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Co-author of CanZE. Q210 nov 2013
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As far as I know the car does fairly decent "current following", modulating the chopper in phase with the AC voltage. However, there is ALWAYS the 6A reactive power of the filter capacitor bank (100uF), which of course should be vector-added to the real power to get the total. IOW, it's not so much a matter of "when it is really cold, real is the same as reactive", more like "real current on a very cold battery cannot go above the equivalent of about 6A grid side". And that low power setting is really to protect the battery.

Bottom line: charge immediately after driving when it's cold ;-)
 
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