@Dignon, Thought I would share some info that might be useful for you. It’s still very early but I think I solved my issue of the Renogy DCC50S activating the low-temp cut off in subfreezing temps (need to verify once it gets back down <1*C). My goal was to see if I can turn off the low temp protection on the charge controller so it could send DCDC/solar power through to the SOK LiFePO4 heater circuit and warm the battery to take a charge. Not worried about protecting the battery because it has it’s own BMS.
I bought the Renogy BT2 Bluetooth Dongle and used the “Renogy BT” Android app to reconfigure my unit.
The other Renogy app, “DC Home” didnt have as many settings to configure. Changed the battery type to “USER” and copy and paste the Lithium configuration to “USER”. The idea is that it won’t activate the low temp protection under USER battery profile. The Lithium battery profile, the low temp cut off is baked in and can’t be turned off. I also currently have the BTS (Battery Temperature Sampling) cable disconnected. It looks like it has an internal probe. On the plus side, I can limit the charge controller output to 20A to keep the battery as healthy when fast charging isn’t needed.
Renogy BT2 Bluetooth dongle.
Battery Configuration. (Edit screenshot to reflect SOK LiFePO4 recommended settings)
Hope this helps, will update once verified but I have high confidence this will solve my battery heater circuit woes.
Best,
Ron
Edit: Replaced Battery Configuration Screenshot with SOK LiFePO4 recommended settings.