EG4 Backup Power
EG4 has 1 unit on Outage Geek, priced from $3,300 to $3,300. The highest-rated EG4 pick is the EG4 PowerPro WallMount All Weather at 4.8★. Compare the full lineup below.
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. diysolarforum threads are full of multi-unit builds - it parallels to 85.8kWh - and long-term owner reports are strongly positive: 8,000-cycle rating, self-heating below freezing, and 200A continuous discharge. The honest 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.