Off-Grid & DC Power Calculators
Size DC wire gauge for voltage drop, plan solar array and battery bank capacity from a daily energy budget, and estimate fuse or breaker headroom for 12V, 24V and 48V systems in RVs, vans, boats and off-grid cabins. Results are wiring and sizing estimates, not a substitute for local electrical code or a qualified installer.
DC Voltage Drop
Find the thinnest standard copper wire gauge that keeps voltage drop at or below your target for a 12V, 24V or 48V DC circuit.
Solar & Battery Sizing
Size a solar array and battery bank from your daily energy use, peak sun hours, system losses, depth of discharge and days of autonomy.