BigBattery
BigBattery ETHOS 15.36kWh Grid-Tied Battery & Inverter Kit — 3 ETHOS Batteries + 1 EG4 FlexBOSS18 Hybrid Inverter
BigBattery ETHOS 15.36kWh Grid-Tied Battery & Inverter Kit — 3 ETHOS Batteries + 1 EG4 FlexBOSS18 Hybrid Inverter
SKU: K0231
- Regular price
- $6,667.49
- Regular price
- $7,875.00
- Sale price
- $6,667.49
- Unit price
- per
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- Warranty information is listed in this product's details.
Store your solar, cover essential loads and stay ready for the next outage.
This clearly defined kit pairs 15.36kWh of nominal storage in 3 modular ETHOS batteries with the EG4 FlexBOSS18. It gives homeowners and installers a practical foundation for solar self-consumption, backup planning and permitted grid interaction—without forcing the buyer to decode the battery and inverter quantities.
Why it earns a closer look
Useful capability, explained in buying language.
Storage sized to the project
15.36kWh of nominal capacity gives the installer a concrete starting point for load and runtime planning.
AC output capability
10kW battery / up to 13kW with PV from the EG4 FlexBOSS18, with operating limits stated separately from battery capacity.
Modular storage that stays organized
ETHOS modules, a control box and the manufacturer-listed stack hardware create a purpose-built battery bank rather than a loose collection of parts.
Use solar on your terms
Compatible hybrid operation can prioritize self-consumption, backup and permitted grid interaction after commissioning.
Where it fits
- Residential solar self-consumption and time-of-use planning
- Whole-home or essential-load backup designed by a qualified installer
- New or retrofit hybrid systems using the exact documented battery and inverter models
System-fit guidance
The configured battery-bank continuous rating meets or exceeds the combined inverter battery-powered rating; final conductor, protection and surge design still requires engineering review. Grid-tied, hybrid or off-grid operation when configured and permitted correctly
What’s included
- 3 × BigBattery ETHOS Batteries
- 1 × EG4 FlexBOSS18 Hybrid Inverter
- 1 × ETHOS control box
- 1 × ETHOS base
- Manufacturer-listed ETHOS communications, parallel and final positive/negative cable set for this stack size
Typically still required
- Solar panels and array racking
- Permitting, utility interconnection and installation labor
- Site-specific conductors, conduit, disconnects, overcurrent protection and grounding unless itemized in a written order confirmation
Frequently asked questions
What exactly comes in this kit?
Are solar panels included?
How long will 15.36kWh run my loads?
Can this system sell power back to the grid?
Is the complete kit UL 9540 certified?
What warranty applies?
Know what arrives—and what the installation still needs.
Send Torven Power your loads, existing equipment and project goals for pre-purchase fit guidance.
Specifications, images and package contents can change by hardware revision. The delivered model label, current manual, written warranty and permitted design control.
Product Data
Technical Specifications
System Summary
| Product SKU | K0231 |
|---|---|
| System type | Grid-tied / hybrid battery and inverter kit |
| Nominal battery voltage class | 51.2V / 48V-class |
| Total nominal storage | 15.36kWh |
| Battery configuration | 3 × BigBattery ETHOS Batteries |
| Inverter configuration | 1 × EG4 FlexBOSS18 Hybrid Inverter |
| Configured battery-bank continuous rating | 12.8kW |
| Combined inverter battery-powered rating | 10kW |
| Power-sizing note | The configured battery-bank continuous rating meets or exceeds the combined inverter battery-powered rating; final conductor, protection and surge design still requires engineering review. |
| AC topology | 120/240V split phase |
| Operating mode | Grid-tied, hybrid or off-grid operation when configured and permitted correctly |
| Solar panels included | No |
| Certification scope | Do not claim system-level UL 9540 without a current certificate matching the exact battery model, inverter model, quantities, firmware and installation. |
Battery System Specifications
| Battery family | BigBattery ETHOS LiFePO4 modular battery system |
|---|---|
| Battery modules | 3 × 51.2V 100Ah ETHOS modules |
| Capacity per module | 5.12kWh |
| Total nominal capacity | 15.36kWh |
| Total nominal amp-hours | 300Ah |
| Continuous discharge rating | 250A / 12.8kW at the configured bank size |
| Communications | CAN and RS485 through the ETHOS control box |
| Protection | Integrated battery management and fire-suppression features |
| Enclosure | IP65 / NEMA 4X |
| Charge temperature | 32°F to 113°F |
| Discharge temperature | -4°F to 140°F |
| Approximate configured battery-system weight | 387 lb |
| Battery warranty | 12-year limited warranty; current written terms control |
Inverter Specifications
| Inverter model | EG4 FlexBOSS18 hybrid inverter |
|---|---|
| Battery-powered AC output | 10kW |
| PV-assisted AC output | Up to 13kW |
| AC topology | 120/240V split phase |
| Recommended PV array | 18kW |
| MPPT channels | 2 |
| Maximum PV input voltage | 600V |
| AC pass-through | 90A |
| Maximum battery current | 208A |
| Enclosure | NEMA 4X |
| Weight | 115 lb |
| Inverter warranty | 10-year limited warranty; current written terms control |
Included Components
| Verified item 1 | 3 × BigBattery ETHOS Batteries |
|---|---|
| Verified item 2 | 1 × EG4 FlexBOSS18 Hybrid Inverter |
| Verified item 3 | 1 × ETHOS control box |
| Verified item 4 | 1 × ETHOS base |
| Verified item 5 | Manufacturer-listed ETHOS communications, parallel and final positive/negative cable set for this stack size |
| Not included 1 | Solar panels and array racking |
| Not included 2 | Permitting, utility interconnection and installation labor |
| Not included 3 | Site-specific conductors, conduit, disconnects, overcurrent protection and grounding unless itemized in a written order confirmation |
| Confirmation needed 1 | ETHOS grounding cable is not listed as included and must be planned separately. |
Verify the delivered model and hardware revision against the current manual and installation requirements.
Why Buy From Us
Shop with confidence at Torven Power.
Clear policies and real support before and after your purchase.
Ordering Information
Shipping & Returns
Shipping: BigBattery batteries, inverters, panels and kits may ship by parcel or LTL freight. Stock, lead time, residential delivery, liftgate service and remote-area charges can vary. Checkout terms or Torven Power’s written order confirmation control.
Returns: Eligibility depends on timing, product condition, installed or energized status, freight costs, supplier authorization and product-specific exclusions. Review the current policies before ordering.
Review the Shipping Policy and Return & Refund Policy before purchase.
BigBattery
BigBattery ETHOS 15.36kWh Grid-Tied Battery & Inverter Kit — 3 ETHOS Batteries + 1 EG4 FlexBOSS18 Hybrid Inverter
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