Fortress Power Envy 10K
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
The Fortress Power Envy 10K is the better hybrid solar inverter overall, rated 4.1 to 3.6. The Fortress Power Envy 10K leads on warranty, features and solar input. The ECO-WORTHY Liber 10KP wins on value. The ECO-WORTHY Liber 10KP costs $2,389.01 less ($1,509.99 vs $3,899).
ECO-WORTHY Liber 10KP
For off-grid homes that want 10 kW of split-phase power and a big solar array at a low price per kW. It shares its hardware with SRNE’s ASP 10 kW.
Amazon ECO-WORTHY $1,509.99$1,509.99
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.
Which should you buy?
- Choose the Fortress Power Envy 10K for warranty (10-year warranty vs 2-year warranty), features (UL 1741 listed, Wi-Fi app, parallel stacking, grid sell-back, generator input, battery communication vs UL 1741 listed, Wi-Fi app, parallel stacking; no grid sell-back) and solar input (15,000 W of panels, 600 V max, 2 MPPTs vs 11,000 W of panels, 500 V max, 2 MPPTs).
- Choose the ECO-WORTHY Liber 10KP for value ($151 per kW of continuous output vs $390 per kW of continuous output).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 120/240 V split-phase hybrid solar inverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Fortress Power Envy 10K | ECO-WORTHY Liber 10KP |
|---|---|---|
| Overall rating | 4.1/5 | 3.6/5 |
| Value 30% | 62 $390 per kW of continuous output | 100 $151 per kW of continuous output |
| Solar input 20% | 68 15,000 W of panels, 600 V max, 2 MPPTs | 48 11,000 W of panels, 500 V max, 2 MPPTs |
| Efficiency 20% | 63 94% peak efficiency, 70 W idle | 38 92% peak efficiency |
| Features 15% | 100 UL 1741 listed, Wi-Fi app, parallel stacking, grid sell-back, generator input, battery communication | 70 UL 1741 listed, Wi-Fi app, parallel stacking; no grid sell-back |
| Warranty 15% | 100 10-year warranty | 11 2-year warranty |
Specifications
| Fortress Power Envy 10K | ECO-WORTHY Liber 10KP | |
|---|---|---|
| Output | ||
| Output voltage | 120/240 V split-phase | 120/240 V split-phase |
| Continuous output | 10,000 W | 10,000 W |
| Surge | 20,000 W | 20,000 W |
| Peak efficiency | 94% | 92% |
| CEC efficiency | 96.5% | - |
| Idle draw | 70 W | - |
| Transfer time | 20 ms | 10 ms |
| Parallel units | Up to 10 units | Up to 6 units |
| Solar | ||
| Max PV power | 15,000 W | 11,000 W |
| Max PV voltage (Voc) | 600 V | 500 V |
| MPPT range | 210 to 500 V | 125 to 425 V |
| MPPT trackers | 2 | 2 |
| PV current per tracker | 25 A | 22 A |
| Runs without battery | Yes | Yes |
| Battery and grid | ||
| Battery voltage | 48 V | 48 V |
| Battery types | Lithium, lead-acid | Lithium-ion, lead-acid, user-defined |
| Max charge current | 210 A | 200 A |
| AC charge current | - | 120 A |
| Battery communication | Yes | - |
| Grid sell-back | Yes | No |
| Generator input | Yes | No |
| UL 1741 | UL 1741 SB | Yes |
| Build | ||
| App monitoring | Included | Included |
| Enclosure | IP65 (NEMA 4X) | IP20 |
| Dimensions | 29.5 x 20.5 x 11.23 in | 620 x 445 x 130 mm |
| Weight | 110 lb | 59.5 lb |
| Warranty | 10 years | 2 years |
| Released | 2023-06 | 2026-03 |