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48V LiFePO₄ Battery · 14.3kWh · IP65 All-Weather
The EG4 280Ah All-Weather battery banks 14.3kWh of LiFePO₄ storage behind a 200A continuous discharge rating, sealed inside an IP65 enclosure rated for direct outdoor installation. It's the storage half of a system — pair it with a compatible EG4 or BigBattery inverter — backed by integrated self-heating, dual fire arrestors, an emergency stop, and a 10-year manufacturer's warranty.
High-density lithium iron phosphate storage in a single wall-mount module, sized to cover a serious chunk of a home's daily use.
Delivers up to 10,240W continuously (200A for 30 minutes at peak), enough for demanding residential loads.
Rated for 8,000+ charge cycles at 80% depth of discharge — years of daily cycling before capacity meaningfully fades.
Internal heating elements keep the cells within charge and discharge range through cold snaps, protecting both performance and lifespan.
Sealed against rain, dust, and outdoor exposure, so it doesn't need a dedicated climate-controlled equipment room.
Built-in fire arrestors and a manual emergency stop add a physical layer of safety on top of standard BMS protections.
Included as part of the battery's build to help guard the internal electronics against certain electromagnetic disturbances.
An onboard LCD shows real-time BMS status, and quick-connect terminals simplify both first install and later expansion.
This battery doesn't do anything on its own — it needs a compatible inverter to convert its stored DC power into usable AC electricity. What it brings to that pairing is capacity and durability: 14.3kWh per module, a 200A continuous discharge rating, and a cycle life rated past 8,000 charges at 80% depth of discharge, which works out to years of daily use before capacity meaningfully declines.
The IP65 enclosure and integrated self-heating mean it can go in places an indoor-only battery can't — a garage, a shed, or fully outdoors — while still charging and discharging reliably through cold weather. Dual fire arrestors, a manual E-Stop, and EMP protection layer onto the standard BMS safeguards most lithium batteries already carry, and the whole thing is backed by a 10-year manufacturer's warranty.
| Nominal voltage | 51.2 V |
| Chemistry | LiFePO₄ |
| kWh capacity | 14.3 kWh |
| Ah capacity | 280 Ah |
| Max cont. discharge rate | 10,240 W |
| BMS charging voltage | 56.0V (±0.8V) |
| Rec. charging voltage | 56.2V (±0.2V) |
| Rec. float setting | 54V (±0.2V) |
| Max continuous charge current | 140 A |
| Rec. charge current | 60–140 A |
| Max continuous discharge current | 140A (200A / 30 min) |
| Rec. discharge current | 60–140 A |
| Rec. SoC cutoff | 20% |
| Internal temp cutoffs (heater) | On ≤32°F / Off ≥41°F |
| Protection rating | IP65 (all-weather) |
| Charging temp range | 32–122°F |
| Discharging temp range | -4–131°F |
| Storage temp range | 32–113°F |
| Operating altitude | <16,404 ft |
| Dimensions (D×W×H) | 9.1 × 22.3 × 36.1 in |
| Weight | 308.6 lbs |
| Communications | RS485, CANBus |
| Power consumption (heater) | 224 W |
| Brand / model | EG4 280Ah All-Weather |
| Cycle life | 8,000+ @ 80% DoD |
| Warranty | 10 years |
Certifications: UL1973, UL9540A.
This battery needs a compatible inverter to function — which inverters qualify depends on whether the install is grid-tied (requiring UL 9540 certification) or fully off-grid.
UL 9540 certified + closed-loop comms
Closed-loop comms, non-UL 9540
No — this listing is the battery only. It needs a compatible inverter to convert its stored power into usable electricity; see the compatibility section above for which inverters qualify for grid-tied versus off-grid installs.
Yes — it's IP65-rated with integrated self-heating, built specifically for direct outdoor or unconditioned-space installation, unlike indoor-only batteries.
Grid-tied installations that need UL 9540 energy storage system certification are limited to EG4's 12kPV, 18kPV, FlexBOSS18, and FlexBOSS21 inverters. Fully off-grid installs (not pursuing UL 9540 certification) have a wider range: any BigBattery APEX inverter or EG4 inverter.
It's rated for 8,000+ charge cycles at 80% depth of discharge. Cycled once a day, that works out to well over a decade of service before capacity meaningfully declines, backed by a 10-year manufacturer's warranty regardless.
It's built into the battery as an added protective layer for the internal electronics against certain electromagnetic disturbances. For the specifics of what's shielded and to what standard, the spec sheet and manufacturer are the best source before relying on it for a specific use case.
Given the voltages and currents involved, installation should be handled by a qualified, licensed electrician or solar installer familiar with your local code requirements.
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