We have a Blue Solar Duo charge controller charging two Battery Banks, one starter battery and 5 house batteries as 50/50 charge all AGM. The charger was installed in February and was working fine, it has now stopped charging anything. Temperature at that point showing on the charger was 31 degrees.
We have two solar panels in parallel connected to the charger.
The solar panels are each
64 cell (it states this on the back of the panel) in 4 banks of 16
rated power 120W
Max Peak 18V
Voc 21.6V
Max Current 6.67A
When we check the Voc from the panels it was showing 15V but as soon as we connected to the charger the reading across the screw connections was only 3V and the charger not showing anything charging.
We realise that the recommended no of cells for each panel should be a 36 cell solar panel but given that that was a recommendation and not a specific requirement and all other parameters were within the chargers limits thought that would be OK.
We disconnected all inputs in the required order and left for 30 minutes and reconnected and the charger worked so we do not think it is fried but after a short time it stopped charging again.
Should the charger still work with this setup?
