Navitron Renewable Energy and Sustainability Forum

WIND TURBINES => Wind Turbines and associated systems => Topic started by: ecogeorge on August 11, 2019, 10:13:44 PM



Title: Windsave -yes they still exist........
Post by: ecogeorge on August 11, 2019, 10:13:44 PM
I seem to be collecting windsaves ! got 3 now but none running.......  All destined for a future life........
Believe the turbine is fine but appreciate the inverter is not the best.
Need to acquire suitable inverters for these and have been interested in the turbine / inverter combo advertised on fleabay by bimble solar who are selling a turbine coupled to a GROWATT 3000 SINGLE MPPT 3 KW SOLAR INVERTER.
The useful thing regarding the Growatt  is the 80v startup and approx 520v max voltage input.
My question is does any know the max volts of a Windsave ???
I have a manual but no voltage is mentioned anywhere ?
Happy to run the windsave unloaded  to measure voltage but what max revs at say 20ms wind speed ??
Any ideas anyone ?
George


Title: Re: Windsave -yes they still exist........
Post by: kommando on August 17, 2019, 03:01:53 PM
The spec I have for a 1000W Chinese wind turbine has a rated rpm of 450, I mounted on a lathe bed and spun the shaft at 500 rpm and measured the unloaded voltage but can't remember the number.


Title: Re: Windsave -yes they still exist........
Post by: biff on August 17, 2019, 03:39:16 PM
 Maybe your Turnip is not  meant to be grid tied.
 There are 2 or 3 off grid 1000watt  Chinese turnips that max at 450rpm. Most are 48volt. I am talking about heavy duty ones with the ribbed alloy casing and 40mm shaft.
These weigh approx 40kgs..
The little blue plate that says 450rpm should also give the voltage. It might say 48volt or even 24.v if it is the Off-Grid model.
  Rogerico ran a few of these for years.
    Biff


Title: Re: Windsave -yes they still exist........
Post by: ecogeorge on August 17, 2019, 09:38:02 PM
oooooooo , never thought of looking on the generator plate ....... and there is one ........
No glasses and  torch so can't see properly but saw 252v  ??
Take a pic tomo and post..
George


Title: Re: Windsave -yes they still exist........
Post by: ecogeorge on August 17, 2019, 10:08:55 PM
Have a pic of name plate ...... assume VO =open circuit voltage ??
Does this mean max open circuit voltage is 283v ???
what does everyone  interrupt from this plate ??
George


Title: Re: Windsave -yes they still exist........
Post by: kommando on August 24, 2019, 06:48:34 PM
I'd assume so but the 800 min-1 is the rpm so that would be the revs to test at.


Title: Re: Windsave -yes they still exist........
Post by: ecogeorge on August 25, 2019, 07:45:08 PM
so at 800 rpm v = 283v  .
Do i assume this is v  max ??
this is well within several  solar mppt  voltage input ranges .....
George.


Title: Re: Windsave -yes they still exist........
Post by: Iain on August 25, 2019, 10:13:23 PM
Hi
Quote
. so at 800 rpm v = 283v  .
Do i assume this is v  max ??
this is well within several  solar mppt  voltage input ranges .....


Surely with a wind turbine  a GTI  can't set to mppt. I think it has to be a voltage / current profile set in the inverter. A profile that keeps the turbine spinning. If it is loaded too much the turbine slows. So the profile has to be set specifically for the size/type of turbine.

Like keeping your car in the correct gear.


Iain


Title: Re: Windsave -yes they still exist........
Post by: ecogeorge on August 26, 2019, 10:50:39 PM
My understanding of mppt was that it maximised  output by varying the input load ....(within a preset voltage range)  -an mppt inverter does not know what the input voltage/current comes from -pv or wind
George.


Title: Re: Windsave -yes they still exist........
Post by: Iain on August 26, 2019, 11:55:31 PM
Hi
Quote
. My understanding of mppt was that it maximised  output by varying the input load

Think that works for PV but too much load will stall the wind turbine. Hence the preset voltage  / current curve needed.
Bit of info here

https://www.voltsys.com/wind-hydro-inverters/

Iain


Title: Re: Windsave -yes they still exist........
Post by: Iain on August 27, 2019, 06:11:51 AM
Hi
I believe the older SMA inverters could be configured for either. The mode could be switched for solar or wind. The "Wind" would then have the option of setting all the various Voltage and current parameters.
Also I believe the inverters were also sold pre set for Wind. Windy. boy for wind, Sunny boy for solar.






Iain