Description
BigBattery 12kW 15.3kWh ETHOS Energy Storage System (ESS)
BigBattery’s 48V ETHOS systems are here, and this 15kWh indoor configuration is the ideal solution for grid-tied power in your tiny home, cabin, or family home, supported by comprehensive safety, reliability, and state-of-the-art features.
The ETHOS System was built to be a versatile home power solution, with a stackable, modular design for easy expandability, and all hardware included to mount your ETHOS to your wall with an effortless installation. The ETHOS comes equipped with an IP65-rated casing, an internal fire suppression system, as well as an advanced BMS with auto cell-balancing to ensure long-lasting safety and reliability. Plus, its control box features an interactive LED display, along with CANBus and RS485 communication protocols, so you can always monitor the status and performance of your power.
But that’s not all. We pair our ETHOS with a cutting-edge 12000W EG4 hybrid inverter, which features its own LCD touch screen display, 3 MPPT inputs, an integrated UPS module for seamless on and off-grid switching, and the ability to handle PV arrays of up to 18000W. Plus, through its smart load control, AC coupling abilities, and peak shaving function, you can meet your power needs and protect your home against unstable grids or rolling blackouts, while seeing huge savings each month on your electric bill.
Whether you’re looking to ensure emergency backup power is always available, or you’re looking to outfit your home with a powerful solar system, the ETHOS ensures reliable, efficient power delivery day in and day out, allowing you to save on utilities, or get rewarded for giving back to the grid through net metering programs and other tax incentives. Take control of your home’s power and shop the 48V ETHOS today.
Included Components
- 3 × 48V ETHOS 5.12kWh Stackable Battery Module (FETHS-48051-G1)
- 1 × ETHOS Control Box (CNT060)
-
1 × EG4 12kW (18kPV) Hybrid Inverter
- 1 × 15kWh Ethos Controller to Battery Power Cable 4ft (1220mm) (CBL091)
Designed For 48V Applications
- RESIDENTIAL POWER SYSTEMS
- HOME SOLAR SYSTEMS
- CABINS & TINY HOMES
- FAMILY HOMES & MANSIONS
- OFF-GRID HOMESTEADS
- EMERGENCY POWER
- WHOLE HOME BACKUP
- LEAD ACID REPLACEMENT
VIDEOS
Product Specifications
BigBattery 12kW 15.3kWh ETHOS Energy Storage System (ESS) Product Specifications
| SKU: | K0955 |
| GTIN-12 (U.P.C.): | 850061252098 |
| System Voltage: | 48V |
| Nominal Voltage: | 51.2V |
| Chemistry: | LiFePO4 |
| kWh Capacity: | 15.36kWh |
| Ah Capacity: | 300Ah |
| Charging Voltage Range: | 55.6 – 57V |
| Max Charge Voltage: | 57V |
| Operating Voltage Range: | 48 – 57V |
| Suggested Low Voltage Cutoff: | 48 – 50.8V |
| BMS Cutoff Range: | 42 – 47V |
| Cell Configuration: | 16S 3P |
| Max Continuous Discharge Current: | 250A |
| Max Continuous Power: | 12800W |
| Max Discharge Peak Current: | 300A (Max 5 seconds) |
| Max Charge Current: | 200A |
| Charge Temperature Range: | 32°F – 113°F (0°C – 45°C) |
| Discharge Temperature Range: | -4°F – 140°F (-20°C – 60°C) |
| Optimal Discharge Temperature Range: | 59°F – 95°F (15°C – 35°C) |
| Storage Temperature Range (SoC >50%): | -4°F – 113°F (-20°C – 45°C) (Max 6 months) |
| Weight: | 387 lb (175.5 kg) |
| Depth: | 6.7 in (170 mm) |
| Width: | 26.5 in (674 mm) |
| Height: | 59.8 in (1520 mm) |
| Max Connections: | Up to (16) parallel connections per control box |
| Protection Rating: | IP65 |
| Communications: | CANBus / RS485 |
Product Manual
BigBattery 12kW 15.3kWh ETHOS Energy Storage System (ESS) Product Manual
| Spec Sheet Download: | Click Here |
| User Manual Download: | Click Here |
| UL9540 Certification Download: | Click Here |
| UL1973 Certification Download: | Click Here |
| Safety Data Sheet Download: | Click Here |
| View Our CEC Listing: | Click Here |
Inverter Downloads
| Spec Sheet: | Click Here |
| User Manual: | Click Here |
| Rapid Shut Down Wiring Guide: | Click Here |
| UL1741 Certificate: | Click Here |
Product Warranty
BigBattery Warranty
In the unlikely event you are having an issue with one of our batteries, we have developed a
straightforward Warranty & Return Policy servicing all customers in the USA:
-
Real (10) Year Warranty
All our batteries come with a10-Year Full Repair/Replacement Warranty. If our batteries malfunction
