VanPowerCalc

Size your van battery, solar & wiring in 60 seconds — free

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Building a van and tired of guessing wire sizes, battery capacity, or how many solar panels you need? VanPowerCalc does the math for you. Enter your appliances, pick your battery type, and get instant results: battery size, solar wattage, wire gauge, and fuse ratings. No signup, no ads, 100% free. Built for vanlifers, overlanders, and anyone doing a 12V electrical build.