Formula For power

[(unknown)]

I am new to this forum and wind energy, I have looked and cannot find any formula that will help me figure out what I really need in a system. ( gen size * battery storage * controller/converter * to a 2 1/2 hp 6 amp 120, volt motor) I would like to run this motor from a battery bank for 4 hrs a day. If any one can explain in LAYMAN terms Please do. Thanks for the help.

[wdyasq]

120. V X 6A = 720 Watts
     
1. HP = 746 Watts - DOH! - something wrong here.... but onward - you say you need it to run 4 hours - 4 X 720 Watts - 2880 Watts.
   
   

"I would like to run this motor from a battery bank for 4 hrs a day. If any one can explain in LAYMAN terms Please do."

Well, as no voltage for the battery bank was given.... and we don't know if this is going to be a continual operation, and we don't know if you want to kill your batteries quickly or slowly....

2880/12V = 240 Amp Hours at 12V - 2 golf cart batteries (T106 Trojan) will die about 3 hours into the project.  And if done every day won't last long.  A bank of 20 would last wuite a while as you would be ony drawing down to 10-15% each time.

To actually get 2.5HP for 4 Hours is another problem.... and any problem takes a bit more information than you have shared.

Ron

[(unknown)]

Thank you

I am very new to this. I am still in the design part of the project.

I will install as many batteries as needed and the motor will run for the full 4 hours, or it can run during the daylight hours, one or two hours at a time.

[terry5732]

Those motor numbers are maximums - how hard will you work it?

Although it is rated 6 amps, it may not draw that much in your application.

Your actual amps/120 volts/4 hours = battery ampacity (+ enough to not kill em) / battery voltage / 4 hours.

Assuming you are drawing 6 amps at 120 volt for 4 hours:

In  12 volt batteries you would need 240 amp/hours capacity for usage. This would run flat dead per cycle and your batteries would not last many cycles. You need to at LEAST double this number to have battery life, plus a little for converter losses, etc.