VanPowerCalc
Size your van battery, solar & wiring in 60 seconds — free
VanPowerCalc launched on March 17, 2026.
What it does
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.
Easily size your solar panels, 12V lithium batteries, and wiring for your campervan. Free web tool.
Instantly size your battery, solar panels, and cables. The favorite tool of the vanlife community. Links marked with * are affiliate links. If a purchase is made through them, I receive a commission at no extra cost to you. The editorial selection and product evaluation are not influenced by commission rates. Your click helps fund this free tool. This is the battery I've been using in my van for 2 years. Reliable, lightweight, and the best value for money out there. The kit I recommend to every beginner. Plug it in, it works, and the included MPPT controller makes a real difference. This document contains the sizing of your future electrical installation, calculated based on your…from vanpowercalc.com
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