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 email@example.com
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.