Charging an EV From Your Own Rooftop Solar

An electric vehicle changes a household’s electricity use more than almost anything else people add to a home, and it is worth thinking through separately from a standard solar sizing conversation.

An EV charger is a large, new daytime load

A home EV charger draws a meaningful amount of power, often more than most other single appliances in the house combined, and for hours at a stretch rather than in short bursts. If you already have solar sized to your pre-EV bill, adding a car to the household without re-checking the sizing is a common and avoidable mistake — the existing system may simply not generate enough surplus to meaningfully offset the new load.

Timing matters more here than almost anywhere else in solar

Solar generates during daylight hours; most people plug in an EV to charge overnight, out of habit carried over from petrol-refuelling routines or simply because that is when the car is parked and free. Getting real benefit from solar-offset EV charging usually means shifting at least some charging to daytime hours when the car is at home and the sun is generating — a scheduling change, not just a hardware one.

Housing societies: the subsidy already covers this

If you live in a housing society considering common EV charging points, the good news is that PM Surya Ghar’s ₹18,000-per-kW society subsidy explicitly includes EV charging infrastructure, alongside lifts, common lighting and pumps. See our housing society subsidy guide for how the society-level claim works.

The honest limit

Charging directly from solar, moment to moment, only works while the panels are actually producing more than the rest of the house is using at that instant — a genuinely sunny midday with the car plugged in, for example. Most home EV charging will still draw from the grid at some point; what solar does is reduce the net cost of running the car, not eliminate grid dependence for it entirely, and we would rather tell you that plainly than oversell a “charge your car for free” line that does not hold up in practice.

Sizing it properly

Tell us your current or planned system size and the EV charger’s rating, and we will tell you honestly whether your existing system covers meaningful EV charging or needs a genuine re-size — not just add capacity without checking first.