[C38] Wiring Question

[D. R. Strong]

Steve: For a few hundred bucks (less?) you can replace all of those 
incandescent lights with LEDs and greatly decrease your power draw.
don

Steve Smolinske wrote:
> I am getting ready to replace some of my wiring and my electrical 
> panels.  I have been drawing up my schematics and would love some 
> input on my calculations and assumptions.  I have based my assumptions 
> on an all night sailing scenario with continous use of systems that 
> would quickly draw down my batteries but conservation is another topic 
> at this time Im more interested in determining proper wire size for 
> peak usage.   Ive assumed that I would be using:  3 cabin lights (4.5 
> amps), Running Lights (2.5 amps) VHF (2 amps), Depth and Knot (2 
> amps), Wind (2 amps), Auto Pilot (1 Amp) Radar (8 amps) GPS (3 amps) 
> Heater (8 amps) and Refrigeration (5 amps) for a total of 38 Amps 
> multiplied by postive and negative wire run length of 15 feet (Battery 
> Cable to the batt switch then from there AWG 6-8 to the pos. bus and 
> from the neg. bus back to the battery) which equals 570 Famps.  Based 
> on the wire charts for a 3% drop this puts me in the 6-8 AWG wire size 
> to and from the batteries.   Any comments on any of these numbers is 
> greatly appreciated.   Refrigeration, Heater and lights are  variables 
> calculated on the high side just to be safe.  
>  
> Thanks all,
>  
> Steve
> Peregrine #312
> ------------------------------------------------------------------------
>
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-- 
Donald R. Strong
Professor
Section of Evolution and Ecology
University of California Davis
95616
530 752 7886

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