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Forum Index : Solar : using motor for MPPT
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| isochronic Guru  Joined: 21/01/2012 Location: AustraliaPosts: 689 |
Just a thought. A small motor running unloaded will develop a back emf and restrict its current. So, one in series with a solar panel should throttle the current back and so make the panel boost the voltage upa few volts, maybe enough to move to approx MPP (?), of course suitable motor parameters should be used. It could even be used as a fan, to cool the panel a bit. (??) |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
That sounds a bit like fitting a generator, driven by a wheel, to an all electric car to charge the battery that powers the wheel in the first place.   Klaus |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
I had to read your post a few times Chronic. I think the idea has merit  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 |
Not sure about this Gizmo.The aim of the mppt is to deliver more power into the load by having the loads impedance rise with voltage and current remain the same or similar.....not a normal load. Or using the extra forcing voltage with the available panel current to a voltage above the load ( 12v batt but 18v available) but used by it??? ( buck converter )..... ie it is the load that we are interested in only. The panel will do what the load allows it. So given a current source ( panel ), it is not much use lowering the thing( current) it actually is, and then simultaneously lowering the voltage across the load by introducing a synchronous impedance to soak up the voltage and lower the current. The load will not get any benefit at all, but it will be true that the power in the panel may be larger than without the motor in series..... bit like matching the load with a mill using a resistor in series, but this time there is no pay off from higher tsr and escaping out of stall to make up for the losses. A pwm and a motor make a very useful buck converter with a panel, but then the motor "is" the load.... thats not what we are talking about here I suspect. I may be still missing something though. ........oztules Village idiot...or... just another hack out of his depth |
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