Thinking of charging your EV with rooftop solar? Most answers online are "it depends" or an installer's sales pitch. VoltSolar shows the math, free with no sign-up. Pick your EV (75+ models), your US state and your daily miles to see: • How many solar panels you need • The installed cost • Your cost per mile: solar vs grid vs gas • If a home battery is worth it Built on EPA ratings, sun data for all 50 states, and EIA and AAA prices. Every formula is on the site.