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Old 02-28-2008
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For some reason, a 30-amp panel sounds awfully small for what you've got listed. A good stereo system can easily use 10-12 amps if you've got it turned up and four speakers attached.

I'd also agree with Btrayfors that the 4 AWG is way too small... For a 3% drop in voltage, for 100 amps and a total distance round trip of 15', wire that is 2 AWG is recommended, and I'm a big fan of going up at least one wire size as a safety factor... If the distance is more than 20' round trip 1 AWG or 0 AWG wire is recommended.

You also might want to re-think the running light breaker setup. You'll probably want at least three switches for the running lights, especially if you have both deck-level running lights and a tri-color.

One switch would turn on the deck-level lights (stern & bicolor), one switch would turn on the steaming light (required when you're motoring), and one switch would turn on the tricolor.

An alternative setup would be one switch for the deck-level bicolor, one for the tricolor and one for the stern light, and you could use your anchor light for both the stern and steaming light when under power.

A digital voltmeter is a much better idea...since they're accurate enough to give you a rough idea of battery charge state. 12.6 VDC is roughly a fully charged battery, 11.6 VDC about dead... 12.1 VDC about 50% discharged and time to charge again.
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