Submitted by mario.kadastik on September 2, 2013
I'm curious. Right now I have at home the main braker at 400V 16A. My last months electricity usage was 730kWh or about 23 kWh/day or ~1 kW per hour. Now I don't have electric heating or what not therefore the nightly usage is about the same as daily usage. However the daily usage should probably be peaky with the use of electric ovens etc while the nightly usage is more uniform (computers and what not running steady). So all-in-all I use on average about 9% of the peak capacity of the main breaker.
So my main question is, would I be able to put a separate 16A 400V breaker that feeds off the main one for the EV charging and charge the MS from that. However I really wouldn't want the MS to hog the 100% capacity up to 16A because it's likely to kick out the main breaker then. Can I specify that it charges not at 11kW rate, but at say 8-9 kW rate? I'd still get 40-45 km per hour of charging and a full tank overnight as well as being able to waive all costs of additional ampers and just swap the current typeF connector to a type-II connector with new cable and breaker (basic electric work, likely costing no more than a few hundred euro). However it requires the charge rate to be configurable from the car.
Or actually how the heck does the car know what amount is available? What do I need to install at home to make sure the car doesn't overreach itself without kicking the breakers.