Convert real power (kW) to current (amps) for single- and three-phase circuits — useful for sizing breakers and cables.
Convert real power (kW) to current (amps) for single- and three-phase circuits — handy for sizing breakers and cables.
Current is found from I = (kW × 1000) / (V × PF) for single-phase, or I = (kW × 1000) / (√3 × V × PF) for three-phase. At 230V a 7kW load draws about 30A, which is why a single-phase home EV charger is typically rated 7kW (≈32A).
Spreading a load across three phases dramatically reduces the per-phase current — the same 11kW draws about 48A single-phase but only 16A per phase on a 400V three-phase supply.
Max Zs values, diversity factors, cable ratings, voltage drop — one printable page. Plus occasional emails with calculator updates and useful tips.