EG4 WallMount 314Ah vs 280Ah
The 314Ah is the newer, larger indoor WallMount; the 280Ah is the older model that the maker says is transitioning out of active availability in the…
EG4 WallMount 314Ah IndoorWall-mount LFP battery16 kWh energy51.2 VDC battery314 Ah capacity3 datasheet edges
EG4 WallMount 280Ah IndoorWall-mount LFP battery14.3 kWh @ 25 °C, 100% SOC energy51.2 V battery280 Ah capacity0 datasheet edgesDatasheet scoreboard: 3 lines where both datasheets list a number. It counts who has the bigger (or, for idle draw, smaller) figure; it is not a quality rating and says nothing about reliability.
The short version
The newer 16 kWh pack against the older 14.3 kWh one being phased out in the U.S.
- WallMount 314Ah: You need the highest energy per unit and the newer design.
- WallMount 280Ah: You are adding to an existing 280Ah bank and can still find stock.
The 314Ah is the newer, larger indoor WallMount; the 280Ah is the older model that the maker says is transitioning out of active availability in the U.S. market. If you already have 280Ah batteries and want to expand, the comparison matters; if you are starting fresh, availability will likely decide it.
EG4 WallMount 314Ah vs 280Ah: specs head to head
| Spec | EG4 WallMount 314Ah Indoor | EG4 WallMount 280Ah Indoor |
|---|---|---|
| Model number | WM-48-314-IN-XX / WM48314INXX | not on datasheet |
| Nominal energy | 16 kWh | 14.3 kWh @ 25 °C, 100% SOC |
| Usable energy | 12.86 kWh (80% recommended) | not on datasheet |
| Nominal voltage | 51.2 VDC | 51.2 V |
| Capacity | 314 Ah | 280 Ah |
| Max continuous / recommended charge current | 157 A / 157 A | 140 A (max. continuous) |
| Max continuous / recommended discharge current | 200 A / 157 A | 140 A (max. continuous) |
| Continuous charge / discharge power | 8 / 10.2 kW | not on datasheet |
| Round-trip efficiency | 95% | not on datasheet |
| Max parallel units | 32 | not on datasheet |
| Enclosure rating | IP20 | IP20 |
| Heater power consumption | 448 W | not on datasheet |
| Operating temperature (charging) | 32 – 122 °F (0 – 50 °C) | not on datasheet |
| Warranty (as listed) | 10 years or 10,000 cycles | not on datasheet |
| Weight | 293.2 lbs (133 kg) | 286.6 lbs (130 kg) |
| Dimensions (H×W×D) | 34.1×18.1×9.6 in (865×460×245 mm) | 34.1×18.1×10.4 in (865×460×264 mm) |
| Cycle life | not on datasheet | >8000 cycles, 0.5C, 80% DOD |
Highlighted = the better figure where both datasheets give a number (higher is better, except idle draw). More is not always better: a larger solar input, for example, needs a bigger battery and wiring to use it. Sources: EG4 WallMount 314Ah Indoor datasheet · EG4 WallMount 280Ah Indoor datasheet. Checked September 30, 2026. “Not on datasheet” means the sheet does not list that line, not that the product lacks it.
What the WallMount 314Ah and WallMount 280Ah numbers mean
- Energy: 16 kWh on the 314Ah against 14.3 kWh on the 280Ah.
- Discharge: the 314Ah lists 200 A maximum continuous and 157 A recommended; the 280Ah lists 140 A maximum continuous.
- Cycle life: the 314Ah is rated for 10,000 cycles at 80% depth of discharge ; the 280Ah lists more than 8000 cycles at 0.5C and 80% DoD.
- Weight: 293.2 lbs against 286.6 lbs, so the larger battery is only a little heavier.
- Availability: the 280Ah page carries the maker's note that U.S. availability varies by distributor.
WallMount 314Ah or WallMount 280Ah: who should pick which
Pick the WallMount 314Ah if…
- You need the highest energy per unit and the newer design.
- You are buying new for a system you will expand.
- You want the 10,000-cycle rating.
Pick the WallMount 280Ah if…
- You are adding to an existing 280Ah bank and can still find stock.
- A discharge rating of 140 A per battery is enough for your inverter and loads.
EG4 WallMount 314Ah vs 280Ah: questions people ask
Can I mix 314Ah and 280Ah batteries?
The 314Ah page says it is cross-compatible with other EG4 models and the maker publishes guidance on paralleling both sizes. Read that guidance and your inverter manual before mixing, and have an electrician confirm the design.
Are they both indoor batteries?
Yes, both are listed at IP20, so plan an indoor, dry location.
Specs change with new revisions; check the current datasheets before you buy. Checked 2026-09-30. Next: size a system or compare any two models.