I have a 48v bank of batteries with a Growatt Spf 500es charger/inverter. When I go away for a few days instead of charging up it runs down. If I turn off the switch on the inverter it charges but the next day it stops charging and theres a current draw eventually emptying the battery bank. Tjis is not a problem in summer. I also have a 12v battery bank (lead acid) and it has a wind mill solar charger powered by just one solar panel. It has no problem staying charged. Have I set up the Growatt wrong? I cant see why it should not stay charged when the inverter is off. Can anyone shine some light on this please? I'm pulling my hair out eventhough I'm already bald 




