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Forum Index : Windmills : Technical and electeonic information
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marcwolf Senior Member  Joined: 08/06/2009 Location: AustraliaPosts: 119 |
Hi Folks Well - my solar panel system has now been installed and it is sitting up there generating 870W as we speak (type?) As I have had to put my wind generator on the back burner until this was installed I am now starting it up again. Now the solar panels puts out about 170V depending on lighting conditions so they are wired in series. The Invertor needs a minimum of 100V to start and can handle upto 500V. As the invertor is a 2000W and my panels are rated max 1000W I have some extra conversion capacity. So here are some very technical questions re power and current that need some help with. I have 2 isolated circuits both producing DC. Each circuit is isolated from the other with a set of heavy duty diodes. Circuit 1 makes 170V DV approx at 5A Circuit 2 makes 120V DV approx at 4A If I join the two circuits together what voltage will I be getting and what amps. Remember that the two circuits cannot back-feed each other. Also - for a tower - round tubing or box tubing?. I can get various quality of 4" diameter tubing and I was wonder what might be the best. Many thanks for any advice 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 , Good to here your solar is up and running , as far as the converting up to that voltage and combining it with the solar I am sure there are some here that can advise on that . I would be going with the round for a tower . PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| marcwolf Senior Member Joined: 08/06/2009 Location: AustraliaPosts: 119 |
Hi Phil I am planning to give you a call soon re getting some parts to make the rest of the windmill. Anyway - I have 2 choices re generating the power. I can run the F&P almost in native mode and use voltage doublers to get the 100V+ Or alternately I have a 12V to 110V 1KW invertor here that I can modify to give 100V+ DC out and make the F&P generate 12V to feed it. Oh decisions.. decisions :> I am not that worried about a little loss, jusr a way to suppliment the solar when the sun don't shine. Take Care Dave Coding Coding Coding.. Keep those keyboards coding.. RAW CODE!!!!! |
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| RossW Guru Joined: 25/02/2006 Location: AustraliaPosts: 495 |
Unless there's something else going on you haven't described, you will find that circuit 1 will be providing 5A at 170V and circuit 2 will be providing NOTHING. If circuit 1 is the PV array, as the sun goes down and its voltage drops - once it gets to 120V, you will get current from both circuits. Once circuit 1 drops below the voltage of circuit 2, your combined output will be 120V at 4A. There will be a *LITTLE* wiggle room there as the resistance of cabling, characteristics of the diodes etc, will let the two circuits share better when their voltages are VERY CLOSE TOGETHER, but simply diode-ORing them as you described won't give you what I think you wanted (eg, they won't give you 9A!) |
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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi Dave, it would be better if you gave a bit more info. For instance, if the loading could pull down to 120V, then you would get the 9A at 120V. I spen a lot of time on my own parallel supplies feeding an inverter, and it is all about matching. Gordon. become more energy aware |
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| marcwolf Senior Member Joined: 08/06/2009 Location: AustraliaPosts: 119 |
Hi all. Thanks for replying. I will try and give more information. Ok - Circuit 1 is the Solar panels. They of course fluctuate depending on the sun conditions down to where they produce nothing when it is dark. Circuit 2 will be the F&P. I have been given a 12VDC to 110VAC 1KW invertor. I am planning to use the F&P plus some buffer batteries to feed this invertor. I will then take the output and rectify it with a full bridge to make 110DC (I will also be having capacitors etc for filtering) I would like to combine the power from both circuits into the main invertor. As both circuit will not be 'stable' as in I can relay on Circuit 2 being on or off. Circuit 1 will be changing a lot depending on sunlight etc. I could get another invertor for circuit 2 but the difficulty in hooking it into the 240VAC will make costing impratical. I prefer not to have to buy another $2000+ Grid invertos and the cheaper invertors will have trouble matching the 50HZ frequencies. Hopes this give enough information Dave p.s. My Grid invertors is a CMS2000. I have 6 solar cells. At 10am this morning I was gettin 174VDC 5A. Coding Coding Coding.. Keep those keyboards coding.. RAW CODE!!!!! |
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