#7 -
Renewable Energy > Technical Discussion: Solar Electric System - Photovoltaic > Re: newbie, here! had an oddly low state of charge
Well my first inclination is your pv setup. 6 - 100 watt panels- 12 volt should be set up in strings of two, if you are setting up for 24 volts. You said you had 4 panels in series so that would make 48 volts, or as you mention, 2 strings of 3 = 36 Volts, so perhaps your charge controller is not working properly. If I am looking at the correct controller, it can be set for 12 or 24 volts only and draws 10mA to operate.
Check any overcurrent device, fuses, relays etc to see if anything tripped.
Rewire your panels for two panels in series (24 volts) sent into a combiner box, then out of the combiner into the charge controller, then out of the controller to the batteries.
Read the manual for the controller. Hook up your batteries first. then connect the output from the combiner box from your panels second. Hook up your inverter directly to the opposite end of the battery bank NOT THE CONTROLLER! If you look in the manual it directly tells you not to hook up an inverter, battery charger or high amp load to the controller. You can hook up small 24 volt loads directly to the load terminals if you desire.
So if your charge controller was not working and you had your fridge hooked up to the inverter and the inverter was wired directly to the batteries, then it obviously has been drawing power from the batteries which are not being recharged.