Solis Brand 20 kWatt, Three Phase On-Grid Solar Power Inverter with 8 years warranty

The Solis S5-GR3P20K is a 20kW three-phase on-grid solar inverter with two MPPT trackers, 98.7% maximum efficiency, and an 8-year warranty. It accepts up to 30kW of PV input at a maximum 1100V and weighs 21.1kg.

98.7% efficiency, at the top of the class. Most inverters at this rating run 97.4-97.6%; 98.7% is at the ceiling of what string inverters achieve. On a 20kW commercial installation running for twenty-five years, that difference is a measurable quantity of generation every day, for the life of the asset. When you compare inverters at the same capacity, efficiency and warranty are the two specifications that genuinely separate them, and this unit leads on both.

30kW of PV input on a 20kW inverter. That 1.5:1 DC-to-AC ratio lets you build a substantially larger array than the nameplate suggests a full 10kW more than the rating. Panels rarely hit their rated output in real conditions, so an oversized array fills more of the inverter's capacity through more of the day: more generation in the morning and evening, better performance under cloud, and more total units across the year. On a commercial roof with the space for 30kW of panels, this single 20kW inverter handles the lot.

How an on-grid system works. No batteries, nothing to replace in five years, nothing to maintain. The inverter converts DC from your panels to AC, powers your load through the day, and exports the surplus through net metering so your meter runs backward the credit offsets your night and weekend consumption. For a factory, warehouse, school, or office block with strong daytime load, a grid-tied system at 20kW turns a large roof into the shortest-payback asset on the balance sheet.

Sizing it correctly. A 20kW inverter suits an array up to 30kW given this headroom. Send our team your panel count, wattage and roof layout and we will confirm 20kW is right, or point you to the 17kW or 25kW.

SolarClue is India's managed solar marketplace. Our team confirms this inverter matches your panel array, your three-phase supply and your DISCOM's net metering requirements before you order. Compare it against Growatt and Deye at the same rating on our platform we will tell you which suits your roof, not which we are holding. You book with a token payment rather than the full amount upfront. Supply and installation are coordinated through verified partners, and we handle Solis warranty support afterwards. Check the current on grid solar system price and talk to our team for a specification review and installation timeline in your city.

Two MPPT trackers. Each handles 32A operating current (40A short-circuit), managing its own string independently so a commercial roof facing multiple directions, or with sections shaded by plant structures and tanks through the day, does not drag the whole array down to the weakest string. The wide 160-1000V MPPT range with an 1100V maximum gives your installer real flexibility in string design.

The 8-year warranty on the single point of failure. Most inverters in this class ship with 5 years standard. Eight years is three additional years on the component most likely to fail before your panels do and on a commercial installation, an inverter failure in year six is downtime plus a replacement bill.