Fortress Power Envy True 12
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
4.2/5
For off-grid homes that need whole-house 240 V power and a big solar array at a very low price per kW.
- 12 kWOutput
- 48 VBattery
- 18,000 WSolar input
- 75 WIdle draw
- 5 yearsWarranty
Check price at Self2Solar$1,769
Price checked October 23, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 12 kW of 120/240 V from one unit at under $150 per kW
- Takes 18,000 W of panels on two 550 V trackers
- Charges at up to 250 A, refilling a large battery bank fast
- Separate generator port and closed-loop lithium communication
Cons
- About 75 W idle draw uses close to 2 kWh a day
- Indoor IP20 enclosure needs a dry, sheltered spot
- Certified as off-grid; utility export is not confirmed
The Growatt SPE US family
Every Growatt SPE US model we rank, smallest first. Ratings compare each against its own output.
| Model | Output | Rating | Price |
|---|---|---|---|
| Growatt SPE 6000 US | 6 kW | 4.1/5 | $1,399 |
| Growatt SPE 12000 US (this one) | 12 kW | 4.2/5 | $1,769 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its output. How we rank explains each one.
Specifications
| Model number | SPE 12000 US |
|---|---|
| Output | |
| Output voltage | 120/240 V split-phase |
| Continuous output | 12,000 W |
| Peak efficiency | 95% |
| CEC efficiency | 94.5% |
| Idle draw | 75 W |
| Transfer time | 20 ms |
| Parallel units | Up to 9 units |
| Solar | |
| Max PV power | 18,000 W |
| Max PV voltage (Voc) | 550 V |
| MPPT range | 60 to 480 V |
| MPPT trackers | 2 |
| PV current per tracker | 27 A |
| Runs without battery | Yes |
| Battery and grid | |
| Battery voltage | 48 V |
| Battery types | Lithium, lead-acid |
| Max charge current | 250 A |
| AC charge current | 250 A |
| Battery communication | Yes |
| Generator input | Yes |
| UL 1741 | Yes |
| Build | |
| App monitoring | Optional add-on |
| Enclosure | IP20 |
| Dimensions | 550 x 465 x 150 mm |
| Weight | 47.4 lb |
| Warranty | 5 years |
| Released | 2025-09 |
Alternatives in this output
EG4 12kPV
For grid-tied homes that want battery backup and net metering from a mid-size inverter. Pay the premium over the XP line only if you need grid sell or an outdoor install.
Signature Solar $2,999.99 Shop Solar Kits $2,999.99$2,999.99
Sol-Ark 18K-2P
For large homes that want seamless whole-house backup with no load shedding. Few inverters match its output, but it costs well over most rivals.
Shop Solar Kits $6,298$6,298
Compare
Compare the Growatt SPE 12000 US with any other hybrid solar inverter →
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