Quote Originally Posted by the evil twin View Post
IMHO an Aux in teh engine bay doesn't need a 'charger'.
The voltage drop from the Alt to the Aux is bugger all so an Isolator can charge much quicker than a 'charger'.
You only need the SBI12D if you are charging both ways (have solar or whatever hooked to the aux) otherwise an SBI12 is sufficient

Brand is kinda up to the individual but Redarc pretty much set the standard for the non-programmable jobbies
Cheers for that ET, mates with limited knowledge of elec's have been telling me I need a charger for a deep cycle, which kinda scattered my way of thinking. Was set on sbi12 or 12d for external charging until then, but you have cleared that up for me.
Cheers mate 👍