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From: Glenn Ashmore
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Subject: Re: Selecting a heatsink?
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NNTP-Posting-Date: Tue, 14 Jan 2003 23:54:30 EST
Date: Tue, 14 Jan 2003 23:56:41 -0500
red rover wrote:
a lot of wonderfully informative stuff
> Is there a reason you are not using a mechanical switch or relay? That
> could save you power if this is simply an on/off device.
Thanks! Now it finally makes sense.!
Like Walter said, Relays don't last long at sea. Also, my testing seems
to indicate that MOSFETs will use about half the power that a fairly
rugged relay will. That is important on a sailboat when you have a
limited amount of battery to run lights fans and radios until the sun
The idea behind this thing is to eliminate long control legs on wires
going to navigation lights. The Coast Guard requires a maximum of 3%
voltage drop at the lamp for these lights. That is hard to do when the
light is at the top of a 60' pole being fed 12VDC and you need to keep
weights down. I want to control the lights from the cockpit on a low
amp line at Vgs and have this box at the base of the mast so the lead
goes directly from the battery to the lamp by the shortest route.
I figure I can build this one with breakers and override switches for
under $120 including having the boards made. Carlingswitch sells
something similar called ECSIII for boats that cost a couple of grand.
It is a little smarter than my idea but for that kind of money it better
I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
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