Govt Notifies New Minimum Efficiency Standards for Solar Inverters, Effective January 2026
The Ministry of Power has introduced new minimum efficiency standards for grid-connected solar inverters up to 100 kW, applicable to all units manufactured or imported in India from January 2026 to December 2027. Manufacturers must display an endorsement label based on the overall efficiency matrix on the grid-connected solar inverter.
November 14, 2025. By Mrinmoy Dey
Under the new framework, all single-phase (230 V AC, 50 Hz) and three-phase (up to 415 V AC, 50 Hz) non-storage, grid-connected solar inverters must meet prescribed minimum overall efficiency thresholds based on their rated output power. The standards draw upon IS 17980:2022 and IEC 62891:2020 test protocols.
The minimum overall efficiency requirements are set at 92 percent for inverters below 1 kW, 93 percent for inverters between 1 kW-3 kW, 95 percent for those between 3 kW-5 kW, 96 percent for the 5 kW-10 kW range, 97 percent for inverters between 10 kW-20 kW, and 98 percent for inverters above 20 kW. Further, there shall be no negative tolerance in the minimum overall efficiency requirement criteria for obtaining the BEE endorsement label.
Every tested product must meet or exceed the mandated thresholds, including manufacturing variations. The government has also made adherence to BIS compliance and testing under the latest IS 17980:2022 standard mandatory for participation in the BEE labelling programme.
The Power Ministry notification formalises the requirement for manufacturers to display an endorsement label reflecting inverter efficiency categories, based on static MPPT efficiency and steady-state conversion efficiency. Accredited laboratories under NABL, ILAC, APLAC or NISE will be authorised to issue test reports.
The move is expected to bring greater transparency and quality assurance to the solar equipment market, improve system yields, and enhance consumer confidence at a time when India’s solar adoption continues to accelerate across residential, commercial, and utility sectors.
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