Enphase Backup Power

The modular, reliability-first choice - especially for homes already running Enphase microinverters. Each 5kWh module contains six grid-forming microinverters producing 3.84kW continuous (7.68kW peak for motor starts), and you stack modules to fit the budget. Price shown is typical installed cost per module ($5,000-8,000 depending on region and whether a System Controller is included). The 15-year/6,000-cycle warranty is the longest in the industry by five years, and it's the spec owners cite most when justifying the premium. The criticism is always the same: per-kWh cost runs $1,000-1,600 installed - roughly double a Powerwall 3 - and whole-home backup realistically needs three-plus modules and the IQ System Controller before it starts a heat pump. Owner sentiment on the Enphase app and the no-single-point-of-failure architecture is very positive; sentiment on the final invoice less so.