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
4.1/5
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.
- 18 kWOutput
- 48 VBattery
- 28,800 WSolar input
- 110 WIdle draw
- 10 yearsWarranty
Check price at Shop Solar Kits$6,298
Price checked October 23, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 18 kW continuous and 36 kW surge start central AC and well pumps without load shedding
- 200 A grid passthrough backs up a whole 200 A service
- Takes nearly 29 kW of panels on three trackers
- Outdoor-rated with a ten-year warranty
Cons
- 110 W idle draw uses about 2.6 kWh of battery a day
- Expensive, and sold mainly through installers
- At 137 lb it needs a mounting crew
The Sol-Ark Limitless family
Every Sol-Ark Limitless model we rank, smallest first. Ratings compare each against its own output.
| Model | Output | Rating | Price |
|---|---|---|---|
| Sol-Ark Limitless 12K-2P-LL | 10 kW | 4.0/5 | $3,849 |
| Sol-Ark 15K-2P | 12 kW | 4.1/5 | $4,999 |
| Sol-Ark 18K-2P (this one) | 18 kW | 4.1/5 | $6,298 |
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 | 18K-2P-LV |
|---|---|
| Output | |
| Output voltage | 120/240 V split-phase |
| Continuous output | 18,000 W |
| Surge | 36,000 W |
| Max efficiency | 97.6% |
| CEC efficiency | 97% |
| Idle draw | 110 W |
| Transfer time | 5 ms |
| Parallel units | Up to 12 units |
| Solar | |
| Max PV power | 28,800 W |
| Max PV voltage (Voc) | 500 V |
| MPPT range | 150 to 425 V |
| MPPT trackers | 3 |
| PV current per tracker | 36 A |
| Battery and grid | |
| Battery voltage | 48 V |
| Battery types | Lithium, lead-acid |
| Max charge current | 350 A |
| Battery communication | Yes |
| Grid sell-back | Yes |
| Generator input | Yes |
| UL 1741 | UL 1741 SB |
| Build | |
| App monitoring | Included |
| Enclosure | IP65 / NEMA 3R |
| Dimensions | 34 x 19.4 x 12 in |
| Weight | 137 lb |
| Warranty | 10 years |
| Released | 2025-09 |
Alternatives in this output
Growatt SPE 12000 US
For off-grid homes that need whole-house 240 V power and a big solar array at a very low price per kW.
Self2Solar $1,769$1,769
EG4 12000XP
For off-grid homes that need whole-house 240 V power and a big solar array at a low price per kW. Grid-tied owners who want to sell power should look at a hybrid instead.
Signature Solar $2,099.99 Shop Solar Kits $2,099.99$2,099.99
Compare
Compare the Sol-Ark 18K-2P with any other hybrid solar inverter →
More from Sol-Ark: every Sol-Ark product ranked.