just installed it on our 230AH housebank (AGM batts), negative side, directly on the bank.
Now it is reading only minus amps despite voltage going up to 14,28 when charger
gets switched on (which means there have to be some "surplus" amps)
weirder still: when all consumers are switched off & charger
gets switched on it shows negative amps...& I doubt that the charger is drawing current
& it's not that pos & neg. amps are inverted: in hasn't shown any pos. amps so far