My point was that **if** you want to take advantage of high PV volts to let you put panels far from the van, **then** you would want a better dedicated controller rather than the (IMO afterthought) built into the DCDC.Use the Blue Sea Circuit Wizard app to size wire. Higher voltage from the panels reduces the need for heavy copper, better to get a dedicated MPPT solar controller for flexibility.
Keep the SC near the target bank.
The ds250 is an mppt control. Buying a separate mppt solar controller is a waste of money. No reason to spend a couple hundred bucks for a programmable controller for a 100w panel.
Here a Victrom MPPT that can handle over 60V input is under $80.
Apples to apples far better output than the CTEK in any case, fully adjustable and full logging graphs with a dongle or PC connection etc.
Proper heavy copper over long distance is awkward and more expensive.