Why does Scotland require a 12v socket LOL, first do you mean a ciggy socket or a 12v to usb or something else, what are you trying to power.
What I setup for someone on the forum I think works quite well ... 12V Socket connected to the Leisure Battery (with fuse protection for the cable - essential) which can be used both as an output for devices or also for an input for a portable Solar Kit (that includes a regulator).We have a PowerOak solar generator. It can be re-charged from 240V at home, or from a portable solar panel or from the 12V cigarette-lighter socket when driving.
We do have a folding solar panel we can use to re-charge the PowerOak but that requires us to be somewhere we can set the panel up outside, which isn't always possible. However, we do have 240W of solar panels on the roof of the van so it occurred to me that we could re-charge the PowerOak by plugging it into a 12V socket connected to the leisure battery — only, of course, when the sun was shining and the leisure battery was already fully charged and sitting at Float.
If I understand you correctly, that sounds ideal. I could plug my PowerOak into the 12V socket to re-charge it from the leisure battery (it is a 200aH lithium battery), while the leisure battery was being topped up by the roof solar panels. But I could also plug in our portable solar panel (which does have a built-in regulator) to work alongside the roof panels (so giving me 3 x 120W) to re-charge the leisure battery on those occasions when we need to charge the leisure battery more quickly (i.e. the sun isn't going to shine long enough!).What I setup for someone on the forum I think works quite well ... 12V Socket connected to the Leisure Battery (with fuse protection for the cable - essential) which can be used both as an output for devices or also for an input for a portable Solar Kit (that includes a regulator).
This was an internal Socket, but what I have added on my own Motorhome is an external SAE socket that I can use to plug in my own portable Solar Kit to supplement the roof-mounted Solar.
Basically yes.If I understand you correctly, that sounds ideal. I could plug my PowerOak into the 12V socket to re-charge it from the leisure battery (it is a 200aH lithium battery), while the leisure battery was being topped up by the roof solar panels. But I could also plug in our portable solar panel (which does have a built-in regulator) to work alongside the roof panels (so giving me 3 x 120W) to re-charge the leisure battery on those occasions when we need to charge the leisure battery more quickly (i.e. the sun isn't going to shine long enough!).
Have I got that right?