Charging an EV with Solar Panels (Philippines)

A typical EV uses roughly 16-17 kWh per 100km driven, or about 6 km per kWh — so a household with a 30-40km daily commute adds roughly 150-200 kWh a month of charging, about 3-4 solar panels’ worth of output. The bigger factor isn’t panel count, though — it’s when you charge. Charging during the day uses your solar output directly; charging overnight draws from the grid unless you’ve added a battery to store daytime production for later.

How many kWh does a full EV charge actually take?

It depends on the car’s battery size. Popular EVs sold in the Philippines span a fairly wide range:

A full charge from empty runs roughly 40-60 kWh for most of these models — but few owners charge from fully empty every time, so day-to-day charging usually means topping up a partial charge rather than filling the whole battery in one session.

How many panels does regular EV charging add?

Using roughly 6 km/kWh, here’s how daily driving distance translates to monthly kWh and added panel count, on the same bill-to-panel math as our how many solar panels do I need guide:

That’s on top of whatever your household already uses — see our how many panels to run a whole house guide for how to combine EV charging with the rest of your home’s load before sizing a system.

Why does daytime vs. nighttime charging matter so much?

Because of how net metering prices exported power. If your panels produce more than the house uses at that moment and you’re not charging the car, that surplus gets exported to the grid and credited at roughly ₱5-7/kWh — well below the retail rate you’d otherwise pay to charge at night. Plugging the EV in during the day instead means that surplus goes straight into the battery pack rather than being exported cheap and bought back at full price after dark. For households that can charge while at home during the day (weekends, WFH schedules, workplace charging on weekdays), that timing shift is worth more than adding extra panels.

What if I can only charge at night?

Then the car draws from the grid like any other nighttime load, unless you’ve added a battery large enough to store daytime solar output for overnight use. That’s a real option, just a more expensive one — battery storage adds meaningful cost on top of panels, and an EV’s charging load is large enough that sizing a battery around it specifically is a bigger decision than adding a battery just for lights and a router during a brownout. Weigh that against your charging schedule before assuming you need one.

How much does home EV charging cost without solar?

Grid-charged, expect roughly ₱8-15 per kWh depending on your rate schedule, working out to about ₱1.50-2.50 per kilometer driven — already cheaper than a typical gasoline car’s ₱5-7 per kilometer. Solar charging during the day pushes that cost down further, since you’re using power you’ve already paid to generate instead of buying it from the grid at retail.

Do I need a special charger, or does a regular outlet work?

A standard 220V outlet (Level 1 charging) is enough if you’re charging gradually over several daytime hours, which pairs naturally with solar production. A dedicated Level 2 charger — typically ₱20,000-70,000 plus ₱5,000-20,000 installation — charges faster, which matters more if you need a full charge within a short window rather than trickling it in over a full day of sunlight.

How do I size a system that covers both my house and my EV?

Add your EV’s expected monthly kWh to your household’s current usage, then run the total through the cost calculator — it handles the bill-to-panel-count math for you and gives you an installed cost range for the combined system size, rather than sizing your car and your house separately.