Solis Brand 15 kWatt, Three Phase On-Grid Solar Power Inverter with 8 years warranty

The Solis S5-GR3P15K is a 15kW three-phase on-grid solar inverter with two MPPT trackers, 98.7% maximum efficiency, and an 8-year warranty. It accepts up to 22.5kW of PV input at a maximum 1100V.

98.7% efficiency the highest in the Solis on-grid range. Most inverters at this rating run 97.4-97.6%; 98.7% is at the ceiling of what string inverters achieve, matching Solis's 100kW and 110kW utility units. Across fifteen years, every percentage point lost in DC-to-AC conversion is generation you paid for and never received. 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.

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 commercial premises, a factory, a school, or a large villa with real daytime load, a grid-tied system at 15kW turns a large roof into the shortest-payback asset on the balance sheet.

22.5kW of PV input on a 15kW inverter. That 1.5:1 DC-to-AC ratio lets you build a substantially larger array than the nameplate suggests. Panels rarely hit rated output in real conditions, so an oversized array fills more of the inverter's capacity through more of the day more morning and evening generation, better performance under cloud. The wide 160-1000V MPPT range with an 1100V maximum gives your installer real flexibility in string design across a large roof.

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 through the day, does not drag the whole array down to the weakest string.

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 means downtime plus a replacement bill.

Sizing it correctly. A 15kW inverter suits an array up to 22.5kW given this headroom. Send our team your panel count, wattage and roof layout and we will confirm 15kW is right, or point you to the 12kW or 20kW.

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. 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.