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post #4 of Old 10-17-2013 Thread Starter
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Continuous duty, non-thermally compensated alternator: options?

I recently installed a battery monitor, so I developed a detailed energy budget today. Here's what I came up with:

Device Daily Use
Refrigerator. 28.8
Stereo. 15.0
Anchor Light. 7.6
Chartplotter. 5.4
LPG Solenoid. 4.0
Tillerpilot 3.8
Tablet Charger. 4.5
Fan 3.5
Lamp (LED) 3.5
VHF Radio 3.4
Propane Sniffer. 1.5
Navigation Lites. 1.1
Depth Sounder. 0.8
Cell Charger 0.4
Total 83.4

My house bank of two golf cart batteries is 220 AH, which is 2.6 times my daily load. Perhaps a bit undersized, but not by much (might be able to make up the difference with some additional refer insulation).

Assuming an alternator charge rate of 25%, I should have an alternator of about 55 Amps, which is right in the ballpark. I like the looks of the Balmar 70 amp model (series 6), if only it weren't so expensive ($650)!

Not too familiar with solar, other than I almost never see panels on boats around the marina. Not sure if the Puget Sound cloudy weather (other than summer) makes it ill suited.

1981 Spirit 28 "Bonnie Lass"
Bremerton, Washington

Last edited by Rusty123; 10-18-2013 at 11:56 PM.
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