diy solar

diy solar

Huge voltage drop when connected to batteries

Jc0wl3y

New Member
Joined
Jul 19, 2022
Messages
3
Hi All,

Getting a voltage drop from 13.8 or so volts out of my charge controller when not connected to batteries or when connected to a spare stand alone batteries down to 1 volt when connected to my boat batteries.

Setup is 4x sun power solar panels wired series / parallel (2 together in series to make an array and then the two arrays in parallel) and a Victron mppt 100/30. 3 group 29 batteries wired in parallel.

I’ve tried disconnecting shore power to eliminate the shore power charger. I’ve switched controllers with a friend who has a similar setup and my controller works for him so it’s not that. Connections are all tight.

At a complete loss. Thinking it has to do with the batteries but not sure what to check at this point. Any ideas?
 
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