How fast can a CEP mini wind turbine charge my battery?

How fast can a CEP mini wind turbine charge my battery?

This is a very difficult question to answer because every wind turbine installation (even mini turbine installations) has so many variables.

It really comes down to 2 major things to calculate battery charge times: wind speed and the size of the battery.

Here is an example:


  • 15W max Cutting Edge Power mini wind turbine with 12.5" high performance blade.
  • No wind-blocking structures around, such as trees, buildings, etc.
  • 12V lead acid battery at 80% charge.

Assuming you have a lot of wind and the mini turbine is generating about 10W of power, this would be equivalent to 0.8 amps (when charging at 12.5V). 

The math: 10W ÷ 12.5V = 0.8A

One hour of this charging would be considered 0.8 amp-hours.  If you have a 100 amp-hour battery that is at 80%, you could charge it to 100% in about 24 hours of these conditions.  Our cyclone turbine would double the power output because it has a larger, 33W max, generator.

The math: 100% full charge - 80% charge = 20% charge needed

20% x 100 amp hours = 20 amp hours needed

20 amp hours ÷ 0.8 amp hours = 25 hours

If you're having trouble with charge times, or charge voltages, we strongly recommend you measure your wind speed with an anemometer.  Many times when you use a weather app to report wind speeds it ends up being inaccurate.  This is because the weather app's anemometer is 30-50 feet high at the top of a weather station, with no buildings or trees in sight.  Measuring the wind speed yourself takes a lot of the guesswork out of it.


  • Bob

    Hey Christopher, what kind of parking lot bulb? How many watts is it rated for? Maybe you are rotating the generator backwards, or you may have gone over 12V and burned it out.

  • Christopher Pyle

    trying to power a typical 12v automotive parking light bulb for a test only with one of your mini-12 volt dc generators (rated 12v at 1000 RPM) and could not get the bulb to light-up by using a drill & chuck to obtain the rpm’s.
    why doesn’t this test work

Leave a comment

Please note, comments must be approved before they are published