A relative newbie asking about low voltage disconnect
Greetings from Southern Arizona, here in the Mule Mountains in Bisbee! I have included some pictures of my set up that I have inherited. I'm not completely new to solar, but my brain often turns to mush when I'm researching problems so I hope somebody can help me! As you can see, I have very thick 1/0 cable on my batteries and going to the inverter. I am looking to install a low voltage disconnect, set the disconnect voltage at 24.2/24.4 on my 24 volt system, to prevent the batteries from going below that overnight. See, my refrigerator is my main drain on this system, and it would be nice to be able to monitor the voltage just a little bit less often. I figure if the system turns off overnight, my fridge will only be off for a couple hours before the sun comes up and triggers the reconnect voltage. I hope this makes sense. I'd rather have the fridge shut off for a few hours than have my batteries drop too low overnight. The fridge is really the only thing plugged in and running overnight other than my Wifi router.
So my questions are... what amperage does this low voltage disconnect need to be rated for? My charge controller is 40amps. I have this thick 1/0 cable but all of the LVD units I see aren't equipped for cable like that. Which one should I buy? Sometimes I feel like it's the wild west when trying to buy solar equipment resale.
These forum threads on here have helped me out a ton already, and I hope I can get help with this too.
Mike in Bisbee