Connecting leisure battery to fuse box terminal?

[dontknowz]

Hi just wanted to double check if im ok connecting the positive 12v cable to the free 40 amp connector on the fuse box? I’ll attach a picture so you know what Im on about but i want it as neat as possible and don’t really want it on the battery connections. Im running 40 amp inline fuses and atm im connecting it directly to a 12v kill switch and then into a fuse box to power the lights and usb ports for now and I’ll eventually put a smart charger and leisure battery in once i have the funds

Cheers





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[Doc]

So long as the wire you are using is rated for 40A or higher, there shouldn't be an issue.

[Revtnr]

You should use split charge relay so will not drain the crank battery.


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[Nicklouse]

I would not.

I would have it connected directly to the main battery with suitable sized cable and fuses.

Why, if you have been using the leisure battery and put it a state of low charge there is the potential for a large current to be drawn by it at the start of charging from the alternator.

Not saying that it is wrong but I would be expecting blown fuses or blown fusible links.

I use 100amp fuses and a 120amp voltage sensing relay along with cable rated to 110amp. My alternator is rated at 140amp.

[dontknowz]

I would not.

I would have it connected directly to the main battery with suitable sized cable and fuses.

Why, if you have been using the leisure battery and put it a state of low charge there is the potential for a large current to be drawn by it at the start of charging from the alternator.

Not saying that it is wrong but I would be expecting blown fuses or blown fusible links.

I use 100amp fuses and a 120amp voltage sensing relay along with cable rated to 110amp. My alternator is rated at 140amp.

Hi so atm I’m not running a leisure battery and the cable is connected to a kill switch and then plugged straight into a 12v fuse box but the cable i have is 110A and i have 40A inline fuses for the time being I’m going to get a smart charger victron 30a non isolated so I’m thinking with that in place you can set what rates it charges the leisure battery and with it only being a max of 30a the 40a fuses will be fine? Im still doing research into it so not 100% would you say with all that in-place id be safe to use it or just stick with it on the battery?


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[Jenk0]

Hi i have 2 x 200AH lithium batteries fitted in the rear of mine. I connected cable directly to alternator output routed to follow existing charge cable but in length of trunking then through a mega fuse with a 60A fuse. Then up to a 50amp DC-DC charger. Works great and will deliver maximum charge to the leisure battery without detriment to your cranking battery and is much safer than a split charger. (Which was my original installation) and works well with smart alternators if you have a newer van. It will also charge your cranking battery if you are connected to a solar charger. Hope this helps.