Electronics > Projects, Designs, and Technical Stuff

What kind of variable load does an EV car present to the EVSE?

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richard.cs:
Another approach used for EV charging in the UK is not to meter power usage at all. Instead they just say this is a x kW nominal charger and it costs £0.yy per minute to use this service. If your car can't charge that fast or is nearly full then tough. Possibly this is due to a desire to avoid metering related regulations, but it also gives users a financial incentive to terminate the charge when it begins tapering off, freeing up the charge point for other users.

741:
The charger is 3-phase capable, my involvement is very late-stage. I have had no input to the hw design. It's just evaluating the viability of what has been already done. I do not yet know how the client wants to use metering.

741:
Is there a way to query the car's existing energy state (how full the 'tank' is) ?.

Also, do most EVSE & most cars use the digital protocol? I guess it's "analog alone" or "analog & digital" (but never just digital), analog being the fall-back.

mikeselectricstuff:
The only status the evse knows is charge current (though it's not actually essential to.measure it, so may not even have that), so no way to know state of charge, other than the tapering off when close to 100%

richard.cs:
So far as I am aware most of the AC EVSEs use the variable duty cycle square wave, I assume that's what you mean by the "analog protocol."

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