@BrenR you went for the Renogy 200w Suitcase setup - that's a great kit - i have one myself ( and the 100W version)
that kit comes with a very capable PWM controller . .
so yes you could just use that.
However . . . . my case would be,
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The Renogy DC-DC + MPPT solar controller has a "MPPT" which is much better than the PWM and will give you more power per sun hours.
its combined so only one unit needs fitting . . .
it will reverse trickle charge the starter when the LB is full. - the other one wont
The black combined unit runs much quitter and cooler than the blue chargers.
so i would suggest going for this one :
https://amzn.to/3EzPTtx
over this one:
Renogy 12V 60A DC to DC On-Board Battery Charger : Amazon.co.uk: Business, Industry & Science
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i would also sudgest getting the Bluetooth unit that goes with the MPPT charger . . . with that you can adjuest the output and change the setting, and monitor the output etc. . . you cant do that with the blue uni9ts..
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having said all of that i would still keep the PWM controller.
so you then have multiple options . . .
just clip in the PWM controller to the van to charge with quick disconnects,
clip the PWM controller to any other car, van or battery to charge that.
clip just the panel to the MPPT with MC4 quick disconects,
run BOTH the MPPT and the PWM with a second panel.
etc etc etc . . .
just keep adding panels