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Forum Index : Windmills : OEM mills
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| VK4AYQ Guru  Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Norcold I use the extra rectifiers to fully isolate the modules as they are inclined to feedback when on the same rectifier, also if you put them on the main rectifier they will try to run on a back feed from the battery, some on the output they need to be isolated from each other and it also smooths the transition from the boost module to the main rectifier during heavy wind. To be hooked in series on the output using lower output modules they need to be on separate rectifiers for a 60 volt one they do not need to be in separate rectifiers. getting the same wind is a problem for sure they would need to be close together 3 times the prop diameter. I have ordered some more rectifiers to try a rectifier doubler on a 12 volt mill I have so I will let you know how that goes. Go catch me a Barra. All the best Bob Foolin Around |
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norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
Got around to taking a few photo`s 
The 200w Jaycar is in foreground, the OEM`s at rear. 200w and lower OEM are on 10m poles the higher OEM is at 12m. The towers appears in photo out of vertical but not so this is an optical illusion. Have all 3 mills on cap-doublers now(as per Gordon`s diagrahm Phils`s caps & rectifiers), best performance at 27km winds 1 OEM`s output 8amps , 200w jaycar 6amps. Recorded using a Mastech MS2108A clamp meter set to give a maximium reading over a period. Ensured both mills were recorded when winds hit 27km/hr. The wind speed recorded by a Sinometer Weather Station.1 OEM has 46m of 2.5mmsq other 40m of 2.5mmsq, 200w has 30m of 1.5mmsq, cable to rectifiers. Contrary to Phill`s logging I do not believe the OEM`s are capable of 1300watts with cap-trebler or doubler into a 48v system. Not even for a brief period under cyclonic conditions. That is 1300/55=23.8amps. Into a 12v system no trouble, the caps load the mills up to much in a 48v system, without the multiplier there would be little output. I agree logging is the way to go, but the logging needs a standard for it to be meaningfull. I do not believe there is any attempt here to misinform I just believe there is an error in the logging, and I accept we will probably agree to disagree on this. The batteries in system weight 1100 plus kg, mills control box is smaller one with 3 digital panel ammeters on top of power box that houses solar regulator etc. 3 Phase swithces are used to brake mills except in the 200w mill, in this case switch is used to switch output into 12v system or 48v system. Interestingly when switched to 12v the doubler is still outputting a litle current into 48v system, with a trebler the 200w mill would brake immediately when switched to 12v. Experimented with the 10v-60v boosters, with and without doublers. Whilst they do work and with more experimenting would probably get better results, I believe they would add complexity to the system when I require for safety and reliability, simplicity. Will continue to monitor Phill`s OEM on internet, taking particular notice of the ampere readings. Especially output with different capacity caps. We come from the land downunder. Vic |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Vic I believe the lack of top end drive in your case is the fact that you are running in star configuration, while this cuts in lower it removes a lot of drive from the alternator across the board and particually at the higher wind speeds it cuts power out by nearly half, the machines are well and truly capable of producing high voltage in higher winds when in delta, mine produced over 100 volts not sure what at the meter pegged at 100 volts, when the amp meter shunt blew at 50 amps, (furling wasn't quick enough). The caps help the mid range but not a lot of power out even on 24 volts. The star helps to bring the mill on at lower speed but looses out on resistant losses as the amps come up. I have ordered some 150 watt boost modules to try so will post that when I get it going. As for reliability the boost modules working at the bottom end of their range should be as reliable as electronics can be as there isn't much in them. two extra rectifiers and that's it, I am putting together a 48 volt system to play with in the next few weeks, I have a spare set of batteries and ordered some boosters now just have to bite the bullet and get the next mill. Mine will be 3 meter dia blades as is this one as that helps to drive the boost modules at low wind speeds. All summed up a solar array is the best on my location due to low wind speed but nowhere near as interesting. On my Chinese mill the cap doubler made very little difference as the lower frequency of the mill would require much higher capacity in the caps. The boost modules work well on it as it used to spend a lot of time doing nothing but now when it gets going it makes power too. All the best Bob Foolin Around |
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| norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
