help w/ my 24v battery system

moonbow
moonbow Registered Users Posts: 22 ✭✭
in Off Grid Solar & Battery Systems #1
Good morning. Yesterday AM I awoke to my 24 v charge controller "beeping" to alert me to LVD. I checked the reading on the CC and it read below 12V. Consider that I have 4 12V AGM batteries comprising my system. I shut down the load draw and let the sun do its charging thing through the day. In the PM the batteries showed 13.3V. II fired the system back up but kept the load at a bare minimum through the night.This morning I noticed the battery bank was only reading 12.5. I took my volt meter to each battery. Two of the batteries are reading 13.6 while the other two are reading 11.8. Obviously there is something wrong with one, or two, of the low reading batteries. What next? I assume I need 12v batteries in even numbers to total 24v so do I just count the two low reading batteries as "bad" and disconnect them from the system? Thanks
· Share on Twitter

Comments

  • 706jim
    706jim Solar Expert Posts: 529 ✭✭✭✭
    #2
    Try disconnecting the two low batteries and see what transpires. What sort of loads will you be applying to the system? And what are the A-hr ratings of your batteries?
    Island cottage solar system with approximately 2300 watts of panels, 1kw facing southeast 1.3kw facing southwest. All panels in parallel for a 24 volt system. Trace DR1524 MSW inverter which has performed flawlessly since 1994. Outback Flexmax 80 MPPT charge controller four 467A-h AGM batteries. Insignia 11.5 cubic foot electric fridge 1/4hp GSW piston pump. My 32nd year.
    · Share on Twitter

Categories