Review on 50A Qiilu PWM Solar Charge Controller with Dual ⚡️ USB LCD Display - Intelligent Regulator for Solar Panel Battery by Jeremy Tang

I installed this on a 100 amp lithium battery and a couple of solar panels. I also had an investor connected. The feeder keeps switching off, even when the sun shines all day. I check the system voltage and the voltage fluctuates from 5 volts to 20 volts every second or two. Thought the battery was dead. I unplugged that controller and hooked up another controller to the battery and never had a problem since. So my conclusion is: This controller didn't work properly.