Just double checked unloaded voltage at 20km/hr I`m only getting 52volts across either phase on both mills. ie. unloaded. Frequency 280Hz. Checked templates(3 of) for blade angle of attack that is correct, question? Bob & Phill could you check unloaded voltage and frequency? If yours are producing higher voltage and frequency at 20km/hr(approx), than I have a problem in achieving high RPM in both mills. Would much appreciate because after monitoring your logging Phill I realise I have a pretty good wind site. We come from the land downunder. Vic |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Vic I will check mine next time I get some wind, once this rain front goes through it should be windy again. Bob Foolin Around |
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| norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
Would really appreciate that Bob, if your voltage is much higher than mine than I will have something to go on. Perhaps as Phill believes it is something I have done or as I believe I must look outside the square for an answer. We come from the land downunder. Vic |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Vic Comparing mine may not be much help as mine is in delta, comparing the test voltages I just did with LG machine the star voltage is 20 to 30 volts higher until the generator loads up and then the resistance losses make the delta voltage higher than the star voltages but not by a lot, Have a look at the LG chart I did, if it is to small to read give me a PM and I will send the spread sheet. All the best Bob Foolin Around |
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fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Hi Vic, I am at work at present and can not do any checking untill next week. A few are areas to check with your set up - *The paint that you used to paint the windings, Does it have metalic properties? *The total restistance through the circuits , measured accross the phases from the rectifier connections, which would include the 40m+ of 2.5mm?. * Did you do anyting with the slip ring connections and wiring ? If you have been following my logging and have noticed an increased performance from about the 25/6/11 , it is because I replaced the caps in the Quaddrupler with a lesser value as the 1600uf were loading to heavy , the doubler is still in parralell. The very low wind output 1.5ms - to 2 ms(once Started 3m/s) has picked up to the point where it almost duplicates the AX but at 20%~30% less most of the time . There are almost no wiring losses from the mills to the batts . I was under the impression that this thread was about tring to get the best out of low wind performance , and I am not out to decieve or bodgy output figures , I try to have my loggers as best as I can and only state what they have recorded in my location with the Mods I have done . PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
Bob, The test voltages with the LG machine chart is no problem to read. Just the unloaded voltage at 20km/hr across one phase will do nicely on the OEM. Being a delta wired mill it should be lower than the star winding.If that is correct than I have a point to proceed from, if not I`ll probably trial one on delta. Having two side by side that are giving similar results except in low wind, than the higher mill shines has helped to prove the best multiplier tried so I imagine it should settle the difference between star and delta. Curious about one thing is the 200w and 500w Jaycar machine the same PMA just with different dia blades. My dia is 1800mm what was the original dia on your 500w mill? Just a thought that may help to explain its outstanding performance on 48v, on a trebler there is no noticable loading up, on a quadropler loads up bad. Does not seem to be affected by cap capacity. Have tried with 4700uf, 2300uf and 1600uf. Have alsp trialled these capacities on the OEM without any noticable difference except the OEM is much happier on a doubler. Interesting thing I`ve mentioned before without the caps the multiplying effect is still there except the caps stop loading up to an extent.ie the rectifiers wired in series on DC side as in case of multiplier. It is like the rectifiers are like connecting batteries in series. Which I suppose is logical. No hurry with voltage test do at your leisure have a few Chivas Regal`s to set the mood. Film, The unloaded AC voltage across one phase and if possible the frequency reading under doubler load at 20km/hr wind will help me. I question the logging not because I believe you are trying to deceive I do not believe that to be the case. The current readings on the logger agree with mine at any particular wind speed. Look at the peak RPM readings at peak wattage readings, should they not correlate ie give fairly close peak wattage readings at a particular peak RPM? On wire sizes check out the reuk online cable reckoner or those on other sites. Copper prices no longer allow us the luxury of going oversize in cable size. If I have excess resistance in line than why does the OEM`s sizzle the 200w on 12v, and why does the brake hold the OEM`s still in high wind? The OEM is a fine mill, one thing I really like about it is it`s weight, and if I was on 12v I`d not be going here. But I`m trying to get it to realise it`s full potential on 48v so as I can go to the expense