Sol-Ark SA-18K-2P 18kW Hybrid Inverter On/Off Grid All-In-One 48V Battery Pre-Wired

Sol-Ark SA-18K-2P 18kW Hybrid Inverter

The grid is getting less reliable. Electricity rates keep climbing. And whole-home electrification — EVs, heat pumps, induction ranges — means your power demands are only going up. The Sol-Ark SA-18K-2P was built for exactly this moment. With 18kW of continuous output, 36kVA of surge capacity, and more solar input potential than any other residential inverter on the market, it's the unit you install when half-measures aren't an option.

18kW Continuous. 36kVA Surge. Nothing Gets Left Behind.

At 18,000W of continuous AC output at 120/240V split-phase, the SA-18K-2P doesn't just keep the lights on during an outage — it keeps your whole home running. Central HVAC, well pumps, electric range, Level 2 EV charger, refrigerator, shop tools — all at once, without load shedding or generator support. And with 36,000VA of surge capacity for 10 seconds, hard-starting motors like compressors and well pumps fire right up without hesitation.

More PV Capacity Than Any Other Residential Inverter

Three independent MPPT trackers accept up to 28,800W of DC solar input, with each channel handling up to 36A across a 150–425V operating range and a 500V maximum input voltage. But the real headline is what happens when you add AC coupling: the SA-18K-2P supports over 40kW of total PV input — more than any other residential inverter available today. That means faster battery recharge, more daily production, and a system that keeps up even on short winter days or partially shaded arrays.

200A Pass-Through. No Subpanel Needed.

A built-in 200A grid pass-through means the SA-18K-2P can serve your entire home's electrical panel — no separate transfer switch, no subpanel required. When the grid is up, it passes power through seamlessly. When it goes down, the 5ms automatic transfer time is fast enough that your electronics, smart home devices, and sensitive equipment won't even register the switch.

All-In-One. Pre-Wired. Ready to Mount.

Everything is built in: three MPPT charge controllers, AFCI/GFCI protection, arc fault detection, rapid shutdown, lightning protection, a 200A AC output breaker, and a full-color touchscreen. The IP65/NEMA 3R outdoor-rated enclosure means your installer can mount it on an exterior wall, in a garage, or in an equipment yard without any additional weatherproofing. Fewer components, faster labor, lower total project cost.

350A Battery Integration. Works With What You Have.

With a maximum charge and discharge rate of 350A across dual 48V battery ports, the SA-18K-2P is ready to pair with large lithium battery banks in the 30–50kWh range — delivering multi-day backup autonomy for off-grid systems or extended protection for grid-tied homes. It works with both lithium-ion and lead-acid chemistries, and closed-loop CANBus and RS485 MODBUS communication is supported for top battery brands including EG4, Fortress Power, and SimpliPhi. Battery technology is still evolving — this inverter gives you the flexibility to upgrade storage down the road without replacing the inverter.

Smart Energy Tools That Cut Your Monthly Bill

Time-of-Use scheduling lets you draw from batteries during peak rate hours and recharge when electricity is cheapest. Meter Zero mode eliminates grid export without a smart meter. Peak shaving actively reduces demand charges — a major cost driver for homeowners with large appliances or EV charging. Generator auto-start and smart load management round out a feature set that doesn't just protect against outages but actively works to reduce what you pay every month.

Scalable to 216kW for Larger Projects

The SA-18K-2P is stackable up to 12 units in parallel, scaling to 216kW of continuous output. Whether you're building a large estate system, a multi-family installation, or a light-commercial microgrid, you can start with one unit today and expand without replacing infrastructure down the road.

Data Stays in the U.S. American-Engineered Firmware.

Unlike many inverters that route monitoring data through overseas servers, the SA-18K-2P runs American-engineered firmware hosted on AWS U.S.-based servers. Your system data stays stateside. Built-in Wi-Fi enables remote monitoring and configuration from anywhere through the MySolArk app, and the platform supports fleet management for installers managing multiple sites.

Certified Nationwide. 10-Year Warranty.

Certified to UL1741 3rd SB, UL1741 CRD-PCS, IEEE1547-2018, UL1699B PVDC AFCI, CSA C22.2 No. 107, and Hawaii's SRD V2.0, the SA-18K-2P meets grid interconnection requirements across all major U.S. utility jurisdictions including California Rule 21 and HECO Rule 14H. It comes standard with Sol-Ark's 10-year warranty — and the units themselves are proven to last well beyond it.

Not sure whether the 18K-2P is the right fit or whether you need to step up to a three-phase unit? Our team at A1 SolarStore can help you spec the right system for your home or project — reach out before you order.