Here's my setup (thanks to all who helped). This worked perfectly with the new batteries for about 2 weeks and then I noticed that batteries weren't charging as they should. I used my voltmeter to measure voltage from the panels at the controller.
Voltage had dropped from 54 to 39, about 25%.
I checked the oldest panel, a 5 yr. old Trina (all are 24 volt) and it showed 27volts...about right?
I can check for no voltage from a hot line but how to check these connections with 2 branch connectors?
How do I check if a negative to a positive is not functioning? These are all new MC4 's with electrical tape over them to keep rain out.
Appreciate any help, thanks
7 235Watt panels, 4 in series/parallel, 3 in series, 4L16 Deka 6Volt, 370AH batteries, 3000W Cotek pure sine inverter, SRNE ML2440 40Amp Controller + second 40 Amp Renogy controller, 24 Volt system.
4 stand alone PV arrays; 12V gate opener, 24V Dankoff rain water pumping system, 12V Shurflo rain water garden pumping, 12V bathroom LED lighting and fan.
Honda EU3000W generator for backup.
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