Posted by John T on December 02, 2015 at 15:05:28 from (216.249.74.3):
In Reply to: 12 volt barn light wire posted by Hay hay hay on December 02, 2015 at 08:24:20:
Hay hay, lets do the math in order to answer your questions:
1) "I am putting 4, 12v --27 watt LED lights in a remote barn." That's 108 total watts and at 12 volts that's 9 amps of current draw.
2) "Question: the 4 lights are 8, 10, 20 and 30 feet from the battery. Can I use solid copper regular 12ga. house wire for this" SURE but I prefer stranded wire a) for the added flexibility and ease of installation b) you only need 2 conductor twin lead versus 12/2 with Ground typical 3 conductor Romex house wiring. Id compare prices from 12/2 Romex versus 12/2 twin lead.
3) "and will that reduce the voltage drop versus stranded wire? NO 12 gauge is still 12 gauge wire I dont forsee any excess voltage drop problem with using 12 gauge wire over a relatively short 30 foot run at 9 amps.
4) "Also, any idea how long the lights will operate on a fully charged 100 amp deep cell battery? YES I have an idea plus will calculate an approximate answer:
The lights will draw 9 amps and your battery is rated for 100 Amp Hours. I don't recommend you discharge your battery over 50% of its rated capacity (actually I don't like to draw down over 30%) THEREFORE I would figure you have 50 Amp Hours available. 50 Amp Hours (capacity) divided by 9 amps for all 4 lights = 5.5 hours of use to discharge the battery to 50% of its capacity BUT I DONT LIKE TO DRAW MORE THEN 30%, do as you please.
NOTE FOR BILLY BOB AND BUBBA These are only quick and dirty approximations, may NOT be exact, I could calculate them given more battery info SO NO WARRANTY. As battery voltage drops from 12.6 down to 12 or so, current will change so the exact answer may be different.
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