The Solis S5-GR3P12K is a 12kW three-phase on-grid solar inverter with two MPPT trackers, 98.6% maximum efficiency, and an 8-year warranty. It accepts up to 18kW of PV input at a maximum 1100V.
98.6% efficiency puts this at the top of its class. Most inverters at this rating run 97.4-97.6%; 98.6% is near the ceiling of what string inverters achieve. 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 monsoon consumption. For a large home, office, showroom, or small factory with real daytime load, a grid-tied system at 12kW turns a large roof into the shortest-payback asset available.
18kW of PV input on a 12kW 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.
Two MPPT trackers. Each handles 32A operating current (40A short-circuit) higher than the 10kW model's 16A, matching the larger array this unit supports. Each tracker manages its own string independently, so a roof facing two directions, or with a section shaded by a tank through the afternoon, does not drag the whole array down to the weakest string.
The 8-year warranty. 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 12kW inverter suits an array up to 18kW given this headroom. Send our team your panel count, wattage and roof layout and we will confirm 12kW is right, or point you to the 10kW or 15kW.
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, and handles your PM Surya Ghar subsidy application if your system qualifies. 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.
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