Fortress Power Envy 8K
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
The Fortress Power Envy 8K is the better hybrid solar inverter overall, rated 4.0 to 3.6. The Fortress Power Envy 8K leads on warranty, features and solar input. The SunGoldPower SPH8048P wins on value. The SunGoldPower SPH8048P costs $2,285 less ($1,450 vs $3,735).
SunGoldPower SPH8048P
A UL-listed 8 kW off-grid split-phase inverter at a low price per kW, for cabins, homes and shops that do not sell to the grid.
Amazon SunGoldPower $1,450$1,450
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 8K for warranty (10-year warranty vs 1-year warranty), features (UL 1741 listed, Wi-Fi app, parallel stacking, grid sell-back, generator input, battery communication vs UL 1741 listed, Wi-Fi add-on, parallel stacking, battery communication; no grid sell-back) and solar input (13,000 W of panels, 600 V max, 2 MPPTs vs 11,000 W of panels, 500 V max, 2 MPPTs).
- Choose the SunGoldPower SPH8048P for value ($181 per kW of continuous output vs $467 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 8K | SunGoldPower SPH8048P |
|---|---|---|
| Overall rating | 4.0/5 | 3.6/5 |
| Value 30% | 47 $467 per kW of continuous output | 100 $181 per kW of continuous output |
| Solar input 20% | 74 13,000 W of panels, 600 V max, 2 MPPTs | 61 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 | 65 UL 1741 listed, Wi-Fi add-on, parallel stacking, battery communication; no grid sell-back |
| Warranty 15% | 100 10-year warranty | 0 1-year warranty |
Specifications
| Fortress Power Envy 8K | SunGoldPower SPH8048P | |
|---|---|---|
| Output | ||
| Output voltage | 120/240 V split-phase | 120/240 V split-phase |
| Continuous output | 8,000 W | 8,000 W |
| Surge | 16,000 W | 16,000 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 | 13,000 W | 11,000 W |
| Max PV voltage (Voc) | 600 V | 500 V |
| MPPT range | 170 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, lead-acid, user-defined |
| Max charge current | 167 A | 180 A |
| AC charge current | - | 100 A |
| Battery communication | Yes | Yes |
| Grid sell-back | Yes | No |
| Generator input | Yes | No |
| UL 1741 | UL 1741 SB | Yes |
| Build | ||
| App monitoring | Included | Optional add-on |
| 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 | 1 year |
| Released | 2023-06 | 2023-08 |