Kiwiscoot

I have a 2004 Alphard Hybrid which has done the same thing. The 12V battery is very small. I replaced the battery with a bigger one which did not fix the issue. In summer with both aircons on the battery goes low as the current draw exceeds the charging capability of the vehicle (a design fault in my book as an electronic engineer). This car is different from other vehicles in that it does not charge the battery from an alternator but from an electronic battery charger. This charger seems to get overloaded when to many electrical things are switched on. I can see the charging voltage drop from 13.7 volts down to 10.7 when this happens. The voltage goes back up to 13.7V after a while when all the fans&aircons are switched off. It seems like the charger overheats and limits the power. Now all this happens when I use the vehicle in D mode. Currently I am trying S mode to see if the problem still occur.