One 1 cord, you'd have shorepower 1 on, the main on the left side on, and you have a choice on the right side, if you put it on inverter (also a charger) it will buffer startup loads a bit and you might not trip the shorepower. Looks like you should have shorepower cord 1 plugged in, if only using 1 shorecord. L1+L2 current need to be kept under 50 amps on one cord. At the dock I'd run 1 chiller in the winter on Neptunus'es and it would keep up no problem in South Florida. Summer time you could run off of one chiller but when it's mid-day and 92F outside 1 chiller has trouble keeping up so interior temps might creep up 1-2F during peak heat but can be done. If you haven't had your chillers cleaned recently, have them cleaned as when they get dirty they use more amperage. Does your shorecord have the factory glenndenning plug on it where it plugs into land? You can tell because the rubber boot it is clearly 1 molded assembly to the cord?