diy solar

diy solar

Low temperature cutoff options when your bms and charge controller don’t.

isstuff

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Joined
Aug 4, 2021
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This question has been asked before but I haven’t found a answer that fits. I have put together a DIY 24v 8s 280ah eve cell battery. Because I want a 24v 200a BMS my options seemed pretty limited and I had to go with a Dali BMS. Unfortunately that one doesn’t have a temperature sensor.

So I picked up a renogy 30A rover charge controller, with temperature sensor. BUT! It isn’t used for low temperature cut off.

So now I only just got the charge controller so it is probably an option to return it. I would need to get another charge controller that is good for my 800w of solar coming in at 48v and 20a and going into my 24v battery. Or I keep the charge controller and get another way of cutting the solar input with some relay rated for 30a that can be switched off when a sensor in the battery reads 1C. Where I live it wouldn’t get to freezing that often but it wouldn’t take many times to kill it.

The renogy rover 30A was a good price, I would like to keep the setup in the same price range.
 
Don’t jump in with both feet others may advise against but I think if you had a single pole open on fall thermostat of some kind and broke a sensor wire it would disconnect. You may be just wanting to stop change but allow discharge, I don’t know how to do that.
 
I am thinking if I switch off at the solar input, then that means there is no power coming into the system when too cold. That way the charge controller isn’t being disconnected from the battery at times, it’s just “never sunny” when it’s freezing.
 
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