Adding to existing Growatt system | DIY Solar Power Forum
Only other tip I can think of is that often the lead set for the dual (uses a bigger gauge wire from inverter to first battery) is difficult/impossible to get the housing and gland back over and screwed back into the inverter, this is caused by a little too much heat shrink on the cables that connect to the inverter stopping the gland sliding up far enough, carefully trimming
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