of higher towers to get amongst the clean wind I now know is up there. But if these points do not seem valid to you than let us agree to disagree, but please give me at least the unloaded voltage on one phase at 20km/hr, disconnect all three wires from rectifier to ensure reading is under same conditions as mine. We come from the land downunder. Vic |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Bob, The test voltages with the LG machine chart is no problem to read. Just the unloaded voltage at 20km/hr across one phase will do nicely on the OEM. Hi Vic The voltages on the LG mill are higher in star at the lower speeds, but the amps output is not much gain, there comes a cross over point where the series resistance in the star winding cancels out any advantage of the higher voltage this seems to happen at 250 rpm or 130 HZ below that the star out performs delta and above delta out performs star. You must remember that they are very different machines as the OEM has lower initial resistance, I will check the diode to diode resistance tomorrow to compare with yours, also mine is 15 meters of two strand 1,6mm lead per phase so possibly has slightly lower transmission resistance. Quote: Being a delta wired mill it should be lower than the star winding.If that is correct than I have a point to proceed from, if not I`ll probably trial one on delta. Having two side by side that are giving similar results except in low wind, than the higher mill shines has helped to prove the best multiplier tried so I imagine it should settle the difference between star and delta. it is initially lower than the delta because of the multiplication factor of star configuration, but as the amps increase the higher series resistance tends to cancel out the higher voltages with resestive losses, above 414 rpm the amps output gets lower and above 540 rpm the voltage goes lower as well. Unfortunately I didn't do a full check on the OEM before I put it up so I cannot be sure that applies across the board, when I get the next one off Phill I will do a more exhaustive testing, with this one I just did enough to satisfy myself that it was happy in delta and would do my job on 24 volts, which it has done with amazing results. Quote: Curious about one thing is the 200w and 500w Jaycar machine the same PMA just with different dia blades. My dia is 1800mm what was the original dia on your 500w mill? Just a thought that may help to explain its outstanding performance on 48v, on a trebler there is no noticable loading up, on a quadropler loads up bad. Does not seem to be affected by cap capacity. Have tried with 4700uf, 2300uf and 1600uf. Have alsp trialled these capacities on the OEM without any noticable difference except the OEM is much happier on a doubler. Interesting thing I`ve mentioned before without the caps the multiplying effect is still there except the caps stop loading up to an extent.ie the rectifiers wired in series on DC side as in case of multiplier. It is like the rectifiers are like connecting batteries in series. Which I suppose is The machines look much the same to me, my machine had 1.8 meter dia extruded blades on it originally which where noisy and useless in low winds above 6.5 MS they worked OK I fitted a 2.5 meter set of a later model machine, it still didn't start at slow speeds but once it got going was OK, but it never has made more then 50 % of the power of the OEM in comparable winds, it needs around 12 ms to get really going and then it is quite normal to see 25 to 30 amps at 30 volts on it, as it doesn't furl it will put out more than the OEM under those conditions as the OEM is well furled by 12 MS. I think the difference between mine and yours is mine is in delta and yours in star ot has more turns of lighter wire and in delta, I have never worked on a 48 volt one. My friend had one and it did 9+ amps before furling. I tried cap doubler on mine but to no avail, As it is a six pole I think the HZ is much lower and would need more capacity so I just put a boost module actually two modules on it to get it working, the final tuning on it is still a work in progress. I tried the two set of rectifiers after you mentioned it a while back but the effect wasn't worth the effort on 24 volts. I am working on another system with a different alternator to get 48 volts, if it looks like being a success I will pass it on to you. It is a 24 volt 1000 watt 8 pole high speed unit with cut in speed of 250 on 24 volts. All the best Bob logical. No hurry with voltage test do at your leisure have a few Chivas Regal`s to set the mood. Film, The unloaded AC voltage across one phase and if possible the frequency reading under doubler load at 20km/hr wind will help me. I question the logging not because I believe you are trying to deceive I do not believe that to be the case. The current readings on the logger agree with mine at any particular wind speed. Look at the peak RPM readings at peak wattage readings, should they not correlate ie give fairly close peak wattage readings at a particular peak RPM? On wire sizes check out the reuk online cable reckoner or those on other sites. Copper prices no longer allow us the luxury of going oversize in cable size. If I have excess resistance in line than why does the OEM`s sizzle the 200w on 12v, and why does the brake hold the OEM`s still in high wind? The OEM is a fine mill, one thing I really like about it is it`s weight, and if I was on 12v I`d not be going here. But I`m trying to get it to realise it`s full potential on 48v so as I can go to the expense of higher towers to get amongst the clean wind I now know is up there. But if these points do not seem valid to you than let us agree to disagree, but please give me at least the unloaded voltage on one phase at 20km/hr, disconnect all three wires from rectifier to ensure reading is under same conditions as mine. Foolin Around |
