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 4.0. The Sol-Ark Limitless 12K-2P-LL costs $50 less ($3,849 vs $3,899).
Sol-Ark Limitless 12K-2P-LL
For homes that want Sol-Ark’s backup and grid-sell features on a smaller budget, usually on a critical-loads panel. Its high idle draw is the main trade-off.
Shop Solar Kits $3,849$3,849
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.
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 | Sol-Ark Limitless 12K-2P-LL |
|---|---|---|
| Overall rating | 4.1/5 | 4.0/5 |
| Value 30% | 62 $390 per kW of continuous output | 63 $385 per kW of continuous output |
| Solar input 20% | 68 15,000 W of panels, 600 V max, 2 MPPTs | 60 12,000 W of panels, 500 V max, 3 MPPTs |
| Efficiency 20% | 63 94% peak efficiency, 70 W idle | 50 96 W idle |
| Features 15% | 100 UL 1741 listed, Wi-Fi app, parallel stacking, grid sell-back, generator input, battery communication | 100 UL 1741 listed, Wi-Fi app, parallel stacking, grid sell-back, generator input, battery communication |
| Warranty 15% | 100 10-year warranty | 100 10-year warranty |
Specifications
| Fortress Power Envy 10K | Sol-Ark Limitless 12K-2P-LL | |
|---|---|---|
| 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 | 24,000 W |
| Peak efficiency | 94% | - |
| Max efficiency | - | 97.6% |
| CEC efficiency | 96.5% | - |
| Idle draw | 70 W | 96 W |
| Transfer time | 20 ms | 5 ms |
| Parallel units | Up to 10 units | Up to 12 units |
| Solar | ||
| Max PV power | 15,000 W | 12,000 W |
| Max PV voltage (Voc) | 600 V | 500 V |
| MPPT range | 210 to 500 V | 150 to 425 V |
| MPPT trackers | 2 | 3 |
| PV current per tracker | 25 A | 32 A |
| Runs without battery | Yes | - |
| Battery and grid | ||
| Battery voltage | 48 V | 48 V |
| Battery types | Lithium, lead-acid | Lithium, lead-acid |
| Max charge current | 210 A | 220 A |
| Battery communication | Yes | Yes |
| Grid sell-back | Yes | Yes |
| Generator input | Yes | Yes |
| UL 1741 | UL 1741 SB | UL 1741 SB |
| Build | ||
| App monitoring | Included | Included |
| Enclosure | IP65 (NEMA 4X) | IP65 / NEMA 3R |
| Dimensions | 29.5 x 20.5 x 11.23 in | 25.7 x 16.59 x 9.8 in |
| Weight | 110 lb | 65 lb |
| Warranty | 10 years | 10 years |
| Released | 2023-06 | 2026-06 |