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View Full Version : 3 Phase AC Wind Turbine Issues - Low Voltage Error - HELP!


Wind Whisperer
8th June 2017, 01:39
I recently purchased and installed a 48v, 21a, 1200 watt, 3-phase AC wind turbine. I have it going to a 22v-60v, 1000 watt grid tie/inverter, shown here:
https://www.amazon.com/gp/product/B01DC2CCTY/

However, I'm having an unexpected issue. The inverter is giving me an error that the voltage is too low (slow blinking red light). When I check the voltage on the 3-phase AC lines, I get 16v on 2 of the 3 phases of AC, and on the third it reads 0. At one point I saw it turn green and start producing electricity, but that only lasted a few seconds (maybe 20).

Naturally, I figured it was a wiring issue, so I quadruple checked the connections, basically making them so well connected it would take an enormous amount of effort to disconnect them. Here's where things got weird...

The AC line that was showing 0 voltage then showed 16v, and a different line showed 0 volts. So, I took everything apart again and made certain everything was connected properly (it was). When I checked it again, then it was back to the original line showing 0v and the other 2 showing 16v.

I wish it was a wiring issue. I would understand that and could fix it. I'm fairly confident everything is connected well though. It would take an extremely powerful person to disconnect them. The turbine is brand new...

What am I missing? Why is one line showing 0v? Is there more wind needed to get all 3 phases to turn on? What possible cause could there be for the dead line switching from one to another? Even when it turned green and started producing power, I couldn't get a voltage reading on the 3rd line.

My associate says that there just isn't enough wind... That turbine was spinning pretty good though when showing 16v. Probably fast enough to break an arm. Would wind speed really make a 48v turbine show 16v on a 3-phase AC line when it is too slow?

Any help would be appreciated. I have taken electronics classes and wired up solar arrays, installed sub-panels and built circuits... I have very little knowledge about 3 phase AC though. I'd like to think that I'm just missing something obvious. Right now the only thing I can think of is wiring problems, but everything seems to be wired strong, and each line has worked at one point in time (just not all 3 at the same time).

Please help!

Sean Moore
8th June 2017, 03:16
Wait till there's a light wind, just enough to spin the turbine - disconnect the load (your inverter) - then test the phases.

It's very likely your friend is correct.

Do you have any over voltage protection ?

Wind Whisperer
8th June 2017, 07:47
Never any over problems. I have a dump load. It's only met the minimum voltage to turn on once for a few seconds as described above.

I've done the test you say to do. 2 of the 3 phases were showing a voltage load.

Sean Moore
8th June 2017, 07:58
........ 2 of the 3 phases were showing a voltage load.

Could you clarify how you are measuring ?

I'm assuming there's just 3 wires ?

Wind Whisperer
8th June 2017, 08:57
Yes, there is just 3 wires. I am testing using a volt meter by connecting 1 end to a ground, and the other to the wires one at a time. 2 of the wires consistently show ~16v, the third shows 0.

Cor van Houtum
19th August 2017, 12:54
First thing I say is that you have a ground failure in your turbine

When the 3 wires of a PM generator are not connected
and the turbine is spinning then you should measure
between wire 1-2
then between 2-3
then between 1-3
in every two wires should be the same AC voltage

between earth and one of the phase wires you should measure almost nothing

this in case the turbine is NOT connected to anything

Kind regards

Cor