Amp Rating
Ok - I thought I understood electricity ratings (watts, volts, amps). I know volts and undestand watts is a measure of work - but amps are a capacity. So when a motor has a rating of 12volts and...
Forum Discussion
jodeb720 wrote:The only issue I have is you are draining the battery at 1C+ and is very fast discharge. Voltage may sag and at this rate the battery rated at 12 amp/hrs may only give half the power before it gets to 10.5 volts. The faster you discharge the less energy you get. Most ratings of capacity is over a 20 hour rate.
This all goes back to me using a 12 volt winch with a 12 amp rating - so if i'm sizing a battery and I expect the motor to run for no more than 10 minutes then i'd use 2 amps if amps are measured per hour.
What am I missing?
1C = 1 x capacity. or 2 amp/hrs in 10 minutes = 12 amp/hrs in 60 minutes.
And that is the full rated capacity discharged in one hour.
Some batteries are OK like lithium, some tolerate a bit better like AGM but most flooded may not serve long. But then if you are only doing this six times a year it may not matter.
I would be looking for a battery with 30 to 50+ amp hours capacity. Or tie into some other system with more capacity.
