Temporary leisure battery recharge. Advice needed.

[Derekoak]

We do not usually go to camp sites. For electricity we rely on solar and alternator recharge through a ring rscdc30.
In these strange times, at christmas we may be going to a camp site for some days. Probably no sun, no driving. We will be running down the leisure battery.

If we arrange a hookup, we have a hookup cable ending in a 4 way RCCB protected set of sockets, from a previous camper but no 240 volt infrastructure. I have a 12 volt stabilised power supply 14 amp maximum current, from a computer. I use this to test 12 volt kit in the house. If I connected the power supply to the hookup and onward to the alternator connections of the ring rscdc30, only when the engine is off. Would this charge the 80 ah leisure battery? Or would it blow a fuse? Or worse?

 

[harrow]

I would use a proper car battery smart charger.
Your setup might work but also it might go bang.

 

[st3v3]

I could be wrong, but I don't think 12v will switch the ring on.

 

[Derekoak]

I would use a proper car battery smart charger.
Your setup might work but also it might go bang.

Yes normally I might buy such a thing but I intend to change the leisure battery to Lithium in a month or so. Unless a smart charger charged both existing and new batteries it would be redundant.
If 12 volt power supply will not be successful as a feed for the ring b2b charger, perhaps next best would be to connect it to the fuse box input, then it would not recharge the battery but would keep the fridge and lights on without discharging the battery? Again whether that would be advisable with a potential feed from solar through the ring b2b happening whilst the power supply was connected I am unsure?