EG4 FlexBOSS21
For grid-tied homes that want whole-house backup and a big solar array from one inverter. It gives more output than the 18kPV for less money.
Signature Solar $3,599.99$3,599.99
6 EG4 Electronics hybrid inverters ranked. Each one is scored and ranked against every brand in its output, so "#3 mid-size" means third of all mid-size hybrid inverters here, not third among EG4 Electronics's own.
EG4 Electronics makes 6 current hybrid inverters: 6 120/240 V split-phase. Prices run from $1,499.99 for the EG4 6000XP to $3,999.99 for the EG4 18kPV. Its best-rated model: the EG4 FlexBOSS21 (#2 of 40 120/240 V split-phase, rated 4.4). Models put out 6 to 12 kW. 6 of them are UL 1741 listed.
Prices were last checked October 23, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
EG4 Electronics hybrid inverters 6
- EG4 FlexBOSS21#2 120/240 V split-phaseFull review
For grid-tied homes that want whole-house backup and a big solar array from one inverter. It gives more output than the 18kPV for less money.
Signature Solar $3,599.99$3,599.9912 kW48 V21,000 W10 years - EG4 FlexBOSS18#3 120/240 V split-phaseFull review
For grid-tied homes that want net metering and whole-home backup at a lower price than the FlexBOSS21. Choose the 21 if you need more battery-only output or a third tracker.
Signature Solar $3,199.99$3,199.9910 kW48 V18,000 W10 years - EG4 18kPV#5 120/240 V split-phaseFull review
For grid-tied homes that want whole-house backup and grid sell from one proven inverter. Compare against the FlexBOSS21 first, which costs less for more power.
Signature Solar $3,999.99 Shop Solar Kits $3,999.99$3,999.9912 kW48 V18,000 W10 years - EG4 12kPV#7 120/240 V split-phaseFull review
For grid-tied homes that want battery backup and net metering from a mid-size inverter. Pay the premium over the XP line only if you need grid sell or an outdoor install.
Signature Solar $2,999.99 Shop Solar Kits $2,999.99$2,999.998 kW48 V12,000 W10 years - EG4 12000XP#10 120/240 V split-phaseFull review
For off-grid homes that need whole-house 240 V power and a big solar array at a low price per kW. Grid-tied owners who want to sell power should look at a hybrid instead.
Signature Solar $2,099.99 Shop Solar Kits $2,099.99$2,099.9912 kW48 V24,000 W5 years - EG4 6000XP#20 120/240 V split-phaseFull review
For off-grid homes and cabins that need 240 V at a low price per kW. It does the job of two 120 V inverters in one box, but can’t export to the grid.
Signature Solar $1,499.99 Shop Solar Kits $1,499.99$1,499.996 kW48 V8,000 W5 years
