Does the 30% solar tax credit apply to solar for EV charging?

Yes. The 30% federal ITC applies to the entire solar system regardless of use. The EV charger itself also qualifies for a separate 30% Alternative Fuel Vehicle Refueling Property Credit (up to $1,000 residential).

EV Solar Calculator

How many solar panels do you need to charge your electric vehicle? Enter your daily miles, EV efficiency, and existing solar — get your answer.

Your EV driving

Daily miles driven?

miles/day

EV efficiency?

mi/kWh

EV presets:

Your solar setup

Existing solar system?

Location (peak sun hours)?

Electricity rate?

$/kWh

New panel wattage?

Additional solar panels needed for EV

10 panels (4.0 kW)

EV electricity need5,214 kWh/yr

Existing solar covers0 kWh/yr

Remaining to cover5,214 kWh/yr

Annual charging cost$782/yr

Equiv. gas cost (30 MPG)$71/yr

Annual EV savings vs gas$-711/yr

CO2 saved (vs gas car)4.5 tonnes/yr

Link copied to clipboard

How to Use This Calculator

Enter your daily driving and EV efficiency

Enter your average daily miles driven — include your commute, errands, and any regular trips. Then enter your EV efficiency in miles per kWh. Find this in your car's mobile app (Tesla shows Wh/mile — divide 1,000 by that number to get mi/kWh), on the EPA window sticker, or use one of the preset buttons for common EVs.

Enter your existing solar and location

If you already have solar panels, enter the system size in kW. The calculator will subtract your existing solar's annual production from your EV's annual electricity need to show only the additional panels required. Enter 0 if you're starting fresh. Select your location for accurate peak sun hours.

Review your results

The result shows additional panels needed, your annual EV charging cost vs. equivalent gasoline cost, and annual savings. The "remaining to cover" figure is the shortfall your new panels need to fill.

The Formula

Daily EV kWh = Daily miles ÷ EV efficiency (mi/kWh) Annual EV kWh = Daily kWh × 365 Existing solar production = System kW × peak sun hrs × 365 × 0.86 Net kWh needed = Annual EV kWh − existing solar production Panel annual kWh = (Panel watts ÷ 1000) × peak sun hrs × 365 × 0.86 Additional panels = ⌈Net kWh needed ÷ Panel annual kWh⌉

The 0.86 factor accounts for system losses — temperature derating, inverter inefficiency, wiring losses, and soiling. EV charging efficiency (typically 85-90% for Level 2 AC charging) is not separately modeled; actual wall-to-wheel efficiency is somewhat lower than the EPA mi/kWh rating.

Example

Suburban driver, Tesla Model Y, 5 kW existing solar — Atlanta, GA

Daily miles50 miles/day

EV efficiency3.5 mi/kWh

Existing solar5 kW

Peak sun hours5.0 hrs (Atlanta)

Rate$0.12/kWh

Result

Annual EV electricity need5,214 kWh/yr

Existing solar covers7,884 kWh/yr

Additional panels needed0 panels (existing covers EV)

Annual charging cost$626/yr

Equivalent gas cost~$2,130/yr

Annual EV savings~$1,504/yr

In this scenario the existing 5 kW system already overproduces enough to cover EV charging. A driver with no existing solar needing to cover 5,214 kWh/yr would need about 4 additional 400W panels in Atlanta.

FAQ

How many solar panels does it take to charge an EV? ▼

A typical EV driving 30 miles/day (10,950 miles/year) at 3.5 mi/kWh needs about 3,129 kWh/year. In an average US location (4.5 peak sun hours), a 400W panel produces ~565 kWh/year. So you would need about 6 additional 400W panels (~2.2 kW) to fully solar-charge that driving. Adjust for your specific miles and location using this calculator.

Can my existing solar system charge my EV? ▼

It depends on your system size and driving distance. A 5 kW system produces roughly 6,000–8,000 kWh/year depending on location. If your home already uses 900 kWh/month (10,800 kWh/year), your existing system probably can't cover EV charging without expansion. If your home is energy-efficient and uses less, there may be surplus production available for EV charging.

Is it cheaper to charge an EV with solar vs. grid electricity? ▼

Yes, over time. Solar charging (after system payback) has near-zero marginal cost. Grid charging at $0.15/kWh for an EV doing 10,000 miles/year costs about $430/year. At $0.35/kWh (California, Hawaii), that's $1,000/year. Solar panels that produce those kWh cost roughly $800–1,200 installed per kW, and last 25+ years — so the payback on EV-dedicated panels is typically 5–10 years before you're charging nearly free.

Does the 30% federal tax credit apply to solar for EV charging? ▼

Yes. The federal Investment Tax Credit (ITC) at 30% applies to the entire solar system regardless of what you use the electricity for — EV charging, home loads, or selling back to the grid. The EV charger itself (Level 2 EVSE) also qualifies for a separate 30% Alternative Fuel Vehicle Refueling Property Credit (up to $1,000 for residential use). See our Solar Tax Credit Calculator for details.