I bought a pair of Sirrocco 12v fans for our van and was fitting them yesterday , I piggybacked them off the 12v lighting in the bedroom that way I could conceal any wiring .
I spoke to the manufacturers sparky and he said if he were retro fitting the fans then he'd do the same .
The wiring on the back of the fans as supplied , its the same gauge as speaker wire . I've had some speaker wire in my kit so I ran that thru the ceiling and into the cupboard
on each side , roughly two metres each fan. I haven't connected it up yet as i'm thinking maybe the voltage drop could be too much . Any ideas .
It will be fine, given that the amps are as you say 0.4 on high.
I would use 3mm TS Auto Cable and not speaker wire ( about $1.00/Mtr) and I would check if anything else is wired into that circuit that you may not know about.
The easiest way to check is pull the fuse for that circuit and see what does not operate. (for just in case)
Those fans are great and their current draw is amazingly small - you could put just about any cable on them and they'd still work just fine. (e.g. 3mm auto cable is about the smallest we get, and over 5 metres there's be less than 0.1 Volt drop!)
We had a small 12v fan fitted to the rear of our fridge to get rid of excessive heat. During one hot spell it ran for two days continuously & flattened our 110ahr battery.
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I did my Caframo fan a little different after having it cutting out a lot when I plugged into a cig socket and join in cable. I decided to run 12guage cable 4mts direct from battery into the back of fan direct, at end of single bed on door side of van with a in-line fuse next to battery, Works a treat with no cut outs. I have it on all night and notice no difference in battery in the morning. The only thing is, I get a slight vibration noise due to being fixed to a hollow partition. Working on that one.
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DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)
