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 3.2. The Fortress Power Envy 10K leads on warranty, efficiency and solar input.
MPP Solar LVX 12KW WP
A 10 kW outdoor hybrid for whole-home backup with grid sell-back. It is easier to justify if you can find a single unit at a fair price.
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), efficiency (94% peak efficiency, 70 W idle vs 91% peak efficiency, 99.5 W idle) and solar input (15,000 W of panels, 600 V max, 2 MPPTs vs 12,000 W of panels, 600 V max, 2 MPPTs).
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 | MPP Solar LVX 12KW WP |
|---|---|---|
| Overall rating | 4.1/5 | 3.2/5 |
| Value 30% | 62 $390 per kW of continuous output | 50 no current price (neutral score used) |
| Solar input 20% | 68 15,000 W of panels, 600 V max, 2 MPPTs | 52 12,000 W of panels, 600 V max, 2 MPPTs |
| Efficiency 20% | 63 94% peak efficiency, 70 W idle | 30 91% peak efficiency, 99.5 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 | 11 2-year warranty |
Specifications
| Fortress Power Envy 10K | MPP Solar LVX 12KW WP | |
|---|---|---|
| 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 | - |
| Peak efficiency | 94% | 91% |
| CEC efficiency | 96.5% | - |
| Idle draw | 70 W | 99.5 W |
| Transfer time | 20 ms | 15 ms |
| Parallel units | Up to 10 units | Up to 6 units |
| Solar | ||
| Max PV power | 15,000 W | 12,000 W |
| Max PV voltage (Voc) | 600 V | 600 V |
| MPPT range | 210 to 500 V | 120 to 550 V |
| MPPT trackers | 2 | 2 |
| PV current per tracker | 25 A | 18 A |
| Runs without battery | Yes | Yes |
| Battery and grid | ||
| Battery voltage | 48 V | 48 V |
| Battery types | Lithium, lead-acid | Lithium, lead-acid |
| Max charge current | 210 A | 200 A |
| AC charge current | - | 200 A |
| Battery communication | Yes | Yes |
| Grid sell-back | Yes | Yes |
| Generator input | Yes | Yes |
| UL 1741 | UL 1741 SB | Yes |
| Build | ||
| App monitoring | Included | Included |
| Enclosure | IP65 (NEMA 4X) | IP65 |
| Dimensions | 29.5 x 20.5 x 11.23 in | 215.5 x 515 x 715 mm |
| Weight | 110 lb | 104.7 lb |
| Warranty | 10 years | 2 years |
| Released | 2023-06 | 2023-09 |