Can You Charge Your EV With Solar Panels?

Key Takeaway:
Charging your EV from the grid pushes your TNB bill into the highest tariff tier. A solar system sized to match your daily driving can cut your combined home and EV electricity costs by RM 300–400 a month — and the savings only grow as fuel and electricity prices rise.

Have you bought an EV car, thinking it was the right step to avoid rising fuel prices? Then the TNB bill arrives and you’re left surprised.

Charging an electric car every night quietly adds 150–200 kWh to your monthly consumption, which is enough to push your household into the highest tariff band, where every unit costs 57.1 sen.

Solar panels solve this problem cleanly. Here's how it works, what size system you need, and what you can realistically save.

Why Charging Your EV At Home Gets Expensive Fast

TNB's tiered tariff structure means the more you use, the more every unit of electricity costs. Most Malaysian homes sit comfortably in the mid-range tiers before EV ownership. Add a daily charge of 50 km in a BYD Atto 3 or Proton e.MAS 7 — and your household consumption jumps by roughly 180 kWh per month.

That extra consumption lands in the upper tiers at 54.6–57.1 sen per kWh. You're essentially paying RM 98–115 a month just to charge the car. And because the higher usage drags more of your existing consumption into steeper bands, your overall bill climbs more than the raw EV charging numbers suggest.

Source: TNB domestic tariff schedule (Peninsular Malaysia)

Solar panels emerge as the clean solution to this challenge. Here’s how it works, what size system you need, and how much you can realistically save.

How Solar Panels Power an EV at Home

Solar panels produce DC electricity. The inverter then converts it to AC, the same type your home and EV charger run on. When the sun is up and your car is plugged in, the power flows directly from the panels to the charger.

Any surplus generation gets exported to the grid under Malaysia's Solar ATAP programme, earning a credit that offsets whatever you draw at night. You don't need a battery to make this work. The simplest and cheapest strategy is to charge your car during the day, a smart wallbox on a timer or solar-priority mode handles this automatically while you're at work.

If you prefer to charge in the evenings, adding a battery changes the equation. Our breakdown on whether solar batteries are worth it in 2026 walks through whether that upgrade makes financial sense yet.

What System Size Do You Need for EV Charging?

The right system size depends on your daily driving distance. Most modern EVs consume around 15–17 kWh per 100 km. In Malaysia, the average urban commute is 30–60 km per day, meaning a daily charging requirement of roughly 5–10 kWh.

In Malaysia, 1 kWp of solar panels generates approximately 4–4.5 kWh per day, given average peak sun hours of 4–4.5 hours. Use that as your sizing baseline.

Total system size includes to cover typical home consumption of 500-700 kWh/month.

One thing to check early is your roof space. Each kWp needs roughly 6-7 m² of usable panel area, so a 7 kWp system takes up around 42-49 m² manageable for most double-storey terrace and semi-detached homes, but tighter on single-storey properties. Our roof suitability checklist is a good first step before you commit to a system size.

How Much Can You Save Each Month?

You get savings from two directions: lower home electricity costs and reduced EV charging costs.

Here is a realistic scenario for a semi-detached home in Selangor, with a 50 km daily commute, assuming a roof that can accomodate a 7 kWp system (approximately 42-49 m²):

• Before solar: Monthly TNB bill of RM 350 (home) + RM 100 (EV charging) = RM 450 total
• After a 7 kWp solar system: Monthly TNB bill drops to RM 80–120, with EV charging largely covered by solar generation
• Monthly savings: RM 300–370

Over a year, that is an estimated RM 3,600–4,440 back in your pocket. Against an installed system cost of roughly RM 26,000–32,000 for a 7 kWp system, the payback period sits at around 7–9 years, well within the 25-year performance warranty.

TNB tariff increases and rising petrol prices make the solar and EV combination more compelling with every passing year.

Choosing the Right Home Charger for Solar EV Charging

Not all home EV chargers work equally well with solar. The charger type affects how efficiently you can use your solar generation during the day.

Some smart wallboxes let you set a solar-priority mode, where the charger only draws power when the solar system is generating above a set threshold. This maximises self-consumption and reduces grid dependence to near zero on sunny days.

Solar Panels For EV Charging: The Verdict

Solar panels and an EV are one of the strongest financial combinations available to a Malaysian homeowner right now. The EV kills petrol costs, while the solar system itself reduces the electricity cost of running the EV. Size the system right and you have an asset that pays for itself and keeps paying for the next two decades.

Ready to see your numbers? Run an assessment of your home through our free Solar Savings Calculator (it takes under two minutes) or if you’d rather talk it through first, chat with our solar advisors for a no-obligation assessment.