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can someone help me with the monkey math???

A

Anonymous-0

Well-known Member
Or tell me what the formula is??

Just ordered some 10 watt LED Floodlights that are 12 volt DC...
How do I figure (in a perfect world) how much they draw so I can have a heads up on how often I need to charge the battery?

Using them in two locations, one will have a solar battery maintainer that should cover the draw (only be used an hour or so a day) but the other doesn't get but an hour or so direct sun in winter..

Thanks.
 
(quoted from post at 03:20:31 10/29/12) 10 watt led's will draw .83 amps. The formula is watts divided by volts to get amps.
Click to expand...
So... 1 light will draw 20 amps in a 24 hours... Does that mean it will burn 5 days straight on a 100 AH battery? Or did I miss the boat???
 
Number's right. Unit's wrong.

What you calculated is "Amp-hours" abbreviated Ah.

.83 Amps over 24 hours is about 20Ah.

Theoretically, a 100Ah battery will run the lights for 5 days. However, you really don't want to draw the battery down below 50% on a regular basis, unless you like buying new batteries all the time.
 
(quoted from post at 07:00:56 10/29/12) Number's right. Unit's wrong.

What you calculated is "Amp-hours" abbreviated Ah.

.83 Amps over 24 hours is about 20Ah.

Theoretically, a 100Ah battery will run the lights for 5 days. However, you really don't want to draw the battery down below 50% on a regular basis, unless you like buying new batteries all the time.
Click to expand...

Thanks.... Just wanted to make sure it sunk in :roll:
When I set em up I'll leave a long enough (and thick enough) wire/clips to hook up to whatever vehicle I'm on or a battery that is there for a fence charger... If they are used 5 hours a week, that'll be a lot...
 

Typically the AH rating is based on a 20 hour discharge rate. Therefore, a 100 AH rated battery can deliver 5 amps for 20 hrs (5 amps x 20 hours = 100 AH) before the battery voltage drops below 10.5 volts. At discharge rates less than the 20 hour rate (0.83 amps in your case) the battery AH rating will increase slightly.

However: Discharging your battery to the AH rated level (10.5 volts) will result in greatly reduced life. The chart I have for Interstate deep cycle batteries indicates a life of 2200 cycles to 25% discharge (12.45 volts), 1000 cycles to a 50% discharge (12.25 volts) and 325 cycles to 100% discharge (11.9 volts).

In conclusion: Using your battery for 5 days between charging will result in greatly reduced life.
 
Dave2,
Just a question, why not use a marine battery that will take almost a complete draw down and recover with charger better than auto type battery? Hope it helps.
LOU
 
(quoted from post at 12:21:03 10/29/12) Dave2,
Just a question, why not use a marine battery that will take almost a complete draw down and recover with charger better than auto type battery? Hope it helps.
LOU
Click to expand...

Bucks and thieves............ I have a buddy at the strip lot (junk yard) on post that saves good batteries for me when cars are turned in and I take him used up ones and a bottle of Jim Beam at Christmas..... As soon as I'd put something nice and new out, it'd be gone. And once folks start stealing, it don't stop.... Local BB store has little 800 watt generators with a 12 volt plug on them also for 90 bucks..... Next 25% sale they have, I'll prolly get one as a fall back (they're light and not real loud)... Just need light to feed in the morning and feed /clean in the evening at the 2 outside stalls on weekdays 2 weeks out of the month (2 weeks day shift and 2 weeks night shift).... I hate not being able to see....
 
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