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| norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
Bob, That about the rectifiers acting sort of like batteries, was just a point of interest something I`d just tried for interest. Actually cooked a rectifier and it wasn`t long after I`d been experimenting thus suspect it had weakend the rectifier. Pretty spectacular when it went, plenty of magic smoke. Initially when I put up the 200w mill I`d used a 1.5mmsq 240v electric lead I had and have never got around to changing. Than I lowered the 200w mill and replaced it with the first OEM, have let the OEM down and put it on it`s own tower with 2.5mmsq since, interesting have not seen any difference in its performance. Strange thing about the 200w mill it to my knowledge has never achieved 200w on 12v but goes out to 300w on 48v. Starting to believe it may be a 500w mill. Its unloaded voltage is suprisingly a little lower than the OEM`s at 20km/hr it achieves 48v. Its frequency is 86 hZ much lower than the OEM`s, from my reading I think that may because of the magnet arrangement in the OEM thus my leaning towards trying a magnet rearrangement. But am not prepared to do this without a spare rotor. We come from the land downunder. Vic |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Vic The thinner wire wouldn't make much difference until a lot of current tries to flow through it, on lower power it will be be much the same as the 2.5mm. What happened to cook the rectifier? it may have damaged a winding if battery amps ran back through the rectifier into the windings. what sort of rectifiers are you using, and is the AC voltage even on all three phases. A lot of the difference in the mills is the ability to produce power is the amps at a loaded voltage at 12 volt 5 amps is only 60 watts but on 48 volts it is nearly 250 watts the amps are limited to a degree by the wire size of the windings, and the transmission wires but the voltage is limited by the rpm of the machine the faster it goes the higher the volts. I have seen mine cook a 50 amp meter in high winds, when the meter went open circuit the volts went up over 100 volts but that was in 30 MS + wind. You need only 38 volts AC to charge at 55 volts. I suspect that you have not had enough wind speed to get 40 odd volts you need and the current limiting of the star connection isn't helping there as it does at lower speeds. Delta is 27 % more efficient at high loading than star. If you have a look at the chart on the LG machine you will see that above 350 rpm it does more in delta increasing as the rpm goes up. This machine has smaller copper windings than the OEM but the magnet arrangement is similar as is the frequency. it does 24 cycles per rev whereas my Chinese mill does 3 cycles per rev. You are mentioning the wind speed at 20 Kl Hr that is only 5.5 MS which would mean without boost module the generator is just starting to charge, mine goes onto the main rectifier at 6.5 MS and gets full output by 10 S and that's on 24 volts, on 48 volts yours would be around around 20% faster to get the higher voltage. The two different machines are totally different design and the OEM needs the higher frequency to get the volts up, do not modify the magnets because it will only make it worse unless, you fit stronger magnets of the same size, and there is no reason for that. it has lots of little magnets where as the 200 watt machine has few but a lot bigger in size. I would try a boost module on each phase on separate rectifiers and a main rectifier to pick up the high speed wind, with the connection is delta to get the higher drive efficiency, this should give you 300 + watts on the three modules and 800 + on the main rectifier when the wind speed comes up, you could use the cap doubler still as it doesn't interfere with the boost modules as it wont start to work until 28 volts DC output If you can hold off until I get another one I will do a few trial set ups on 48 volts to save you more smoke. When Phill gets back from work I will see if he has a spare motor I can play with in the Lathe to trial some ideas, as I want to do a 48 volt system myself. All the best Bob Foolin Around |
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| norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
