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Forum Index : Windmills : Wind Generator
| Author | Message | ||||
joyt12k Regular Member  Joined: 12/05/2009 Location: AustraliaPosts: 49 |
Hi everyone, I need some expert advice please. I have aquired a f&p already wired for 12v and have just made up a bridge rectifier to convert 3 phase ac to dc (is that 12v ?)The wind generators been up for months now, and I would like to connect it all this weekend. The grid tie inverter will only accept between 20v and 55v. Would I be better off wiring it up as 24v ? And would the bridge rectifier be the same? Also I only have a multimeter to check figures, is that ok? Thank you for any replies. jasmine |
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DTV004 Regular Member Joined: 30/04/2009 Location: United StatesPosts: 65 |
yes but 24v inverter to 120v is more money and 12v more cheap to setup. 6 battery's 6v each is much bater than 12v |
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GWatPE Senior Member  Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi joyt12k, the rectifiers will likely be OK for a 24V setup. What protection systems do you have in place for the GTI? Gordon. become more energy aware |
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| joyt12k Regular Member Joined: 12/05/2009 Location: AustraliaPosts: 49 |
Hi Gordon It's a Powerjack 600 watt GTI. It has an island protection which switches off when theres a power cut. Originally I wanted to connect everything to the solar panel inverter, but that was too hard and costly. I don't know what to expect, until I connect up and take mesurements. It seems logical that 12 volts is nowhere near 20 to 55 but I do know that over 55v will blow the inverter, therefore I need to adjust the furling. jasmine |
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fillm Guru  Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Hi Jasmine, I would be thinking along the lines of a small 24v battery bank to stabilize the voltage to the GTI as well as a form of voltage regulation / dump load , if the grid is off and your mill is going and it can not be shut down then you will damage the batteries . Because the GTI goes down to 20v a relay that disconnects and connects at 24.5v would be good to keep a full charge . I would think if you are trying to direct couple the windmill to the GTI that will blow at 55v , then thats what it will do . PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi Jasmine, The GTI powerjack600 is on EBay. All the units seem to be 110VAC connection. GTI of this type will attempt to provide full loading at the 20V level, all the way up to 55V. Only the current will decrease as the voltage rises, to maintain the 600W. These units are designed for a solar connection, with a maximizing function to power point track the array. Windmills have completely different power curves. You will need some windmill loading matching device, in addition to overvoltage protection. I see no simple solution that optimizes what you have, from the info you have provided. Gordon. become more energy aware |
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| joyt12k Regular Member Joined: 12/05/2009 Location: AustraliaPosts: 49 |
I have double checked this one is definitely marked 220v and the paper work says ones marked with 220v will put out between 190v & 250v. It also says solar panel or wind turbine. Iseem to remember on the ebay site they said it would'nt work with batteries. I did talk to the bloke in China and asked several questions before buying it. As long as I can furl the mill before it reaches anyway near 55v. would'nt that be ok? I had'nt considered the power being off and the mill still going, I will have to look into it. I was hoping to connect as the diagram shows mill-rectifier-inverter-grid. jasmine |
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KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
i reckon you could on on a winner if you follow Gordons advice and take care of it in case of grid failure BUT the devil is in the detail, getting this right might as he suggests force you into bateries and a 24V bank is going to be stuffed running down to 20V regularly, similarly an F&p will generall make double its rated voltage unloaded, so even wired for 24V could make well over the 55V rating. Good luck fingers crossed from all of us as this is the light for most of us ie a GTI for a couple of hundred bucks that can be stacked. Luck favours the well prepared |
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