I have a SmartSolar MPPT 75/10 controller with a Renogy 100w panel charging my BatteriesPlus X2 Power group 31. Every few days I will see barely any charge for the day. When I check the app, I will see 20v on the panel, and usually just over 12v on the battery, yet 0w from the panel. If I put a load on the battery, and bring it just below 12v, I will start getting a charge. Additionally, if i disconnect the controller from both the panel and the battery, and then reconnect it, it will suddenly start working fine again for a few days.
I am new to solar and completely lost on this. I hope someone can help me out. I attached some screenshots if they help.