Question 1

What is BIS IS 16221 certification for solar inverters?

Accepted Answer

BIS IS 16221 is the Bureau of Indian Standards certification confirming a grid-connected solar inverter has passed India's safety and anti-islanding testing requirements. It applies to the inverter as installed, including its grid connection interface, not just its internal components.

Question 2

Is BIS certification mandatory for rooftop solar inverters in India?

Accepted Answer

Yes, BIS certification is mandatory for grid-connected solar inverters sold or installed in India, including residential rooftop systems. An installation using an uncertified inverter can be rejected for subsidy claims even after the hardware is already fitted.

Question 3

How do I check if my solar inverter is BIS certified?

Accepted Answer

Search the inverter's BIS registration number on the CRS public dashboard at crsbis.in, or use the BIS CARE mobile app. Confirm the licence is active and that the exact model number on the nameplate appears in the list of covered models.

Question 4

Does BIS certification guarantee my inverter will perform well in summer heat?

Accepted Answer

No, BIS certification confirms safety and anti-islanding compliance at the point of testing, not long-term field performance in high heat. Thermal design quality is a separate consideration buyers should evaluate alongside the certificate.

Question 5

What is Zenergize's BIS licence number for its solar inverters?

Accepted Answer

Zenergize's grid-tied solar inverters are certified under BIS licence R-96004600, covering models from the GSTI-2K2-1P through the GSTI-6K0-1P. This can be verified directly on crsbis.in using the registration number.

Question 6

Can I claim the PM Surya Ghar Yojana subsidy with a non-BIS-certified inverter?

Accepted Answer

No, subsidy schemes require the installed inverter to carry valid BIS certification, and applications tied to uncertified equipment risk rejection during DISCOM review. Verifying the licence before installation avoids this delay entirely.

Tag: solar inverter checklist

How to Choose a Solar Inverter Built for India’s Grid and Climate: A 5-Point Checklist for Residential Buyers (2026)

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