range | 125–450 Vdc | |
| Grid / Generator Input | Input Voltage Range | 65–140 Vac |
| Input Frequency Range | 50/60 Hz | |
| Bypass Overload Current | 40 A | |
| AC Inputs | 2 inputs (Grid & Generator) | |
| Efficiency | Max. Efficiency | 99.9% |
| MPPT Tracking Efficiency | 93% | |
| Parallel Capacity | Up to 6 units (more than 3 can form three-phase output) | |
| General Data | Dimensions (L × W × H) | 25.51 × 16.14 × 5.51 inches |
| Weight | 48 lbs | |
| Protection Degree | IP20 (indoor only) | |
| Operating Temperature | 14–131°F (derate above 113°F) | |
| External Module (Optional) | Wi-Fi / GPRS | |
| Noise | < 60 dB | |
| Cooling Method | Intelligent fan | |
| Warranty | 5 years | |
| Communication | RS485 / CAN / USB / Dry contact | |
| Integrated Circuit Breaker | Utility / Load / Battery / PV | |
| Certifications | UL1741, RoHS, EN61000-6-1, EN61000-6-3, FCC Part 15 Class B, IEC62109-1, IEC62109-2 | |
| Overload Protection | Overload Protection Behavior | Output restores after 3 minutes. After 5 overloads, output shuts off until inverter is restarted. |
| Protection Features | PV current limiting, PV over-voltage, PV night reverse current, AC input over/under-voltage, battery over/under-voltage, battery over-current, AC output short-circuit, heat sink over-temperature, inverter overload protection |
Product Manual
Battery Spec Sheet
Battery User Manual
Inverter Spec Sheet
Inverter User Manual
Product Warranty
BigBattery 12-Year Limited Warranty
In the unlikely event you are having an issue with one of our batteries, we have developed a simple Warranty & Return Policy servicing all customers in the USA.
1. Length Of Warranty
All our batteries come with a 12-Year 1 Repair/Replacement Warranty. If our batteries malfunction due to component or manufacturing error, the product will be repaired or replaced.
2. Full Lifetime Tech Support & Customer Service
We provide free lifetime tech support & troubleshooting service for all BigBattery products. If you have any questions or need any help, simply call us at (818) 280-3091 from 9am – 5pm, Monday – Friday, or send us an email anytime at [email protected].
3. Free Repair & Replacement
We stand by the quality of our batteries. If any parts within our battery fail due to defects or manufacturing error within 12 years 1, we will fix or replace your battery at no cost.
4. Highest Quality Guarantee
BigBattery utilizes new Tier-1 cells and vetted component suppliers to manufacture the highest quality lithium battery packs in the USA. Depending on the model, use case, and environment, your battery is designed to last between 5,000 – 8,000 cycles when used as intended within our published battery specifications.
5. Covered Products
This warranty covers all battery products from the date of purchase from BigBattery for 12 years1 and all included accessories for 1 year.
6. Automated Warranty Registration
No warranty registration is needed by the customer. Warranties are automatically recorded in our internal customer database via serial number and QR code.
7. Product Manuals & Specification Sheets
BigBattery provides a proprietary QR code on every battery. Scan this QR code with any phone to view the product manual and product spec sheet for your specific battery model. Providing these documents to you in a digital format provides you the most updated information for your product in real-time while not 1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
wasting paper to help protect the environment. You can also visit our website Bigbattery.com to view the most updated specsheet and manual.
8. Domestic Warranty Claim Support
To start a warranty claim, please email us directly at [email protected] to create a warranty claim ticket. Include a written description of the problem and pictures if possible. Upon receipt, our Tech Support team will reach out to you within 24 – 48 hours to troubleshoot.
If the battery issue is reported within one year of purchase and it’s under warranty, BigBattery will cover round-trip shipping and provide a return label at no cost. After the first year, you can either pay for shipping or arrange your own to and from BigBattery. If a return label is provided, please place a copy inside the return box or pallet for our third-party logistics provider to collect.
All returns will be inspected prior to repair, replacement, or reimbursement, depending on the circumstances of return and availability of similar items. For detailed instructions, please review our Warranty Repair/Replacement Services section below.
9. Returning Accessories
This warranty includes a 1-Year Replacement for all accessories (connectors, wiring, chargers, etc.) included with your battery. If products returned are not defective, refunds will be offered based on the purchase price of the unit minus a 20% restocking fee.
