Thanks for your advice.@The Flying Scotsman I would only use two smaller leisure batteries rather than one big single battery if I wanted to spread the weight around the vehicle but with lithium typically lighter than lead acid my Roamer 230Ah seatbase battery isn't much heavier than the 100Ah lead lump it replaced but has nearly five times the useable capacity.
Regarding more solar panel area and it is a bit of a balancing act as quite often on sunny days my shunt will show nearly 20A going into the battery on top of the 3.5A being sucked out by the fridge meaning the battery is frequently at 100% with still over 200A available first thing in the morning leaving me to turn off the panels and recently throttle back the Renogy DCC50S app to 30A rather than 50A and stop blowing the 60A glass tube AGU type fuses I've installed... must change these to something like maxi fuses.
The Renogy DCC50S B2B present version will take your solar input as well as the alternator and now has an higher input voltage so will suit series or parallel panel combinations.
To the rigid versus flexi panel debate I'll say this was T6 camping at Busfest last year and not a rigid panel in sight...
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I’d imagine the fact that flexi’s are cheaper as well as miles easier to fit is the reason that most people opt for them ?