Club 80-90 Forums

hi everyone could someone advise me on what amp wire i need to run from my leisure battery to my secondary fuse box please ? it will be powering a couple of downlights and a propex heater cheers jeff

what wattage are the two together .. is the question jeff

then it's a simple calculation current (amps) = power(watts) divided by Volts (12Volts

thanks kev i will have to check the downlights the propex is a 2000w heater i think jeff

no that's the gas equivalent ... you need to know what electrical power it requires to run the fan.

Oh and what length is the wire to run

Then also consider the length of cable and the voltage drop - too much drop and your Propex will not work. Use as heavy a cable as much as double what amps you expect to carry if you have a long run to cut down on voltage drop.
I have tested Webasto heaters with long undersized cabling - they just don't like the volts not getting up them!

lol sorry kev never thought about that the cable runs from the battery behind the seat to the wardrobe on drivers side rear about 3 metres i think unless i bring the fuse box closer ?

need an exact figure jeff, as oldie says propex's dunna like voltage drops

thanks lads i will have to get all the figures together and exact length of wire i need then work it out using the calculation and come back and ask you if im right

ive just checked my lights and there are 3 lights at 20 watts each and the propex site says it draws 1.8 amps continous running so would that mean 3x20/12 = 5amps + 1.8 amps for the propex say 7 amps total then double it for the 3metre run ?

you would need 10mm² cable or (8AWG) for an acceptable 1% loss for that length and amperage

cheers kev ive just noticed i cant spell secondary either lol

we can accept that you being a brummie and all that

http://www.autoelectricsupplies.co.uk/p ... ategory/11" onclick="window.open(this.href);return false; thanks kev is the cable i need the last one on here ?

Little late but.......

http://www.solar-wind.co.uk/cable-sizing-DC-cables.html" onclick="window.open(this.href);return false;

Go to the bottom.

thanks billy ive saved that page cos ive got a memory of a goldfish so that will come in handy