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Forum Index : Electronics : Backshed Piclog - This is great stuff
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SparWeb Senior Member  Joined: 17/04/2008 Location: CanadaPosts: 196 |
Lots of wind all day; a new weather system is rolling in. Knowing it was coming, I left the data logger running all day. I came home after work to see this: 
Sorry graphic isn't very clear: the PicLog had recorded 3667 WattHours, and that was only at 7 PM. It's about 11PM, now, and the count just crossed over 5000 Whrs. That's the most energy I've ever recorded collecting in a day. It's about a quarter of my house's daily consumption. Thanks again to they boys in the Backshed for designing a datalogger so easy to build. Steven T. Fahey |
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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi sparweb, a mill doing 1000rpm. this is a screamer. I assume as the battery is at 27.5V, that much of this power has gone to diversion loads. Gordon. become more energy aware |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hey Sparweb Glad to see the Piclog is working for you. That RPM AC measurement can be a bit tricky to get right. Thats good power your making. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
lets see... 1050 rpm, 8' prop and 36kph wind..... thats ... 12.5 TSR. So,1/tsr=.079 Atan of that is about 4.5... subtract the tip angle (maybe 4 deg....) So .5 degree angle of attack.. I think your well out of stall 
Or, methinks there's still some filtering to be done on the rpm side of things. Nice to see it working well for you. Your workmanship is a pleasure to see (had to ferret out the prop size from F/L).. nicely shaped prop. (seen from the cheap stalls here.) That will light a big string of LEDs on the Christmas pole this year (are we doing it again?), or keep the horses in hot water for a while in the manner they've become accustomed to recently. 
..........oztules Village idiot...or... just another hack out of his depth |
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| Dinges Senior Member Joined: 04/01/2008 Location: AlbaniaPosts: 510 |
Is it the 3hp conversion that's producing all that power? 5kWh/day...Very nice! Would be enough to satisfy 80% of my power use. And that includes electric waterheating 
Moments like these that makes one proud of the fruits of all that hard work eh? But... think of all the things you could power with a 15' 10hp conversion at windspeeds of 36 km/h; about 20kWh/day energy! The horse's water would be hot enough to make tea 
Peter. |
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| SparWeb Senior Member Joined: 17/04/2008 Location: CanadaPosts: 196 |
HEHE! 
I knew that RPM would catch your eyes. Yes indeed filtering is necessary when reading the AC directly. One moment it's 540 RPM, the next moment it's 1050. Audibly nothing's sped up, no increase in output, and this motor conversion does not have reactance-limiting that would make it possible to obtain 500 Watts at 500 RPM and 1000 RPM. Someday I'll put a hall sensor or a reed switch up there, but for now it's too easy to just tap the AC. Yes, too, about the 27.5 voltage: the water trough heat was ON @ 1500W. Plus all barn lights I was sucking about 100 Amps out of the batteries. Maybe I should get those christmas lights up again! Tea for the horses! Hot baths! What luxury!
Steven T. Fahey |
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| GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi sparweb, the piclogs that I made, and phill has 2, do not seem to have linearity problems, or noise pickup. I used a slightly different technique to Gizmo, as I did not want to make a direct copy. Remember the F&P, that phill has, has an output frequency of 28cycles per rotor revolution. His setup is 48V as well. He has said that the sensing drops out below 10rpm. I would expect problems at low rpm, and not at the higher rpm. Gordon. become more energy aware |
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| SparWeb Senior Member Joined: 17/04/2008 Location: CanadaPosts: 196 |
4 pole motor conversion. Low Low bargain basement frequency. At 500 RPM the frequency of the AC output is about 33 Hz. I haven't seen many oscilloscope traces of motor conversions electrically loaded and charging batteries, but from what I can tell there will be a spike at every ON in the diodes, and it might also be that the zero-crossing isn't a clean transition, either. Troublesome waveform, not trouble with the PicLog. It's great. Steven T. Fahey |
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| GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi sparweb, the spike if there, should only affect the rpm signals, if there is low sensitivity in the current to the opto-coupler LED. Gordon. become more energy aware |
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| Dinges Senior Member Joined: 04/01/2008 Location: AlbaniaPosts: 510 |
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