Bob, Suspect rectifier may had been a little weak from start. Use the 50 & 35 amp 3 phase rectifiers as came with OEM`s, have sourced a few more. The voltage across all phases are the same thus don`t believe I have any damage. 20km/hr is a realistic wind speed to use for comparisions, not much good talking about higher winds when they are only gusting and intermittant at our sites. From monitoring Phils logging my wind site is much more consistant am not far from the proposed Mt Emerald commercial wind site(220MKhr from memory). just seperated by some hills and mountains thats all..... Have a 20m high knob 150m away(downwind) that I`d love to locate the OEM`s on but is inhabited by a family of rock wallabies. My missus being a wild life carer( and I care too, thus the wind interfering trees around my current site), has some issues about that. Interesting bit of info regarding Mt Emerald, the turbines(if the protesters allow it) will be in visual range of an old tin mining battery from the late 1800`s called Rocky Bluffs, historically it had a claim to be the first "town" in QLD to have electrically lit streetlights. They were powered by a water turbine on the Walsh River. We are 200years too late at least to claim to be at the forefront of alternative power as our bloody intellects try to make out. A bloody lot of history in this area. An interesting read can be got from Ion Idriesse`s book "Back of Cairns" or any of his books. About our intellects wonder if their forefathers were the ones that tried to stop Columbus "cause he`d fall off the earth" or suggested the use of gunpowder would destroy the earth. Bob, don`t investigate 48v for my sake. I`m only playing around with wind I know solar is the way to go, thus the way I`ve gone. It`s just passive and works, no noise no heat no drama, just a shame the Govt. doesn`t realise that and see it is the way to go. But than without noise, heat and drama where would they be. Constructive perhaps! Our fathers passed on some good sayings (noted yours) My Dad used to say "No sense taking life to seriously, you don`t get out of it alive"and "youth is wasted on the young" Oh the ramblings of us old farts. Getting a bit off the subject. We come from the land downunder. Vic |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Vic Had some wind this morning so have a few readings, tried the frequency meter but it was not steady so no use, just digits flicking around all over the place. wind speed 6.8 MS 42 volts --- 24 .4 KLMH 20 amps on main rectifier wind speed 5.4 MS 36 volts --- 18.44 KLMH 15 amps across the three wind speed 4.4 MS 30 volts --- 15.84 KLMH wind speed 4.2 MS 29 volts --- 15.10 KLMH wind speed 4.1 MS 28 volts --- 14.71 KLMH Wind speed 3.7 MS 18 volts --- 13.32 KLMH Wind speed 3.4 MS 15.5 volts - 12.24 KLMH This is where cap doubler starts to work Wind Speed 2.7 MS 11.5 volts - 09.72 KLMH Wind speed 2.5 MS 10.5 volts - 09.00 KLMH Wind speed 2.4 MS 8 volts ---- 08.60 KLMH This is where mine cuts in on the booster Unloaded AC in Delta 
This is a snapshot of the wind for the time I took the readings. As you can see there was a fair bit of gust component so it isn't a steady wind reading. After I hooked up the mill again it was doing average 15 amps 30 volts in these conditions. Hope it has been of some use, I feel that Phills Logger would be a more accurate reading than standing there watching meters and writing it down. Fun Isn't it. All the best Bob Foolin Around |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Vic Point noted on our forefathers my grandfather has a water wheel supplying power for the house some 80 years ago and as time goes on we will see more of it and blow the protesters as they will not be to interested if they have no power to run the fridge with the beer in it. We have the opportunity to use more advanced technology these days but people expect to have a decadent lifestyle as far as power goes and even now that isn't practical. All the best Bob Foolin Around |
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| norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
That was more than some help, now I know my 52v at 20km/hr is basically duplicated with yours(allowing mine is wired in star and yours delta). Because I use a weather station to record my wind speed, the sensors are located some 50m from mill thus accuracy was and is no deal. Just knowing our readings are in the same ballpark, tells me I have no problem there, I did consider because my problem was not low wind performance but high wind performance my voltage was down. Now if I look at whether it is because I have too much resistance in cable at higher current loads, I wonder how it kills the 200w in a 12v system where current loads are much higher thus cable resistance would be more of a problem, duplicating your blowing out shunt sort of performance. May be chasing my tail here. Phil`s logger doesn`t (it would serve no purpose) show unloaded voltage but battery voltage. That`s 220Mhr not 220MKhr re Mt Emerald. Should use the preview button. Many Thanks Bob We come from the land downunder. Vic |
