Formula for TSR to RPM-----Cut in for wind speed

[Roger Stafford]

Hi still new to this and have a few questions.

First a little info. 48 volt gen. I've hooked up 4 x 12v batt through a 3 phase rectifier rated at 1600v 248 amp<don't know if this will cause problems?> Ran through a 500amp shunt to a TM 2020 monitor. My cut in speed is around 85 rpm at 50v with no load.

Spining gen by hand when I reach cut in the 2020 shows 1 amp. My meter on two phases

shows 35vac. Can't spin it much faster but volts and amps both go up.

Then I added a Heating element from a air conditioner 23ohms.

spun it again and went from -2amp to -.5<don't know what this is telling me>

Does it mean my batt is close to full charge and adding the resister made a differance or did I just spin it faster? I ordered a laser tach but it has't arrived.

Is there a formula for TSR to RPM?

I went the long way around and don't know if the answer is right but

According to my figures My cut in for wind speed is about 9 MPH. does this sound right?

[Flux]

"Then I added a Heating element from a air conditioner 23ohms.

spun it again and went from -2amp to -.5<don't know what this is telling me>

Does it mean my batt is close to full charge and adding the resister made a differance or did I just spin it faster? "

You spun it faster but I wouldn't have much faith in a couple of amps measured on a 500A shunt.

"Is there a formula for TSR to RPM?"

Not at cut in . Tsr relates working speed to wind speed at maximum power point.

Cut in depends on friction , blade drag, blade profile and the price of cheese. I think you are near enough at 85rpm and I suspect you will do something from 7mph.

If you used the load tsr figures and got 9mph that seems very likely as tsr falls rapidly above cut in.

[Roger Stafford]

sorry I thought I had posted a thank you for your help,but some how it didn'tpost