Fortress Power Hybrid Inverters Ranked

Last updated: October 24, 2026

5 Fortress Power 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 Fortress Power's own.

Fortress Power makes 5 current hybrid inverters: 5 120/240 V split-phase. Prices run from $1,549 for the Fortress Power Solo 6.5K to $4,898 for the Fortress Power Envy True 12. Its best-rated model: the Fortress Power Envy Duo 21 (#4 of 40 120/240 V split-phase, rated 4.3). Models put out 6.5 to 12 kW. 5 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.

Fortress Power hybrid inverters 5

  1. Fortress Power Envy Duo 21
    #4 120/240 V split-phase4.3Full review

    For homes with a large roof array that want whole-house backup and grid export from one outdoor unit. It takes more solar than the Envy True 12 for the same price.

    Wind & Sun $4,898
    $4,898
    12 kW48 V25,000 W10 years
  2. Fortress Power Envy True 12
    #6 120/240 V split-phase4.2Full review

    For grid-tied or off-grid homes that want one outdoor inverter to back up the whole house and export to the grid, with US-based support.

    Current Connected $4,898 Wind & Sun $4,898
    $4,898
    12 kW48 V21,000 W10 years
  3. Fortress Power Envy 10K
    #11 120/240 V split-phase4.1Full review

    For grid-tied homes that want an outdoor hybrid with export, backup and US-based support at a lower price than the Envy True 12.

    Wind & Sun $3,899
    $3,899
    10 kW48 V15,000 W10 years
  4. Fortress Power Solo 6.5K
    #16 120/240 V split-phase4.0Full review

    For off-grid cabins, ADUs and backup systems that want 240 V and a large solar input from a US-supported brand. It costs a little more than the EG4 6000XP.

    Current Connected $1,549 Wind & Sun $1,549
    $1,549
    6.5 kW48 V10,000 W5 years
  5. Fortress Power Envy 8K
    #17 120/240 V split-phase4.0Full review

    For grid-tied homes with moderate backup needs that want an outdoor hybrid with export and US-based support.

    Wind & Sun $3,735
    $3,735
    8 kW48 V13,000 W10 years

Every hybrid solar inverter ranked