[RE-wrenches] Using a Midnite Classic for Hydro

[jay peltz]

HI All,

Here are a number of issues and fixes for this problem.

1. Order up a lower voltage stator from Denis at Harris Hydro. That way it won't go above the 250voc.  Depending on head/flow/wire it might be the easy fix.
2. The turbine will produce higher VOC with more water feeding it.
3. You can't treat a turbine like PV.  You have to set the CC to NOT regulate.  IE you set the CC set points to 66v then it won't regulate.
That way it'll stay connected.  But there are times that you could run into trouble.  If you have a specific set of conditions and the OCP trips for example on the classic, then it'll go VOC and while it probably won't damage the classic with a 48v system it will never reconnect.
Or if someone turns on the hydro too fast, it might not connect.
4. Yes you can install the clipper ( its the right thing to do) as this will prevent the problem from happening.  its the cost of doing biz.
5. Its really really really hard on the turbine to spin it at VOC.  Tears up bearings.  If the bearings go, then it'll wobble, then it'll start to wear into the magnets and then its toast. Can happen fast.
6. Yes installing the diversion controller/DC load on the output breaker of the CC is also correct.  But that is for another reason, its to prevent problems IE VOC if someone disconnects the batteries or the breaker trips or someone ( or something like the cat) trips the CC output breaker. Because if the CC somehow has an issue then it'll never get to the diversion controller, and the turbine goes VOC
7.Other options.  Run it 3 phase AC to a transformer/rectifier box to some lower voltage then you won't have this issue with going above the  VOC of the CC.
8. Other option.  You can run the CC set points 5v above what you want and then run AUX 2 5v below ( or what you actually want) and then connect the AUX 2 to the dump load.  So it'll dump as the bulk/absorb/float.  
So the CC will never disconnect, but the diversion load will act like it is.

There are more options but thats enough for now.

Hope this helps.

jay
peltz power







On Mar 19, 2015, at 3:56 PM, "Jeff Oldham" <starpower4u at juno.com> wrote:

> Thanks Bob and all for the feedback. I would prefer to avoid the hassle and expense of the Triac's and gutting the hydro to remove the rectification for an AC output. We are not sure what the actual VOC freewheeling potential is because it was shutdown when it soared to 253V quickly as he did not want to smoke the Classic. I'm not thrilled about reducing jet flow rates to control VOC because that also means a reduction in output.
>  
> Does anyone see any issue with my thought of setting the Classic setpoints comfortably above all Solar FM60 setpoints and letting the lower settings driving the AUX do the charge regulation via load dump? Is this just too simple and easy to be a effective solution?
>  
> The load dump is a custom heater in the customers bathroom that he desires to get the most heat possible. Thus not wanting to limit hydro production that is not all that large to begin with.
>  
> With continued appreciation,
>  
> -jeff
> 
> 
> From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative SOLutions
> 
> 
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