I built a small 200 W minimalist system in a box for our off-grid camper using the Rich Solar 20 MPPT and two 12v 55 amp hour sealed batteries. It worked great until I unplugged the solar panels and left for a few weeks. Upon return the batteries were down to 12.1 v (I should not of left them plugged into the controller I guess) and would not take a charge. Plus the load indicator suggested there was a short circuit (did not have this condition before I left). I charged the batteries with a separate battery charger and plugged everything back in and still have the same issues - charge controller reads proper voltage from panels but zero amps and short circuit load light is blinking - even with all loads removed. Is my controller somehow fried? Can it be reset??