Ive got a Givenergy Solar Invertor and battery installed, this was configured to charge the battery over night 12-5am @ 1.9KWH rate, this would result in full battery, this is then used to power the home for most of the day.

Ive recently added Givenergy EV Charger and setup as a configuration D.

What ive found is the ev charger is changing my setting of 1.9KWH Invertor charge rate, back to 3.6KWH factory default, why is this ?