quick question. I know I'll need to do the maths to make sure on the bigger stuff, but I'm planning on using 2.5mm cable for all my 12v lights, USB sockets etc.
It'll only be a bank of 6 LED spot lights on one circuit, a strip led light on another and 3 USB on another with 2m max cable runs so hoping 2.5mm is over kill to be honest
Just a quick note on my recent experiences as a van wiring novice. There is a useful cable size calculator on 12VoltPlanet. @travelvolts web advice and help on the forum was really helpful and I feel guilty that I didn't in the end buy anything from him. @Dellmassive has also been really helpful and his links have loads of good information in them.
I specified 1.5mm for lights and low loads with 2.5mm for high loads like 12v sockets and used 4mm for the fridge feed to ensure it is as efficient as possible.
All the cables were twin core and earthed back to the fusebox (mostly) which should also ensure as little loss as possible. The problem is running the cables though the van and I had trouble with loom sizes as it is a twin slider. It went OK just but is worth planning out. If you also fit mains cable for EHU it also has to fit in.
I went for a 100ah Lithium battery for a number of reasons despite the cost. It weighs a hell of a lot less than two AGM 110ah will and it fits under the passenger seat with the fusebox and Renogy DC-DC. The weight may turn out to be more important than you think depending on your van spec. Mine is a T32 but with 4Motion and extras I am keen to get as much payload as possible. Just a few extra things to consider.
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