Wire Type for connecting two batteries

7aubzxk43m2sni · 20-03-2019 11:40am #1

Hi,

I've a self build camper which I'm wiring up. Unfortunately all the guides I'm following online are american and talk about AWG ratings and stuff that doesn't apply here.

I've used conversion charts and know that I need 1.5mm 2 core flex for most of the 12V stuff, but I've no idea what to call the wire for connecting the batteries, and grounding them.

I'm looking for something like in the picture:

Thanks

seamus · 20-03-2019 11:52am

Your main concern is current. That is, the maximum current that one can expect to continuously draw through the wires. Voltage not so much, a 12V circuit pushing 60a would need heavier gauge than 220V pushing 30a. The above picture shows a battery rated for 120Amps. Which is pretty hefty, so you would want a hefty enough gauge.

Here's a decent reference image: https://marineparts.ie/images/chart.png?1452258420392

It's for boat batteries, but the same principles apply. If in doubt, you're safer using a heavier gauge than a lighter one.

Might be a good idea to give a shout to someone like these guys: http://www.cosycampers.ie

Whatever it is you're doing, they've probably done it a thousand times.

Melodeon · 20-03-2019 12:10pm

25mm2 would be plenty in the setup shown, 35mm2 would be bombproof.
50mm2 wouldn't be a whole lot dearer and would be the full on belt-and-braces setup for maximum peace of mind if you're using bigger batteries.
Get nice flexible 'welding' cables rather than 'battery' cables, as they're much easier to work with.
This sort of stuff:
https://www.automarinecables.com/cables/details.cfm?id=185

The batteries in the picture are wired in series to provide 24v, in case that makes any difference to you.

7aubzxk43m2sni · 20-03-2019 12:37pm

That's brilliant, thanks a lot lads

Wire Type for connecting two batteries

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