The EG4 WallMount Indoor 314Ah is the better 48V solar battery overall, rated 4.5 to 4.4. The EG4 WallMount Indoor 314Ah leads on features and output. The EG4 WallMount Indoor 280Ah wins on value. The EG4 WallMount Indoor 280Ah costs $1,039.99 less ($2,700 vs $3,739.99).
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 $3,739.99A 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.
Signature Solar $2,700Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every wall and floor mount 48V solar battery; a clear win is highlighted. How we rank explains each one.
| Factor weight | EG4 WallMount Indoor 314Ah | EG4 WallMount Indoor 280Ah |
|---|---|---|
| Overall rating | 4.5/5 | 4.4/5 |
| Value 35% | 81 $234 per rated kWh | 91 $189 per rated kWh |
| Output 15% | 49 200 A continuous (about 10.2 kW) | 29 140 A continuous (about 7.2 kW) |
| Warranty 15% | 100 10-year warranty | 100 10-year warranty |
| Safety listing 15% | 100 UL 1973, UL 9540 listed | 100 UL 1973, UL 9540 listed |
| Cycle life 10% | 100 10,000 cycles at 80% depth, maker rating | 100 8,000 cycles at 80% depth, maker rating |
| Features 10% | 100 inverter communication, self-heating, app | 70 inverter communication, self-heating; no app |
| EG4 WallMount Indoor 314Ah | EG4 WallMount Indoor 280Ah | |
|---|---|---|
| Capacity | ||
| Case | Wall or floor mount | Wall or floor mount |
| Nominal voltage | 51.2 V | 51.2 V |
| Capacity | 314 Ah | 280 Ah |
| Energy | 16 kWh | 14.3 kWh |
| Usable energy | 12.9 kWh | - |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 10,000 at 80% depth | 8,000 at 80% depth |
| Power | ||
| Continuous discharge | 200 A | 140 A |
| Peak discharge | - | 200 A |
| Max charge current | 157 A | 140 A |
| Modules in parallel | Up to 32 | Up to 64 |
| Safety and communication | ||
| UL 1973 | Yes | Yes |
| UL 9540A | Yes | Yes |
| UL 9540 | Yes | Yes |
| Communication | CAN, RS485 | CAN, RS485 |
| Works with inverters | EG4, Growatt, Deye, Megarevo, Luxpower, Victron, Solis, SMA, Schneider, Voltronic | EG4, Schneider, Sol-Ark, Victron, Growatt, Megarevo, Luxpower, Deye |
| Self-heating | Yes | Yes |
| App | Yes | No |
| Build | ||
| Display | No | Yes |
| Built-in breaker | Yes | Yes |
| Enclosure | IP20 | IP20 |
| Dimensions | 34.1 x 18.1 x 9.6 in (865 x 460 x 245 mm) | 34.1 x 18.1 x 10.4 in (865 x 460 x 264 mm) |
| Weight | 293.2 lb | 286.6 lb |
| Warranty | 10 years | 10 years |
| Released | 2025-11 | 2024-04 |
