Hi all - I am very confused about the above topic and was hoping for some input. I have a Citroen Relay 17 reg (which has a smart alternator) which I'm converting to a campervan. I don't use it everyday, and I've been suprised how quickly the starter battery runs down (the immobiliser in particular is apparently a thirsty one). I'm planning out my electrics, but keep reading conflicting info about the best way to keep the starter battery topped up. My starter battery is not a Victron, but the original battery and for economy sake I don't want to change it yet as it's fine.
One method is to not even link the starter battery to the rest of the camper at all, and just use an external trickle charger when needed, however to me this seems like a nuisance. Some people also seem to just disconnect the battery for longer spells and keep the van turned over otherwise, but this is apparently not the best for the battery (not sure how true this is - can only find anecdotal info).
If I design my system to trickle charge the leisure battery then I'm confused between whether I should do this fromthe victron dc-dc charger as I have been told it causes problems when using an MMPT solar charger and a multiplus (which i have already purchased - i have 2 solar panels). Others have said I can just use a cyrix while others a cyrix and a dc-dc charger.
Keeping the starter battery topped up is my priority - having the alternator charge the leisure batteries is just a bonus as I've probably overshot on my leisure battery capacity and my solar panels, and I will be mostly on site where i have shore power, so should never (in theory) need to rely on my alternator to give me a boost. But I want to eliminate the risk of my starter going flat, and reduce the maintenance needed when not inuse.
I'm really starting to tear my hair out on this one - really would appreciate some advice or links! Thanks all