Thanks for the information.
Just looking into batteries and charging for use in Motorhomes.
Lots of info. on the net, but nothing like practical experience.
Doing a few experiments with a Concorde battery given to me from work.
I know its not a 'Leisure' battery but just seeing what happens.
At moment using it to drive a Philips 20W (100W equivilent) low energy bulb through a 150w inverter. According to a plug in meter its drawing 16W at 2Amp. Its a 25a/hr battery. Just want to see how long it lasts.
If such a battery was connected in parallel to car battery would it charge ok.
As i suspect a car alternator only ok for replacing whats used by starting.
But if i alternated between two batteries long before they became significantly discharged then they could be used, just a thought.