Bulb Spot Light
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Light bulb burn time?
I have a 12V 50W halogen spot light rigged to a 11.1V 00 mAH Lithium Ion Battery. What is the equation for working out the burn time of the ligt?
Cheers
Sorry battery should be 800mAH. So if i do (800mAH x 11.1V)/50w= 177.6
Is this my burn time in minutes?
Thank you for your help
the bulb requires 4.166 A an hour, at 12 V, you have 0.8 A available which will run it for about 11.52 minutes.
remember a 12V car battery is 13.6V when fully charged and drops to under nominal voltage when discharged, likewise your battery will be above 11V initially, best to measure it with a voltmeter.
from this you can see the calculations only relate to an average voltage.
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