Solar AMC Renewal: A 90/60/30 Reminder Plan

7 November 2026 · PiDuty team · 5 min read

Solar technician with a clipboard and two engineers inspecting a solar array for an AMC renewal health visit

The best time to sell a paid solar AMC is 90 days before the free five-year CMC ends, not the week after. Under MNRE's PM Surya Ghar rules the vendor maintains the plant free for five years from commissioning, and after that the cost moves to the consumer. A simple 90/60/30 day plan, with a letter, a health visit and a signed quote, turns that handover into renewal revenue instead of a lost customer.

Why does the end of CMC need a plan?

Section 7(d) of the 7 June 2024 Operational Guidelines makes registered vendors repair and maintain the plant free of cost for five years from commissioning. The Delhi Solar Portal adds that after the warranty period, maintenance costs are borne by the consumer, and notes that inverter warranties usually run 5 to 7 years while panels typically carry 25.

Consumers are not lining up to buy AMC on their own. A CEEW study reported by The Hindu on 24 October 2026 found only half of rooftop solar adopters monitor daily performance, and a service manager quoted in the piece said AMC awareness among households is poor. If the EPC does not start the conversation, nobody will.

What is the cost of skipping maintenance?

Dust is the easiest loss to explain to a homeowner. A study in Energies (MDPI) measured average annual transmittance loss from soiling of 7.9% with weekly cleaning and 12.9% with no cleaning in Tezpur. A 2024 IEEE study put annual losses without cleaning at 14% in Delhi and 20% in Jaipur, falling to about 5.5% and 5.75% with a performance based cleaning schedule. Numbers like these belong in the renewal letter.

What does the 90/60/30 reminder plan look like?

Days before CMC end	Action	Proof to keep
90	Send a renewal letter with the CMC end date and AMC options	Letter copy and delivery record
60	Do a health visit: cleaning check, inverter log, cables, earthing	GPS check-in, photos, generation reading
30	Share the AMC quote and close it	Signed quote or a recorded reason for no
0	Start the AMC schedule or close the plant record	First AMC ticket with a due date

The 60-day visit does two jobs. It completes your last free CMC duty, and it gives the consumer fresh evidence of how the plant is doing. A photo of a dusty array and the inverter fault log are more persuasive than any brochure.

What should a paid AMC include?

Visit frequency, for example quarterly, and how many of those include panel cleaning.
Inverter and electrical checks on each visit, including fuses, MC4 connectors and earthing.
A response time for breakdown complaints.
Which spares are covered and which are billed.
Help with OEM warranty claims, since inverter warranties often end around the same time as CMC.

Keep it short and priced per year. The consumer should be able to compare it with calling a local electrician only when something breaks.

Where does PiDuty fit?

In PiDuty, each plant stores its commissioning date, so the CMC end date and the 90, 60 and 30 day reminders come from the record, not a spreadsheet. The health visit runs as a service ticket with GPS check-in, photos and e-signature in the technician app, and the AMC contract then creates its own scheduled visits.

In short: PiDuty is solar service software for Indian EPCs, rooftop installers and O&M teams, covering service tickets, AMC, warranty by serial number, QR asset tracking and a technician app.

Plans start at Rs57,820 a year for Solar Hub, with Solar Hub Pro at Rs78,000 a year, and there is a 7-day free trial. See pricing for details, or read our guide to CMC vs paid AMC.

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Frequently asked questions

When should a solar EPC start the AMC renewal?

Start 90 days before the five-year CMC ends. That leaves time for a letter, a health visit at 60 days and a signed quote by 30 days.

Who pays for maintenance after the five-year CMC?

The Delhi Solar Portal says maintenance costs after the warranty period are borne by the consumer, so a paid AMC is the usual route.

What should a paid solar AMC include?

Write down the visit frequency, cleaning scope, inverter and electrical checks, response time for faults, spares terms and help with OEM warranty claims.