RV, Van & Marine Power

RV, Van & Marine Power calculators — each with the formula, a worked example and a reference table. Results are estimates for planning and education; verify all sizing with a licensed electrician and your AHJ.

RV Solar

Enter your daily energy use in watt-hours, your peak sun hours and your 12V or 24V battery…

12V DC Wire Size

Pick the right copper or aluminum DC wire gauge for a 12V or 24V circuit from the current,…

Battery Runtime

Estimate how long a battery will power a load from its amp-hours, voltage, usable depth of…

DC-DC / Alternator Charger

Size a DC-DC (alternator) charger from your battery bank’s amp-hours and a target charge r…

Appliance Amp Draw

Convert an appliance’s wattage into the current it draws at your system voltage. Knowing t…