Anybody have experience with MM3000 grid-tie unit?

 These were discontinued and apparently the MM5000 %KW unit had some
problems. I would appreciate any information on them you can provide me.

Thanks

 

The search I did came up with an MM3000. I know of no where that a utility
will allow you to just produce 120 volts for the grid.

Grid tieing is usually requires the producer to install and maintain all of
the equipment for producing power back into the grid. I have done estimates
for customers and the break even seems to be around a megawatt. Depending on
your local epa requirements. Anyone can have a generator for standby or
emergency power. When I comes to prime power my county wants to know how
much pollution your going to produce monthly. This requires sensors and
inspections.

I applaud your thoughts but stand alone or load shedding is an much more
satisfactory way to produce electricity. Besides unless your in an high rate
area it is impossible to buy, maintain, and feed a generator for what you
can buy from the utility.


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 The lopsided 120V only is a good point but I wasn't going for reselling of
power to the utility.

I do not know where or how you arrived at a 1MW figure. Even at 2.5MW
windmills the price per kWH is much more expensive than our 4.3 cents per
kWH here. The published latest figures I have seen are about 13-20 cents US
per kWH on large installations. The unit I have in mind is only 3kW and I
would use it for grid tie, only for convenience and hobby.

I am a Protection & Control Tech by profession and have experience with
control systems and have an offer to buy a MM3000 cheap in order to further
my interests. I did not come up with much info for MM3000 and I was
wondering if anybody heard of some good or bad.

I guess I am still wondering.

Thanx



estimates

 

My experience with electrical installations is where I came up with the 1 MW
figure. I have lots of customers with installed gensets that are in the 1-10
MW figure in CA. They use the exhaust heat as well as the power for
peak/load shaving.  These are all industries that if an power outage
occurred it would cost a lot of money for the damaged product.
One paper printing outfit in the LA basin has 30 MW of capacity. They
typically run their gensets at about 10-30 MW depending on the time of
day/season. They have 4 different times/billing segments to their bill.
High peak, mid peak, average peak, low peak.  Then there are summer and
winter rates. Summer time they run higher and winter lower.

I had a customer in AZ that had an 950 KW genset. I did the proposal for
allowing them to parallel into the grid. The power company was the one that
put the bug in them.
Once all of the electrical switch gear was modified to suit the electrical
utility. The change was going to cost well over $300K.  Not worth it at all.
I did get something positive done. The utility required "an visible blade
disconnect". I found that no one made an visible blade disconnect made by
any manufacture. So the utility finally changed the regulation to include
rack outable breakers.

My experience does lie in fueled generators and their related equipment.


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 Speaking of grid tie..... I've been interested in getting a cogen nat
gas unit installed in our house. (old victorian with hydronic heat, so
we have a place for the excess BTUs. ;)

They sent the relevant requirements for getting a grid tie with net
metering system.  I've only browsed though it briefly... but there
seemed to be alot to do.

(The way they set the thing up, it's possible that i wouldn't even be
able to do it with the nat gas unit....only renewable resources.)


They included the visible blade external switch (Actually i'm
remembering visible "break" switch... but i could be misremembering)
They also included various things like an active monitor of
frequency/voltage/etc that disconnected automatically, but could only
be reconnected manually.  The voltage/freq/etc specs seemed to be
written "different from line" vrs absolute (240V/60Hz).  This seems to
imply to me that if they had an under/overvoltage, I would be required
to disconnect my supply.  Of course, this makes more sense for me,
since it would protect my equipment as well.

I asked the guy if anyone had actually done this, and he said:
"No... When people find out what all they have to do, they usually
make the connection without bothering with the net metering."

I can see them wanting to have an external disconnect.
I can see US wanting to have and Automatic Transfer switch.
I can understand them wanting to have matching power fed to the grid.
(note matching does not mean "clean")

I do remember reading an account of one guy's experience on the
web... his was a solar setup.... but I don't remember all the
failsafes he had to put into the system.

So, those who actually went through with grid tie:
How much did you have to do to get tied in, and is there an out of the
box solution that sememd to cover most of the requirements?
(I realize your requirements might be different than mine... that's
ok... I may not have represented/remembered all my requirements)

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be safe.
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