Step 4. The final figure should give you the size of your ideal EV-charging solar array in kilowatts. Step 6. Final math is to divide the EV kWh requirements by the solar panel efficiency in kWh ...

This is roughly what system size you need. For example, if your home used 30,000 kWh last year, you would need a 25-kW system. Solar panels are designed to last 25 to 30 years, and your roof needs ...