flat leisure battery with roof still up scenario

[Loz]

fair point -- but would this be safe & oK in general (rather than this specific example)?

for example to top up leisure battery whilst out for the day ?

Yes as long as you don't exceed the rating of the socket and the circuit supplying it. The scenario is self-limiting as the size of the panel you can put in the windscreen will only be 1 or 2 amps max.

 

[kp64zl]

OK -- thanks for that @Loz -- although not self limiting if put outside! worth noting