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| fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Vic , Came home today to some reasonable wind, I turned the quaddrupler off at 12pm to log the difference with having it in for medium to low wind , the results will more than likely show an increase in performance in the wind I had this afternoon as the loading on the blades is slightly less allowing a higher TSR and better medium wind output, and as the wind dying of tonight the difference will be seen. The quad works well in the 5~12klm range which has been logging since the 25/6 but missed out on the last big wind days that happened when the site was down , I swithched over to Gordons logging program for those days and have some good data. With the piclog averaging over 10min it shows a smoothed overall picture and I usually have 2 or 3 screens open on the laptop at once at the same position and click between them to see the diference or how the average wind compares to the average watts or RPM , and the 500w kit against the AX in low wind, where the auto scaling on the graph needs to be noted when doing this. With the quad + doubler in the 500w tracks the AX very closely in the light wind but does fall behind quickly as the average w/s gets up which is to be expected comparing the costs involved and the development I have put into the AX I would expect that. My battery voltage is held at 52.3V by the 2 x PVE1200 grid inverters, I will see if I can do the unloaded voltage check @ 20klm - my annenometers(Davis Cups) are directly under each mill on the tower. I think an unloaded voltage is better of being measured in a lathe or test rig . I have just completed my test stand for my up and comming AX400 build so I will do an unloaded test on these days off if I have time but 52v unloaded in 20klm does not seem right. Bob - 24V Delta is basicly the same as 48V star in its cut in characteristics, but to go to 48v delta which would have a cutt-in of over 650rpm and an array of boosters etc just to make it work to me seems complicated . From your figures you have quoted it appeares your mill is overloaded in light wind as the cutt-in for the doubler should be well below 3.4m/s which would indicate the booster is clamping the volts and loading the blades, but we have discussed this before and it the path you seem to be going on. Trying to stand there and watch meters and wind/speed is not an accurate form of monitoring windmill performance and as I found it is not untill you have one set up does the real picture get captured " Watt/hrs at the end of the day", I do have a couple of fully completed loggers that Pete built here if you are interested in setting up a logger , you just need an old crappy laptop , I have bought a couple of ebay that work well and it is good to have the older type with a serial port. PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi phil I agree 100% that standing watching isn't as accurate as a logger, I will catch up with you on the logger while you are home. I do think from what I have seen that the mill is more suitable in star for 48 volts but I am happy with the performance in delta for 24 volts and that still includes the doubler, on 48 volts the mill will certainly do its 500 watts as rated and maybe a bit more in higher winds. The little boost module does load the mill in the bottom end but does return power where it wasn't before, may not be as reliable as the caps though, that said I do notice they get quite hot when the doubler is working for a while so It is a matter of how long they last. In my old power supply I just replaced the caps at 25 years so if they do as good as that i wont have to worry about replacing them. All the best Bob Foolin Around |
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| norcold Guru Joined: 06/02/2011 Location: AustraliaPosts: 670 |
Phil, Just the unloaded voltage at 20km/hr or thereabouts would be much appreciated. Although Bob`s voltages allowing for his delta show my mills in the same ballpark, and that basically says it all. Loggers are definately the way to go, check my private emails I inquired could you supply, price etc. You did not respond. Recently purchased a USB Data logger kit from Altronics to do such, just a matter of trying to get my head around scripts etc. You seem to have a belief that I believe the low wind performance of the OEM`s are low. That is not so check my posts. My monitoring of mine shows once the wind gets up the doubler loads up the blades, and because that doesn`t occur on the 200w mill it`s revs increase and push out very similar output as the OEM .It has `1.8m blades the OEM`s 2.74m and 3m. I do not need a logger to tell me I have a problem. Regarding metalic paint, wiring upgrades as stated in an early post they were dealt with in our private emails, I spent 20 odd years manufacturing low voltage refrigeration(Norcold) their is a wee chance I know what I`m on about. But I can agree to disagree, but just one last thing can you please get that unloaded voltage. Doesn`t have to be in a lathe just approx says it all. We come from the land downunder. Vic |
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| fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Vic, Here is what I have measured this morning , the AC is accross a single phase and the DC is out of the rectifier 100Hz - 30vac - 74vdc 124Hz - 37vac - 80vdc 143Hz - 43vac - 90vdc ( this is around 375 rpm in the 15~18klm range) Where you measured 280Hz @ 52v , the blades would have been screaming . If you want to discuss loggers, contact me through private email, you did not persue it at that time so I thought you were not interested. PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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