Hello I have solar panel connected to car battery through Pwm, everything works fine, but after I started engine with a bit low battery, on Pwm started blinking U 0.2v, which means voltage on usb output is only 0.2 volts. Normally it shows around 5 volts. It happened me once before and after a while it went back to normal, but now it always stays the same.
Pwm is working normally, only usb is not working.
I haven't found any relevant info on this, do you have any idea what can be causing this and how can it be restored?
P.S: I tried disconnecting the module, but didn't help.