I started experiencing lower than normal DC voltage while on a camping trip, hovering around 11.8 to 12.2 volts. I initially thought the WF-8900 converter was failing as the fan motor was running erratically. After getting back home and diving in, I found that the main terminal from the converter/charger to the main buss was loose. Turns out there were many loose electrical lugs/connections throughout the panel on both the 12 volt and 110 volt side! NOT GOOD!