Posted by John in La on August 15, 2014 at 18:56:51 from (96.33.136.54):
Let me make sure I have this correct.
I have two dealer installed SRM-27 Interstate batteries (wired in parallel) in my boat for my trolling motor. This allows me to use the trolling motor for weekend outings and never pull the batteries below 50%. (I know; I should have true deep cell batteries but this is what the dealer installs.)
On a few occasions a year (maximum 4 or 5 times) I would like to use the full draw (80%) of the batteries running several lights to do some night fishing.
Per the link below it is my understanding that I can draw 15 amps per hour and the batteries should last for 10.2 hours. SRM-27; Hrs. at Ampere Load; 15; equals 5.2 With two batteries hooked in parallel this would be 10.4 hours.
The lights do not give amp draw only watts.
Two are 50 watt 12 volt Incandescent A19 light bulbs. Same thing as in your house only 12 volt. This gives me 100 watts total for these two bulbs.
The other is a 35 watt 12 Volt Halogen Tractor Implement Light that I will use as a head light.
So now I got a total of 135 watts. So I took 135 / 12 = 11.25 11.25 should be my amp draw per hour. So even if I add in my marker lights I should be below the 15 amps per hour as I will not use the trolling motor when fishing at night.
So it is my thinking that I should be able to run all three of these lights and my marker lights all night (8 hours maximum) on my two batteries with out a recharge.
So check my math and thinking. Is everything I said correct? I do have a generator I can bring but it is a royal pain it the but to lug around. Plus I really do not like mixing a 110 volt generator and a boat/water. Thanks.
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