One for the sparkys?

[tico]

Neighbour fitting a new anchor winch.
Rated at 1500W @ 12v so 125A
Leads are 10m long .... what cross section cable?
Thanks

 

[harvey38]

95mm2 with 3% loss according to the online calculator but a 10M run seems awful long, heavy and costly.

 

[st599]

What's the acceptable voltage drop?

If you can only accept 1% drop, and you need to keep the cable temperature down due to it passing combustibles, it will be a heavy cable.

 

[simonfraser]

smaller cable and fit a battery up front ?

 

[Seastoke]

Is he leaving the battery on the pontoon

 

[vas]

leads 10m long, as in each lead 10m long or the round trip for the electricity is 10m? if each is 10m then you do the calcs for 20m :-/

 

[tico]

Round trip is 20m..... Gulp!
agree with secondary battery up front

 

[vas]

I've done 20m round trip for a 5kw bow thruster cables were really massive and it was at 24V works fine. Boat was being rebuilt so was easy to route the cables, wouldn't like to do it now though!
20m decent cable at that thickness will be more expensive than a new battery upfront

 

[DavidJ]

Cable sizing tool
DC Cable Sizing Tool - Use The Correct Sized Cables - Free Calculator

 

[tico]

Thanks all... will try to get him to fit an aux battery

 

[DavidJ]

While we have the attention of electrical gurus. I understand the shore power charging of the leisure, cranking and bow thruster separate batteries because there are 3 separate fused channels on my Mastervolt “transformer” but how do the two engine alternators get together to charge 3 separate batteries. Mine must be a fairly average type of set up on a 2002 S37