Navitron Renewable Energy and Sustainability Forum

Energy/Electricity Storage and Use/Grid Connection => Grid-connected Renewables => Topic started by: Alan on May 05, 2008, 12:31:42 PM



Title: Grid Inverters, are there any worth buying ?
Post by: Alan on May 05, 2008, 12:31:42 PM
Grid Inverters, are there any worth buying ?

I have a Master Volt Soladin 600. U.K. spec. I have tested my one with a variac. ( variable voltage transformer )
under voltage setting at 200 V.A.C.
over voltage setting at 257 V.A.C.
I have tried it with a constant voltage transformer to eliminate grid surge problems.

D.C. input voltage is constant at 105 volts by electronic well smoothed supply.

Does it work. Yes when it feels like it, maybe 30 % of the time. There is no set pattern to when it decides to have a rest, sometimes just as the cooling fan starts up.

As per previous posts the hardware is very nice ( printed circuit board design ) what really lets it down is very weak software.

Is it worth buying. No

Windy Boy 6 K.W.

It has never failed on Grid A.C. under / over voltage problems.
The software is good.

I could write several books on why not to purchase one of them.

Is it worth buying No.

Has any one got any info on an inverter that is fit for purpose.

Regards

Alan

P.S. Any one got any stuffed one that I could evaluate why they failed.


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on May 08, 2008, 02:07:46 PM
Hello

I have been doing a lot of research on this and as far as I can tell the only Grid Tie inverter designed specifically for wind turbine use is the Magnatek Aurora.  The others are modified PV inverters.

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: Ivan on May 11, 2008, 12:28:44 AM
Is the magnatek G83 yet? I spoke to them a few years ago, and was very interested in representing them in the UK, but after many 'it will be ready in 3 months time' emails, I eventually gave up, as clearly development was taking longer than anticipated. It did look good, when I first investigated, though.

Having said that, I haven't heard of anyone using them yet...


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on May 14, 2008, 03:38:29 PM
Hello Ivan

According to the data sheet for the Aurora 3600 it has G83/1 approval.

Regards

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: Ivan on May 15, 2008, 01:07:15 AM
I would expect them to have it by now....but then again, when I first enquired, their tech info stated that it was g83 approved, but they told me they'd done this 'in preparation'!


Title: Re: Grid Inverters, are there any worth buying ?
Post by: merkland on May 16, 2008, 04:49:33 PM
Having seen the reference to the Magnetek Aurora above I thought I would check it out in the course of which I came across this item: http://www.power-one.com/resources/AlternativeEnergy/mwiuk2.pdf
It looks like the ideal inverter, grid-tie or stand-alone with multiple inputs - wind/solar/battery/ generator.
Where is the catch apart from it not stating G83 compliance?
I have not established what it would cost, probably need a mortgage to buy one! ;D


Title: Re: Grid Inverters, are there any worth buying ?
Post by: dhaslam on May 16, 2008, 04:57:39 PM
They don't seem all that expensive, at least in the US.   5Kw  may be a bit limiting.   

www.solacity.com/Pricing.htm


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on May 21, 2008, 01:20:40 PM
Hi
I got a price from power one for the 3.6KW version for wind use.  Came to around 1500 plus VAT I guess.  The big plus point as far as I can see for this inverter is that it will start working with as little as 50V on its input.  The others I have come across seem to need at least 150V.  This makes it much more suitable for wind turbine use.  One system I came across had a turbine that had an output of up to 200V and an inverter that needed at least 175V to start working!  So will spend much of it's time spinning but not producing any electricity.

I am about to order (subject to network provider permission to connect) a 5KW turbine complete with 6KW Aurora inverter.

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: Alan on May 21, 2008, 03:11:52 PM
Hello Paul

Not had time to look into spec / details of  the Aurora inverters

Will you end up with the ability to change parameters in the inverter.

Or do they try to interpret the voltage / wind speed curve and enter curve / current  for you.

It would be far better if you can change software your self.

Will try to look later.

