Product Description

The BigBattery ETHOS is a stackable 48V LiFePO4 home battery system. This configuration includes three 5.12 kWh modules — approximately 15.36 kWh of storage in a single tower — and carries UL1973 and UL9540A safety listings for residential energy storage. The tower design lets you add modules as your needs grow, and ETHOS is the battery platform used across BigBattery's home ESS kits with EG4 18kPV, FlexBOSS, and XP-series inverters.

Why the ETHOS

  • Safety-certified for home installation: UL1973-listed cells and UL9540A-tested design — the certifications building departments look for when permitting residential energy storage
  • Stackable tower design: modules stack vertically in one column, keeping the footprint small and the wiring clean
  • Grow in 5.12 kWh steps: start with this 3-module tower and add modules as your consumption grows — no need to buy maximum capacity up front
  • LiFePO4 chemistry with a built-in battery management system (BMS) in every module
  • Broad compatibility with 48V hybrid and off-grid inverters, with closed-loop communications on compatible models

Who it's for

Homeowners adding storage to a solar system or building backup power — especially where permits require UL-listed equipment or where floor space is tight. For complete pre-matched systems, see the ETHOS kits with EG4 18kPV, FlexBOSS18, FlexBOSS21, 6000XP, and 12000XP V2 inverters.

Specifications

Configuration 3 × 5.12 kWh modules — ~15.36 kWh total
Nominal voltage 48V
Chemistry LiFePO4 (lithium iron phosphate)
Certifications UL1973; UL9540A
Protection Built-in BMS per module
Expandability Stack additional modules as needs grow
Compatibility 48V hybrid and off-grid inverters
SKU K0950

Warranty & support

Covered by BigBattery's 12-year manufacturer warranty, backed by lifetime USA-based technical support.

Common questions

Why do the UL listings matter?

Many building departments require UL1973/UL9540A documentation to permit a residential battery installation. ETHOS carries both, which can make the difference between a smooth inspection and a rejected system.

Which inverter should I pair it with?

Any compatible 48V hybrid or off-grid inverter. For matched systems with communications configured, see our ETHOS kits with EG4 18kPV, FlexBOSS18/21, 6000XP, and 12000XP V2.

Can I expand later?

Yes — that's the point of the platform. Add modules to the tower as your storage needs grow.

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