The Ministry of Power (MoP), in consultation with the Bureau of Energy Efficiency (BEE), has mandated that all solar inverters with a rated capacity of up to 100 kW must meet a minimum overall efficiency requirement and display a BEE endorsement label.

The mandate will apply to solar inverters with a rated capacity of 100 kW and an output voltage of 230 V ac, 50 Hz for single-phase inverters and 415 V ac, 50 Hz for three-phase inverters.

Such solar inverters must meet the minimum overall efficiency requirement of the inverter based on static maximum power point tracking efficiency measurement and the steady state conversion efficiency prescribed in IS 17980:2022/ IEC 62891:2020.

They must also display an endorsement label issued by the BEE on the solar inverters, showcasing the overall efficiency matrix.

In June 2025, MNRE released draft guidelines for the approval and testing of solar inverters under the Solar Systems, Devices, and Components Goods Order, 2025.

The overall efficiency of the inverter will be calculated as follows:

ηt = ηconv x ηMPPTstat = PAC / PMPP,PVS

Where;

ηt : Overall efficiency

ηconv : Conversion efficiency

ηMPPTstat : Static maximum power point (MPP) efficiency

PAC : Measured AC Output Power to the device under test

PMPP,PVS : MPP power provided by photovoltaic simulator

To qualify for the award of endorsement label, the solar inverters must meet the minimum overall efficiency requirement as follows:

The minimum overall efficiency requirement will be valid from January 1, 2026, to December 31, 2027.

All tested inverters must meet the minimum threshold after accounting for manufacturing tolerances and other variations.

To determine the endorsement label for solar inverters, they must be tested for overall efficiency against Clauses 4 and 5 of IS 17980:2022/ IEC 62891:2020

A manufacturer of solar inverters will submit a test report from a lab accredited by the National Accreditation Board for Testing and Calibration Laboratories, the International Laboratory Accreditation Cooperation, the Asia Pacific Laboratory Accreditation Cooperation, and the National Institute of Solar Energy.

It can also submit reports from a third-party test lab or a manufacturer-owned test lab.

To qualify for the BEE labeling program, solar inverters must also be BEE-compliant.

In August 2025, MNRE extended the deadline for solar inverters of more than 200 kW capacity to conform to the Bureau of Indian Standards to June 30, 2026.

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