How Do I Add Electricity To My Potter 15?

Posted By: Brett Evett - WWP 15' "Cassiopeia" San Carlos Mexico
Date: 2/7/08 1:47p.m.

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I am purchasing a Garmin 420S Chartplotter / Depth Sounder / Fish Finder. Since I have no electricity on board and I require all of these features to have a successful trip charting dive sites in the sea of cortez, what options do I have to keep this one piece of equipment running for about 2 weeks? Any input you may have regarding this would be extremely helpful. Here are the specs of the Garmin 420S. Power Source Required: 10-35 Volts DC Unit Consumption: 15 Watts Max At 13.8 Volts DC I think that my math is correct here but let me know if I am off. It's been a while since I took electricity / electronics in school!!! So, to figure Amps drawn, I take Watts Divided by Volts and come up with Amp Draw correct? So to plug in the numbers, (15 watts / 13.8 volts = 1.09 amps) Does this mean that I could use a 100 Amp Battery for about 90 hours without a charge??? This is all pretty new to me so bare with me! Also would a small solar panel be sufficent to maintain the battery charge during use throughout the day as I plan to use the chartplotter about 6 hours per day? Thanks for everyones input! -Brett