07-09-2005, 02:04 AM
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Ridiculously Active Enthusiast
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Real Name: Steve
Location: Atlanta, Ga
Hybrids: 2004 Civic CVT Hybrid
Posts: 1,676
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Re: Best way to measure 12v electrical draw?
I would assume that you are concerned with how much energy is left in the battery while "out to sea".
(You'll have the most draw going to the motor while accellerating, against the wind, faster speed etc just like your car)
If it were me looking for a quick low cost way to monitor available power I'd hook a simple volt meter across the (+) and (-) connections of the battery or motor.
I found a nice one for under $13.00 probably avaliable at your local Radio Shack store.
It's the panel mount meter that you can see at http://www.radioshack.com.
Paste this into the search (find) box: 22-410
Your buddy could solder the wires to the meter for you. For safety sake, be sure they are actually soldered (Not just twisted or wound around the terminals as some might do)
A couple of things to remember about this:
*Be CERTAIN that the (+) on the meter goes to the (+) side of the battery and the (-) side of the meter to the (-) side of the battery. If they are attached backward the needle will be forced backwards and can damage the meter.
*If you're worried about water getting into the meter you can always use silicone sealant (Bathroom cauking after the wires have been soldered) to seal any openings.
*Also, don't forget to disconnect the meter from the battery when not using it.
*And last, the best indication of remaining power is while the motor is in use. (A load is applied)
Oh yea...happy sailing! 
Efficient drivers do it better.
 1003 miles a tank personal record. 74MPG calculated. HCH1 CVT
Last edited by Hot_Georgia_2004; 07-09-2005 at 02:14 AM.
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