DC to DC Charger Wire and Fuse Calculator ‣ Clever Solar Power

Simplified DC to DC Calculator Wire and fuse sizing for starting battery to DC to DC charger and to household battery. System characteristics Starter system Starter/alternator voltage (at charger input) (V) House system House battery charge voltage (V) DC-DC charger output current (A) DC-DC charger efficiency (η) Allowed voltage drop (%) Cable type / insulation rating Cable lengths Input wire length (one way) Input length unit Output wire length (one way) Output length unit Enter values and click Calculate. Notes: Voltage drop uses copper at 20°C (ρ = 0.0171 Ω·mm²/m) and round-trip length (2 × one-way). The recommended cable size must satisfy BOTH current capacity and voltage drop. Disclosure: Product links are affiliate links. If you buy through these links, I may earn a commission at no extra cost to you.