Overview
The Sol-Ark Limitless 18K-2P-LV is the most powerful residential hybrid inverter on the market: 18,000W of continuous output, 36,000W of 10-second surge, and support for up to 32,400W of PV. Engineered for the most demanding off-grid and whole-home backup applications, it starts HVAC compressors and large pumps without breaking stride — and stacks up to 12 units for commercial-scale systems.
Key Features
- 18,000W continuous AC output; 36,000W surge (10 s)
- Up to 32,400W supported PV (28,800W usable) across 3 MPPTs, 36A each
- 200A grid passthrough — true whole-home 200A service backup
- 350A continuous battery charge/discharge at 48VDC
- 97.0% CEC efficiency; stackable up to 12 units
- NEMA 3R / IP65 outdoor rated; 10-year standard warranty
Technical Specifications
| Continuous AC Output | 18,000 W |
| Surge Power (10 s) | 36,000 W |
| Max Supported PV | 32,400 W (28,800 W usable), 3 MPPTs |
| MPPT Operating Range | 150–425 V (500 V max) |
| Max Output Current | 75 A |
| Grid Passthrough | 200 A |
| Battery Charge/Discharge | 350 A @ 48 VDC nominal |
| CEC Efficiency | 97.0% |
| Enclosure | IP65 / NEMA 3R |
| Unit Dimensions (H×W×D) | 34 × 18.2 × 11.1 in (863 × 464 × 282 mm) |
| Unit Weight | 137 lb (62.1 kg) |
| Warranty | 10 years |
Specifications verified against the manufacturer's official documentation: Sol-Ark official 18K datasheet (Rev 6, Jan 2026).
Applications
The 18K-2P powers heavier loads than the 15K — commercial RO skids, multiple booster pumps, or a home plus a Solar Oasis watermaker. Its 350A battery current and 12-unit stacking make it the building block for containerized energy and water systems.
Frequently Asked Questions
What's the difference between the 15K and the 18K?
The 18K delivers 18kW continuous versus 15kW, doubles the surge headroom (36kW for 10s), accepts far more PV (32.4kW vs 19.5kW supported) and handles 350A vs 275A of battery current. Choose the 18K for large homes, farms and commercial water systems.
Can it start a large well pump or RO booster pump?
Yes — 36kW of 10-second surge power comfortably starts 5+ ton compressors and multi-HP pump motors. Send us your pump nameplate data and we'll confirm sizing.
Which batteries are compatible?
Any 48V nominal bank, with closed-loop BMS communication over CAN or RS485 for major LiFePO4 brands, including the Pytes E-Box series we stock.
Can multiple units be combined?
Yes — up to 12 units stack for up to 216kW of continuous power, supporting three-phase and split-phase configurations.
Is this product in stock?
Availability changes frequently. Contact us at 408-969-2688 or sales@foreverpureplace.com for current stock and lead time — most items ship within days.
How is this item shipped?
Due to its size and weight this product ships by LTL freight on a pallet, fully insured with liftgate delivery available. We quote freight to your ZIP code before charging anything — contact us for a delivery estimate.
Documents & Downloads
- 📄 Official Datasheet — Sol-Ark 18K (Rev 6, Jan 2026) (PDF)
- 📖 Installation Manual — Sol-Ark 18K (Rev 2) (PDF)
All documents open directly from the manufacturer's official website.
