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If your fitting say those new driving lights you just purchased, what size wire,relay fuse do you use.
This is fairly easy to calc.
For example
watts divided by volts = amps
EG , 2 x 55w spotties = 110watts
110 watt div by 12 volts = 9.16666 amps. total load amps.
each lamp= 5 amp.
main power= 10amp
and this works in reverse also.
total amp load x volts = watts
9.166666667 amps x 12 volts = 110watts.
so if you know either, watt or amps and volt you can calc what you have. easy.
good idea/practice to allow say 20% increase in cable and relay handling capacity and install correct fuse to protect system.
this is a rule of thumb and only a guide and does not take into account things like distance, voltage drop etc.
heavy load things like a winch or fridge in back, seek out someone qualified. IF YOU HAVE ANY DOUBT ASK SOMEONE QUALIFIED.
I take no responsibility.
I'm sure someone here knows more about taking into account surge load affect.
And can add more to this info I posted
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