Comment Re:Time to refit your house (Score 1) 450
... Not all that many will have an extra 30 amp circuit, and none have a 75 amp circuit anywhere.
You must not live in the "heat pump belt". My house - a whopping 1200 Ft^2, built 1990 - has a 200A service entry
Being an electrical type, in possession of a clamp on ammeter with analog out and a DAQ system, I did some measurements some time back. Long story short: I could handle (install another circuit) for that 75A load and charge that car. But I'd need to choose which to do without: Heat/Cool, hot water or cooking with the conventional oven. Peak usage is ~140A. And let us not delve into inrush currents
Another item which has received little or no consideration: Power Factor. Currently, utilities "eat" the wasted power from residential service with a PF of 0.7 - 0.8 lag. Wonder how those chargers work? Hopefully not variable-reactance XFMR (worst from a PF vantage). Or phase controlled (SCR / triac - not much better). Or inverter-chopper (can be PF friendly)? Anyone know?