Troubleshooting solar setup... or troubleshooting my troubleshooting!!

[skenn_ie]

Originally Posted by Ocean Sky

Quick update ..so we found the disconnect was caused by a connector between the positive out from the controller and the battery ..just needed a very slight rub with emery paper.

Solar is working fine now and even the AGM are holding their charge at 12.7 with no load over several hours...so will continue to monitor those closely.

Thanks guys for all the input and suggestions

Will start to look at options to upgrade to MPPT and perhaps bigger house bank in the coming weeks.

I suggest that you give it a thorough clean. A light rub will make contact, but probably remain at high resistance. For these purposes, "high" is measured in tens or hundreds of milliohms. 12.5 to 13.5 at low current is likely to be the bulk charge phase, so it will remain at that for extended periods.
Note: NEVER solder, then insert into a screw, screw-clamp, or crimp connector. The solder will cold flow over time,and leave a loose connection. Crimp, then solder, is OK. Ferrule, then clamp is good.

[Paul Elliott]

Thanks for the update!

And I know I'm risking starting another "dielectric grease" argument, but before you reassemble those connectors, smear the contact surfaces with silicon grease or something similar. You will still get a solid connection, and much less corrosion.