I have a Victron CC 75/15 which I thought would work with a 12v or 24v battery configuration. When I have my two 12.6v/100Ah (lipo) batteries in series (24v/100Ah) the PV input on CC doesn't show charging. When battery is in parallel 12v/200Ah there is no problem. The panels, which I have tried in series and parallel, are two 100w/12v/4.25a panels. The reason I want the 24v is my inverter is 24v only. Is there a setting, other than battery 12v/24v, in the CC I am missing?