MC4 problems solved: Todd's double crimp. Correct connector pin seating.  

shop.airspool.... Connection points at MC4 connectors are the most-likely problem in any solar terminal devices (e.g., heat pumps, MPPTs, DC pumps). We look at the most common culprits. And, your device not working is the runner-up prize. Getting lower-quality power may mean that you have a weak connection which may cause first. #dcpower #offgrid #offgridliving #solarac #solar