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Small grid-tie inverters? - Page 16

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Posted by Don Kelly on June 26, 2008, 3:44 am

Sure, that is an old technology. It works quite elegantly and simply but at
low levels it is large, clumsy and inefficient compared to a properly
designed (and connected) grid tie inverter.
Induction generators were (and may still be ) used in Scotland on small
hydro projects.Start the motor (remotely)at no load, open the gates and as
the water takes the speed over synchronous -you have power. I know of one
place where induction motors are used to pump from a reservoir into a canal
feeding a hydro plant (better efficiency of the plant at a constant head)
and when the reservoir was high, running the motors as generators rather
than just spilling into the canal. Note that this utility also used
compressed air to dewater a turbine when the unit was running as a
synchronous capacitor -saving some energy. It was cost effective in both

Note that the machine needs sufficient reactive support from the system to
provide its excitation.

Don Kelly dhky@shawcross.ca
remove the X to answer

Posted by Richard P. on June 21, 2008, 3:57 am
Maury, there is this item that may answer your question:

"Maury Markowitz" wrote in message

Posted by Vaughn Simon on June 21, 2008, 7:49 pm

     Bingo!  Give that man the prize.


Posted by rdaignault on July 18, 2008, 5:31 am

Or check out the SWEA inverter.  It is completely what you are after.
It is compliant in many countries and growing all the time.  I am the
Aussie/NZ distributor.  www.laddertech.com.au, there is a link to Swea

Posted by Vaughn Simon on July 18, 2008, 1:59 pm

   Thanks for bringing that to our attention!  That said, I don't think that it
does exactly what the OP was looking for since he wanted something that would
run from a single 18 volt panel.  The SWEA seems to require higher voltage than
that.  (assuming that I found the correct product...did I?)

   It is nice that someone is making this stuff.  I am honestly tempted to give
it a go myself just for the helluvit, but I would never be able to confess to my
wife what the system really cost vs. how trivial the payback would be.  I would
especially never be able to explain to her why the system would contribute
nothing to our energy needs following a hurricane.


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