Leisure battery wiring

[gregd72002]

Hi,

I am looking to add a leisure battery to my custom and wondered about the best (safe) way of wiring it in.
For avoidance of double I do have a standard alternator. I will also add fuses on the battery positive terminals.

The last diagram says it all (in reversed order for some reason...)
Would this work, would this be safe?

[dumper]

Number 1 looks ok apart from vsr all advice on hear and elsewhere says you need battery to battery split charger as the mk8 and custom are on smart alternators and if a vsr is used battery will only charge to about 80% but somewhere on hear it says you can earth a pin out in the connecter under the seat box to turn alternator to standard and use a vsr and if you have a stop/start and turn it off it does the same I only spotted this after buying a b2b charger that are not cheap

[moley551]

This question has been asked before, I will try and find a link. I have added a second battery to power chargers ect in the back, my van only has the single std battery. I've tried the smart relay and it just never worked as it should with smart alternator / regenerative charging. I gave up and fitted a 100w solar panel and charge controller and about a year on it works perfectly the Lesiure battery is always fully charged I can hammer it with 4 makita chargers and a dozen 18v batteries I've only had the 1500w inverter turn of with low volts once and less than12 hours later it's fully charged again and the van didn't move. If you do some research you will find that Sterling and a few more makes do a 12v to 12v charger that looks good but at a high price.