10. 30-Day Money Back Guarantee
All our batteries come with a 30-Day Money Back Guarantee on products. Reimbursements will not include shipping costs or restocking fees. To enact your Money Back Guarantee simply call (818) 280-3091 or email customer service at [email protected].
11. Transferability
For batteries installed in a stationary structure, such as permanently mounted home and commercial solar batteries, the warranty is transferable as long as the battery remains at the original end-user’s location, and the transferee submits a Change Of Ownership Request to BigBattery via email within 30 days from customer ownership. To submit the transfer request, send the original purchase documentation and transfer purchase documentation to [email protected]. Timely submission is required for continued warranty coverage.
For mobile batteries and those installed in mobile systems, the warranty may be transferred to a new owner provided that: (1) the new owner can supply documentation of each transfer of ownership, establishing a clear paper trail (such as a bill of sale, title transfer, or dealer invoice) along with the original proof of purchase; and (2) the battery remains installed in its original vehicle or system.
(1) Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and batteries purchased after Oct 2024 have a 12 year warranty.
12. Return Hazmat Fee
Due to shipping regulations for lithium batteries, certain battery returns may require special documentation and packaging. For Parcel RMAs, if the customer no longer has the original box the battery was shipped in, they must purchase a Hazmat-compliant battery box—available through BigBattery or any certified compliance center. Additional fees may apply if the return involves a battery not covered under our Repair and Replacement Policy.
13. Battery Abuse Disclaimer
This warranty does not cover damages resulting from misuse, abuse, accidents, alterations, or improper charging or installation of our product. Please scan the QR code on your battery and read the manual prior to installation and charging. DIY modifications or damage due to gross negligence or abuse will void your warranty.
14. Fraud Protection
Repair, replacement, and refunds for your purchase will only be possible after your returned battery has been received and fully inspected at our facility. Please reference your warranty claim ticket provided by customer service via email when contacting our customer service team at [email protected].
15. Limitation of Damages
In no event shall BigBattery be liable for any consequential, incidental, or special damages arising out of or related to any breach of this warranty.
16. Warranty Details
● 12-Year1 Repair/Replacement Warranty Coverage Details: BigBattery guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years1 from the date of purchase, automatically registered upon purchase. This warranty is extended exclusively to the original purchaser for the entire 12-year1 duration.
● Our batteries are engineered to operate for a minimum of 12 years1 with zero maintenance required. Depending on the model, usage, and environmental conditions, some batteries may last up to 22 years.
● BigBattery batteries are also warranted to maintain a reasonable capacity over time (refer to exclusions for specific limits). In the event of a diminished capacity claim, customers may return the battery for capacity testing. We will conduct a comprehensive bench test and provide a full cycle test report. If the battery’s capacity is found to be below the limits specified in the exclusions section, it will qualify for warranty service. Customers will not incur any costs for the testing, regardless of the results.
● Under this 12-Year (1) Warranty, BigBattery will repair or replace any part proven to be defective in material or workmanship. All warranty repairs and services must be conducted by an authorized BigBattery technician or at an authorized BigBattery service facility unless directed otherwise in writing by a BigBattery representative. If repair is not possible, BigBattery may replace the defective product with a refurbished product of similar capacity which was designed for the same application. If the customer prefers a new product, or if a refurbished product is not available, BigBattery may, at its sole discretion, provide a new product of similar capacity. In such case, beginning in the second year of the warranty, the customer will be responsible for one-twelfth (1/12) of the cost of a new product for each year of ownership.
(1) Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and batteries purchased after Oct 2024 have a 12 year warranty.
● For the first year, the expenses related to returning and repairing a defective part will be assumed by BigBattery within the continental US, including pickup, return shipping, repair, replacement, and final shipping if the battery is under warranty. This warranty does not assume responsibility for disconnection, service interruption, or re-packing expenses per said return shipment. Customers with international warranty claims will need to cover the cost of shipping.
● Defective Parts Return: For the first year, BigBattery will cover all expenses related to the return, repair, or replacement of a defective part within the continental United States, including pickup, shipping, repair, replacement, and return shipping to the customer if the battery is under warranty. After the first year, the customer can either pay for shipping or arrange their own shipping to and from BigBattery. This warranty does not cover costs related to customers’ disconnection, service interruption, or re-packing. Customers with international warranty claims (outside of the USA) are responsible for covering shipping costs to BigBattery. All returns should be shipped to our RMA HQ with proper paperwork included:
Return Address
BigBattery
400 Maple St.
Commerce, TX 75428
17. Warranty Exclusions
This warranty does not cover any costs, repairs, shipping, or services for the following:
A. Damage resulting from misuse, abuse, accidents, alterations, use beyond the intended application, collision, dropping, or improper installation.
