Solar canopies over charging bays: does the arithmetic work?

Solar canopies over charging stations look like the obvious answer and are usually oversold. The honest version is more modest and still worth doing.

The mismatch

A canopy over four parking bays supports roughly 25 to 30 kWp of panels. In Rajasthan that generates about 120 kWh on a good day. A single 180 kW dispenser running flat out consumes that in forty minutes. Solar cannot power fast charging directly.

What it can do

Offset. A busy four-bay urban site sells 1,200 to 1,600 kWh a month. The canopy contributes 3,000 to 3,600 kWh a month — which, netted against the site's total draw including AC bays, lighting and cooling, meaningfully reduces the grid bill and, with net metering, exports the surplus.

Where it genuinely shines

AC destination charging. A 7.4 kW wall box under a solar canopy is very nearly powered by the sun during working hours. Office and mall sites with AC bays are the best fit by a wide margin.

The secondary benefit nobody counts

Shade. A car parked under a canopy in a 44°C summer starts a charging session with a cooler pack and accepts more power. Cabin temperature at return is a customer experience improvement drivers notice immediately.

Batteries change the maths

Add a 100 kWh buffer battery and solar becomes genuinely useful for DC charging: store through the day, discharge during evening peak, and shave the demand charge that dominates a site's bill. The battery, not the panel, is doing the economic work.

Verdict

Do it for AC-heavy sites and for shade. Do not promise customers that their fast charge came from the sun — it did not, and the claim does not survive scrutiny.