due to component or manufacturing error, the product will be repaired or replaced free of charge. -
Full Lifetime Tech Support & Customer Service
All batteries include aFree Lifetime Technical Support & Troubleshooting Service. If you have any
questions or need any help, simply call us at+1 (818) 280-3091from9am – 5pm,Monday – Friday, or
send us an email anytime [email protected]. -
Free Repair & Replacement
All batteries are built to last a minimum of 10 years. We stand by the quality of our batteries. If any parts within our battery fail due to defects or manufacturing error within the next 10 years,we will fix or replace your battery free of charge. In addition, for the first year of the warranty we will even cover all shipping costs from/to your purchase address within the continental US.
-
Highest Quality Guarantee
BigBattery utilizes Tier 1 cells to provide the highest quality lithium battery packs in the USA. Depending on themodel, use case and environment, your battery is designed to last between3,500 – 8,000 cycleswhen used as intended within our published battery specifications.
-
Covered Products
This Warranty coversall battery packsfrom the “Date Of Purchase” from BigBattery for 10 years and
all accessoriesincluded for 30 Days. -
Automated Warranty Registration
No warranty registration is needed. Warranties are automatically recorded via an internal customer
database via serial number and QR code. -
Product Manuals & Specification Sheets
BigBattery provides a proprietary QR code on every battery. Scan this QR code with any phone to view
theProduct ManualandProduct Spec Sheetfor your specific battery model. Providing these documents
to you in a digital format helps to protect our environment and provides you the most updated information
on your product in real time. -
Domestic Warranty Claim Support
To start a warranty claim, please email us directly at [email protected] to create a 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 has been purchased within a year if the issue being reported to BigBattery, you will be sent a Return Shipping Label at no cost. After the first year, you will have the option to pay for the shipping, or arrange your own shipping back to BigBattery. If the label is provided by BigBattery, please include a copy of this label in the return box or pallet when our 3rd party logistics provider arrives to pickup your return. 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.
-
Returning Accessories
This Warranty includes a 30-Day replacement for all accessories (Anderson connectors, wiring, chargers, etc.)
included with your battery. If product is not defectiveordamaged upon return, refunds will be offered based on
the purchase price of the unit minus a 20% restocking fee. -
Change Your Mind
That’s OK! All our batteries come with a 30-Day money back guarantee.Returns will be subject to a 20% restocking
fee.Call or email customer service for a free shipping return label. -
Non-Transferable
Our Warranty applies to the original owner. If you wish to transfer your Warranty to another party, you can do so
within 30 days of your purchase by sending a Warranty Transfer Request toSup[email protected]. -
Return Hazmat Fee
Due to the shipping regulations of lithium batteries, please note that some battery returns may require special
documentation and packaging, and these instances could encounter extra fees if a customer is attempting to
return a battery not covered by our Repair and Replacement Policy. -
Battery Abuse Disclaimer
This warranty does not cover damages resulting from misuse, abuse, accidents, alterations, or improper charging/
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. -
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. -
Limitation of Damages
In no event shall BigBattery, Inc. be liable for consequential damages due to breach of this Warranty.
-
Customer Satisfaction
If buyers are not satisfied for any reason after speaking with Level 3 Tech Support and/or our Customer Service team,
all original buyers may escalate dispute resolutions to our CTO for review. We aim to put our customers first, resolve
any issues, and ensure that all customers are happy with their purchase from BigBattery.
Rev. March 2023




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