How much power is available for charging?

What the model does

Raw margin = site limit − non-EV peak − reserve. Available headroom = max(0, raw margin). Charging envelope = min(headroom, ports × port rating). Equal share = envelope ÷ ports. Ideal energy envelope = charging envelope × hours, before losses and vehicle limits.

What to check before using the result

This is a static screen. It does not analyse phases, electrical protection, actual load profiles, charger topology, solar, storage, losses, vehicle acceptance or local connection rules. A negative margin flags an inconsistent baseline; zero charging headroom is then assumed. The equal share is an idealised allocation, not a controller setting.