Let me try to clarify my problem. When I was using the panel with the 15 foot clamp on cable I was able to get 6 amps output. The clamp on cable is less than 10 ga. Then I went with my 18 foot 10 ga cable with QD. The 12-16 inch 16 ga wire hooked to the battery & shunt with qd end goes out the side of the batt box, under the van so I don't have to have the box open. The QD way has never given me 4 amps output.
So I'm thinking the 16 ga wire, even only 12-16" long is losing amps. If I replace that with a short 10 ga wire for the batt QD I would hope to get the same amps as with the clamp on cable.
I know moving the cc closer to the batt is more efficient, but it worked well enough as is with the clamp on cable so that is not the reason for the dropoff with the QD cable.
Ninerbikes, that big red cable goes to a switch near the engine starter to allow starting with the house batt if the engine batt dies. There just is not enough room to move things around - I've tried.
As mentioned I am also considering getting the solar 30 cc to have adjustable settings. The current cc goes to float when the batt soc is 90%.