A cheap per-kWh indoor wall battery for EG4 inverter owners who want 14 kWh blocks with a heater. Buy while stock lasts; the 314Ah model replaces it.
Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.
Every EG4 WallMount 280Ah model we rank, smallest first. Ratings compare each against its own case.
| Model | Capacity | Rating | Price |
|---|---|---|---|
| EG4 WallMount Indoor 280Ah (this one) | 14.3 kWh | 4.4/5 | $2,700 |
| EG4 WallMount All-Weather 280Ah | 14.3 kWh | 4.3/5 | $3,124.99 |
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its case. How we rank explains each one.
| Model number | WM-48-280-IN |
|---|---|
| Capacity | |
| Case | Wall or floor mount |
| Nominal voltage | 51.2 V |
| Capacity | 280 Ah |
| Energy | 14.3 kWh |
| Chemistry | LiFePO4 |
| Cycle life | 8,000 at 80% depth |
| Power | |
| Continuous discharge | 140 A |
| Peak discharge | 200 A |
| Max charge current | 140 A |
| Modules in parallel | Up to 64 |
| Safety and communication | |
| UL 1973 | Yes |
| UL 9540A | Yes |
| UL 9540 | Yes |
| Communication | CAN, RS485 |
| Works with inverters | EG4, Schneider, Sol-Ark, Victron, Growatt, Megarevo, Luxpower, Deye |
| Self-heating | Yes |
| App | No |
| Build | |
| Display | Yes |
| Built-in breaker | Yes |
| Enclosure | IP20 |
| Dimensions | 34.1 x 18.1 x 10.4 in (865 x 460 x 264 mm) |
| Weight | 286.6 lb |
| Warranty | 10 years |
| Released | 2024-04 |
EG4’s current indoor wall battery, for whole-home systems that want large heated 16 kWh blocks. It costs about $100 less than the All-Weather version if the battery can live indoors.
Signature Solar $3,739.99 Current Connected $3,739.99The outdoor pick in EG4’s wall lineup, for owners who want large heated 16 kWh blocks outside the house. It pairs best with EG4 inverters but talks to most major brands.
Signature Solar $3,835 Current Connected $3,835An outdoor-rated 14 kWh wall battery for EG4 inverter owners with no indoor space for storage. Compare it with the 314Ah All-Weather, which costs a little more per unit but less per kWh of extra capacity.
Signature Solar $3,124.99 Current Connected $3,124.99Compare the EG4 WallMount Indoor 280Ah with any other 48V solar battery →
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