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Forum Index : Windmills : ideas for my unused 24v system-> grid
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| rgormley Senior Member  Joined: 22/02/2006 Location: AustraliaPosts: 245 |
Since i have had my 2kw grid tie system installed, i have not been using my other 24 volt wind/batt/inverter other that to keep the bats topped up so any ideas on how i can incorporate this system to feed back to the grid? instead of wasting the wind power i harvest. specs are a 24v 250watt jaycar wind turbine 24v batt bank 400AH 3kw cont/6peak square wave (modified)inverter maybe one of those EBAY small 24v-240 250watt portable units that plug back into a main socket? (with island protection) Thanks... Richard any thoughts? |
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| phred01 Newbie  Joined: 16/09/2009 Location: Posts: 10 |
not a simple exercise and changes to grid connect will need to be done by a sparkie with solar accreditation. Basically the 24dc will need to be upscaled to match the DC voltage the solar panels produce. U will also need to ensure the grid connect inverter can handle the extra 250w |
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
phred, The 250w unit he talks of would run parallel to and be independent of the main inverter... it is a free standing grid tie inverter in it's own right, and will piggyback well.... it plugs into a power outlet so no hard wiring. The main difficulty will be the power company. The fine print that describes what power is acceptable under your agreement. If they are paying a special "solar rebate", and you add wind to it... it may be a hanging offense. Putting aside the legality, and focusing on the practical only. 1. Yes the 250w grid tie is simple and direct and would work out of the box. 2. you could use your mod inverter to bring your 24v dc up to 240v ac, and transform and rectify to your desired voltage for the main grid tie inverter and drive it at night... when it has no solar input anyway. (need isolation diodes to prevent driving the solar array though) Number 1. will require the appropriate certification... and may transgress your agreement. Number 2 may transgress your agreement. So practically very simple, but the red tape may strangle it in practice. .........oztules Village idiot...or... just another hack out of his depth |
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fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
I would be more concerned with keeping the batterys in service and use it all as a back up/power supply for lighting and some other light loads . Is a chinese 250w mill realistically worth spending the effort and money on to connect it to the grid ? PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| rgormley Senior Member Joined: 22/02/2006 Location: AustraliaPosts: 245 |
"you could use your mod inverter to bring your 24v dc up to 240v ac, and transform and rectify to your desired voltage for the main grid tie inverter and drive it at night... when it has no solar input anyway. (need isolation diodes to prevent driving the solar array though)" hhmm so if at night i hooked my 3 kw modified sine inverter to the panels (via blocking diodes) and rectified and smoothed DC. Question: 1: would the inverter just pump the maximum wattage of the inverter to the grid tie inverter until the batts gave out. as in just go hard on at 3kw till batts died (invert low volt drop out) i don't understand what will/how the wattage will be controlled going into the grid tied fronius unit. i don't want to blow the fronius (IG30) or kill my modified 3kw unit. hhhmmm......  |
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KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
I like the 12V 300V inverter idea myself, stand alone. Give it a go and let me know how it works. must be the "moonlight" thats pumping in the power to the grid!! Karl  Luck favours the well prepared |
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| rgormley Senior Member Joined: 22/02/2006 Location: AustraliaPosts: 245 |
must be the "moonlight" thats pumping in the power to the grid!! funny.... no i have a wind turbine up attached to my other off grid system. So anyone got answers as to how i would connect the off grid inverter to the fronius? (with it letting out smoke?) |
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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi Richard, The most important measurement, that will be provided from the Fronius display, is the solar DC input voltage during operation. [not open cct panel voltage]. Gordon. become more energy aware |
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marcwolf Senior Member Joined: 08/06/2009 Location: AustraliaPosts: 119 |
Hi I have been thinking the same thing for several months. A few days ago I finally got my solar system installed and by watching the voltage generated it is around 174VDC I also plan in the future to put some more cells up so to increase the overall system as the invertor can handle upto 2KW and I only have a 1KW array. I am also working on a dual stator F&P and trying to work out how to tie that into the grid as well. There is a lot of work trying to do voltage matches. If you have a windy day then you can either store the power in batteries and feed it out at night. Unfortunately you will need lots of storage :> Likewise if you have a windy night you can do the same by trying to feed the same voltage (somehow getting 174VDC approx) so to feed the inverter and likewise trying to get it working. I am slowly coming around to the idea that it is best to leave both systems seperate - less to change on the solar system, and you have more flexibility re the Wind system. The little 300W invertors look very interesting there. As they are grid-tie ones they will auto detect the phase of the mains (think you have 2 sine waves and you have to syncronise them together) and make it much easier to fit in. With a little (ahem) subtifuge you can hide where the 300W invertors plug into the mains so not to annoy the electricity meter man. Plus they will handle upto 28VDC input so that opens the 24V F&P configutations very nicely with 2 x 12V car batteries for smoothing etc. Plus you have some expandability too by just adding additional 300W invertors. One thing I do not know if you could hook the two invertors up in series so to handle 48VDc in however I expect you will have a lot of issues re floating earths. Hope this helps Dave Coding Coding Coding.. Keep those keyboards coding.. RAW CODE!!!!! |
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| fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Hi Dave , By far the easiest system to install is a PVE 1200 Latronics 48v , it is built on the sunshine cost and is approved for use in Aus and of course has an Aus warranty , 5yrs I think . They might cost more at the start but will also give you the ability to expand in the future . Some times trying what seems to be cheaper options , can end up costing twice as much PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
Thats right Phill rub it in......my mill already owes me $600 and its literally half your 'mill with just one stator.... DOH DOH DOH..... soon.....the Phill mill for me! Luck favours the well prepared |
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| marcwolf Senior Member Joined: 08/06/2009 Location: AustraliaPosts: 119 |
Hi Phil I can understand the arguement of qualityVquanity but with the PVE 1200 I get 1200W for about $2000 With the littleinvertorsI get about 300W at $200. As most information I can see a F&P systemwill generally get around 600W output so basically a $400willgive me the invertor capacity I need. With the Latronics Iwill still have a lotof excess capacity that I cannot really use or generate with unless I get two F&P systems to go. Then I have the additional cost of rectifier units, voltage doublers for low RPM use, and batteries for excess storage etc. True theLatrobics is a very nice beasty but for me it is like getting a full scale SUV when all I really want is an old ute for the back paddock :> Take Care Dave Coding Coding Coding.. Keep those keyboards coding.. RAW CODE!!!!! |
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