Regards

Alan


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on May 22, 2008, 11:15:20 AM
Hi Alan

Dont know if I will have access to the parameters yet ( I hope so, being an electronics engineer!).  The company supplying the kit are local to me (5 miles away) and want to connect it to the web so they can monitor performance and I assume tweak the settings remotely.

Will keep you posted.

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: Alan on June 09, 2008, 04:42:17 PM
Hello Paul

Hope you have more success with the Power One inverter than I am having. After lots of bounced E Mails. Been told availability ( Maybe end of summer ) Wot A Way To Run A Company.

Regards

Alan

P.S.  The Power One 6 K.W. has not got G83 certification.


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on June 12, 2008, 09:39:51 AM
Hello Alan

My installer is getting the 6KW Magnatec Inverter from a company in Milton Keynes, they have one in stock.  I am told it is G83 certified and Central Networks have given me permission to connect it to the grid.

Will keep you posted.

Regards

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: Alan on June 12, 2008, 11:19:49 PM
Hello Paul

I spoke to the U.K. sales engineer for Power One ( Magnatec ) Paul Meham. ( sorry for Spelling ) He said the 6 K.W. has not got G83 approval. He also said I could not purchase any equipment until the end of the summer.

The specification of the equipment looks good. But I could produce a sales Blerb.

Regards

Alan


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on June 17, 2008, 10:10:38 AM
Hi Alan

This is all a bit strange.  My installer is off to somewhere in Milton Keynes today to pick up a 6KW Magnatec Aurora inverter!!  I'll try and find out who he is getting it from.  He also says he has a copy of the G83 approval! (this has just been obtained).  Central Networks have given me permission to connect it regardless.

Will keep you updated.

Best regards

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on June 18, 2008, 09:58:46 AM
Hello Alan

I spoke to my installer last night.  He is getting the 6KW Aurora inverter from Magnetek in Milton Keynes.

I have been looking on the web again and now cannot decide who makes it!! Is it made by Magnetek or Power One?!!!

Anyway, my installer has been over and seen it and was very impressed.

Installation starts on the 1st July. (I have already poured the foundations).

Regards

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on July 11, 2008, 12:46:37 PM
Hi All

My 5KW system is now up and running.  I will post some output figures soon.  I have a 6KW Aurora inverter.  It is the first one my installers have used.  They have always used SMA products in the past.  They are quite impressed that with it's input voltage down at less than 50V it is still putting power into the grid (not much but it all helps).  This was with the wind speed hovering around 2 M/S.  Peak output power so far, it was gusty earlier in the week, is 5.8 KW.

All looking good so far.

Regards

Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: northern installer on August 12, 2008, 11:28:43 AM
According to 'electronic specifier'magazine,12th august,power one has bought magnetek.
Paulg,how is your aurora performing?


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on August 13, 2008, 03:24:16 PM
Hi Northern Installer,

Although Power One bought some of Magnateks business I am under the impression they sold them back the renewable energy part of it.

I am very impressed with the Aurora.  It has a DC-DC converter built in so it's operational input voltage range is impressive, if the turbine is rotating then power is being put into the grid.  The turbine doesn't freewheel.  It has the Aurora wind interface between it and the turbine as we chose not to rely on the Chinese controller.  The wind interface controls the dump load.
Unfortunately the Chinese controller had a lot of 'teething troubles' and has only recently been sorted.  I am in the process of designing my own controller to replace this.

I will post some figures once it has been running for a while but it seems to be performing well now.

All the best


Paul


Title: Re: Grid Inverters, are there any worth buying ?
Post by: ecogeorge on August 13, 2008, 10:53:00 PM
Please Sir , can we have some photo's ??

rgds George.


Title: Re: Grid Inverters, are there any worth buying ?
Post by: paulg25 on August 14, 2008, 08:53:34 AM
Hi
I couldnt work out how to post photos!!  There are some at this link http://www.flickr.com/photos/28245117@N05/2635572827/in/photostream/

I still have to take some of the control system.

Paul