B. Use of the product outside of specified conditions or using a product undersized for the application.
C. Corrective work required due to repairs performed by anyone other than an authorized BigBattery technician, unless previously approved by BigBattery Tech Support.
D. Environmental damage, including exposure to caustic substances, saltwater, or outdoor elements, unless the battery is specifically indicated for outdoor use on the product label, specification sheet, or user manual.
E. Claims of diminished capacity that are less than 25% within the 12 year1 warranty period.
F. Improper charging, discharging, or storage, including over-discharging. If the battery is discharged below 10%, charge the battery within 48 hours. Allowing the battery to remain in a low charged state may cause permanent damage which will void the warranty. During long term storage, it is recommended to charge the battery to at least 80%, turn off or disconnect the battery to ensure there are no parasitic loads, 1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
and check the charge levels every 30 days. If you are unable to charge the battery, contact BigBattery immediately to avoid voiding the warranty due to over-discharge damage.
G. On-site service calls from third parties.
Warning: The warranty will be void if the battery is opened, disassembled, or improperly altered unless explicitly directed by BigBattery for technical support.
18. Accessories
BigBattery provides a limited warranty for all BigBattery accessories sold through our company, including but not limited to BigBattery chargers. This does not include products branded by another manufacturer, which are covered in Section 19. The BigBattery accessory warranty covers any defects in material or workmanship under normal use for a period of one (1) year from the date of purchase. During the warranty period, BigBattery will repair or replace, at no charge, products or parts that prove defective due to improper material or workmanship under normal use and maintenance.
Warranty Coverage Conditions:
A. The warranty is valid only if the product is used properly with the compatible BigBattery products.
B. Any modification, misuse, or improper installation voids this warranty.
C. This warranty does not cover normal wear and tear or damage caused by accidents, negligence, or unauthorized modifications.
For warranty claims, proof of purchase is required, and the customer must contact BigBattery customer service at [email protected] for further instructions.
19. Non-BigBattery Branded Products
Non-BigBattery branded products sold by BigBattery are covered exclusively by the original manufacturer’s warranty. The warranty terms and conditions for these products can be found on the respective product pages or by contacting our customer support team. BigBattery offers technical support for all products BigBattery sells.
Important Notes:
A. BigBattery does not extend or modify the warranty terms provided by the original manufacturer.
B. Any warranty claims, service, or support for these products must be directed to the original manufacturer as per their specified terms and conditions.
C. Customers are encouraged to review the manufacturer’s warranty policies to fully understand coverage, exclusions, and claim processes. For assistance in locating the manufacturer’s warranty details or for further inquiries, please reach out to our customer support team. 1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
20. Warranty Claims Process
To start a warranty repair or replacement, contact BigBattery Tech Support to confirm the issue and find a solution with our team. If your battery needs to be returned for repair or replacement, customer service will help arrange shipping to and from our repair facility. Please pack the battery securely, preferably in the original packaging, and include a copy of your original purchase receipt with detailed notes about the issue. Follow the packing instructions provided by customer service ([email protected] / (818) 280-3091). We record all communications to ensure a quick resolution. If BigBattery arranges the shipping, we take responsibility for the safe transportation of your battery to and from our repair facility:
Return Address
BigBattery
400 Maple St.
Commerce, TX 75428
21. Return Packing Instructions
Customers must take pictures of the product(s) being returned prior to packing and email these pictures to [email protected]. These pictures allow BigBattery to hold the logistics provider responsible for any potential damages that could occur during transit.
Please safely pack your returned battery. Logistics carriers DO NOT accept liability for unsafely packed batteries during transit. To prevent damage, use the original box and foam inserts provided. If the original packaging is not available, pack your product in a similarly safe and secure format, using a box or pallet for delivery to our repair center.
BigBattery assumes full responsibility for returning your repaired and/or replaced batteries to you. Transit will occur between your physical address and our authorized service center located at 400 Maple St. Commerce, TX 75428.
22. Legal
This warranty shall be governed by and interpreted in accordance with the laws of the state of Texas. No employee or representative of the manufacturer is authorized to provide any warranty in addition to the terms outlined within this agreement.
1 Batteries purchased before Oct 2021 have a 3 year warranty, Batteries purchased from Oct 2021 – Oct 2024 have a 10 year warranty, and
batteries purchased after Oct 2024 have a 12 year warranty.
Product FAQs
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