Home Battery System · Battery (LiFePO4)
EG4 PowerPro WallMount All Weather
The DIY community's darling and the reigning value champion of home storage: 14.3kWh of UL9540-listed, heated, IP65 outdoor-rated LiFePO4 for around $3,300 hardware - roughly $230/kWh, a fifth of installed-brand pricing. Price shown is hardware MSRP for the battery alone; you supply the inverter (usually EG4's 18kPV or FlexBOSS21) and either DIY or hire an electrician. Owners commonly build with two or three units (it parallels to 85.8kWh), and owner reports on the hardware are positive. The specs back them up: 8,000-cycle rating, self-heating below freezing, and 200A continuous discharge. The downsides: support is email/forum-grade compared to a dealer network, closed-loop comms with non-EG4 inverters take firmware fiddling, permitting and insurance for self-installs varies by jurisdiction, and 308.6 lbs makes hanging it a genuine engineering project.
10,240 W / 11,520 W surge · up to well pump or a small central AC
- capacity
- 14,340 Wh
- expands to
- 85,800 Wh
- Transfer switch
- transfer-switch ready
Best for DIY and installer-assisted builds chasing maximum storage per dollar with legitimate UL certification.