3% drop is 0.36 volts based on 12.0V average over the battery discharge cycle
25 watts will draw 2.1 amps of current (think about getting an LED replacement bulb. 16 to 20 amp hours of current draw per night is a heck of a drain on your house bank. My navigation, steaming, anchor, foredeck and spreader lights are all LEDs. And collectively they only draw about 2.4 amps) Using the equation VOLTAGE DROP = CURRENT X RUN X OHMS PER FOOT and solving for Ohms, you get a target resistance of .001225 ohms. Based on Anchor AWG wire, that is in between the resistance of 10 GA (.00098) and 12 GA (.00175) So 10 GA would be the choice for lower voltage drop, and 12 GA would result in 0.5 V drop, or just over 4% Rick Brass Washington, NC From: CnC-List [mailto:[email protected]] On Behalf Of Paul Fountain via CnC-List Sent: Saturday, July 25, 2015 7:58 AM To: [email protected] Cc: Paul Fountain <[email protected]> Subject: Re: Stus-List Wire Gauge question The Blue Seas calculator says for the voltage drop you need 10 gauge, which has an amp capacity of 40! For the amperage you need ABYC says 18 gauge, so somewhere in between is where Id be. Paul Fountain Managing Director SeaSource Inc. Bookkeeping & IT Services. From: CnC-List [mailto:[email protected]] On Behalf Of Alex Giannelia via CnC-List Sent: Saturday, July 25, 2015 7:36 AM To: [email protected] <mailto:[email protected]> Cc: Alex Giannelia <[email protected] <mailto:[email protected]> > Subject: Stus-List Wire Gaiuge question So here is a question for the electrical engineers regarding ABYC specs and wire gauges If I have a 25watt bulb at the top of my mast and I want to follow the <3% voltage drop rule I need to allow for 140 of run so about a 6 gauge wire. That is huge. My question is have I misinterpreted the tables? Also, what influence does the ground (return wire) gauge on this stuff have? Alexander M. Giannelia President the airborne sensing corporation 555 Richmond Street West, Suite 912, PO Box 1008, Toronto, Ontario M5V 3B1, Canada Phone (416) 203-9858 Mobile (416) 529-0070 Fax (416) 203-9843 *Notre site web est aussi disponible en français! www.airsensing.com <http://www.airsensing.com/>
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