Hi,
Which DC to DC charger do I need for a 100 amp van battery with 400ah of leisure batteries? Also what size fuse between do I need between charge and leisure batteries? Do I need a fuse between van batteries and charger?
Thanks,
Mel
asked
DC to DC charger needs
You'll need to work out how much power is available from your alternator and how much the van electrics use. Rule of thumb is to aim to keep the charger plus electrics draw below half the alternator output.
Then you need to do the maths on the loads on the house bank and make sure you have enough charging available based on your expected driving time per day. You may need other charging - solar, grid, generator...
thanks, I have other charging, solar and shore, and I have a DC to DC charger from renogy but it keeps blowing the 90A fuse between the van batteries and the DC to DC charger. My solar keeps up pretty well, just would like to get the DC to DC working correctly. I'm willing to buy a Victron unit I just don't know which one would work best.
The Victron model numbers work this way: Input voltage/output voltage-max output current. And there are chargers/power supplies and isolated or non-isolated models to pick as well.
You have a large output leisure battery bank.
Try looking at the 12/12-30 non-isolated charger. But all the warnings apply and you should check this out properly with a competent dealer/installer.
