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#Post#: 7--------------------------------------------------
300 watt Grid Tie Inverter
By: Corwin Date: March 15, 2013, 1:23 am
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Can you give some information about this? What I am interested
in is:
1) How does this hook into the house wiring?
2) What is the effect on the electric meter?
3) Does it feed power into the grid and offset some of your use
- if you are using no power and the wind of blowing, does power
go into the grid?
4) Do you have to do anything with the power company?
Thanks
#Post#: 8--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: admin Date: March 15, 2013, 7:49 am
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A Grid Tie inverter plugs into any standard 110 outlet in your
house. But instead of using power it sends power into the
house. A Grid tie Inverter is very different from a standard
inverter.
1. It senses if the grid is up, if the grid is down during a
power failure it shuts down. This protects anyone working on
the power lines. This is called "island protection" and is
required by law.
2. It analyzes the frequency of the single phase AC sine wave.
If the power company is putting out 59.5 cycles per second the
grid tie inverter will sync to this freqency and match the
positive and negaitve cycle of the sine wave.
3. It will put as much power back into the grid up to its
rating and up to the level of the power source (battery, solar
panel, wind turbine)
Your house will first use this power from the Grid Tie Inverter
(GTI). I have seen my meter come to a complete stop on a windy
sunny day. Most meters now will not turn backwards, but if they
do you are in effect selling power back to the utility. This
would be rare as most homes use far more power than they could
produce in a given month.
If you are planning on producing more than you use you will need
to contact your utility. If this is going to just supplement
your power needs, then you need to make sure the GTI has island
protection which it most likely does.
If you are off grid, you don't need a GTI. A standard inverter,
sized to fit your needs, is all you need.
#Post#: 9--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: Corwin Date: March 15, 2013, 8:27 am
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Thank you for the quick response. I have a couple more
questions. I don't necessarily plan to do this, but it will
help me understand the system.
If the meter doesn't go backward, does it block the power from
going back on the grid? Or does the power company get the
(small amount) of power for free? I hate to think of giving
away the power - but storing it can be expensive. I know that
larger systems (much larger price) can be set up to return power
to the grid. How this works varies by state (as in some you
never become a net energy producer, but you can get your usage
from the grid to approach zero). This allows you to use the
grid as a virtual storage system. In CA my sister has a solar
system. There the energy can go back on the grid, but over the
calendar year the best she can do is get to zero power from the
grid - some months positive some negative, but by the end of the
year the power company does not need to send a check. This is a
much larger system than what you provide here, so the yours can
be simpler.
If I were to use a wind generator, a few batteries and a GTI,
is the GTI capable of limiting the current so as not to overload
(I have to believe it would)? Again this gets back to if the
meter blocks power from going back on the grid. If the house
usage ever got below the output of the GTI, then you would be
giving away energy if the meter allows that.
I suspect that our house almost never goes that low on energy,
so some of this is academic. We have 3 out buildings (stable,
barn, and hay barn). I am thinking about installing a Gull160.
If that goes well I could add more over time.
#Post#: 12--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: Windcatcher Date: March 15, 2013, 9:46 am
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The power company gets the power. If you really think you will
make power, contact the power company and maybe they arrange to
buy.
A grid tie inverter on batteries has to have some limit or it
will pull the battery down to dead. Some GTI are setup so that
any excess charge goes to the grid without harming batteries,
but you need a strong source of power or it will just be a
surface charge.
#Post#: 13--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: windthot Date: March 17, 2013, 10:58 am
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When charging a battery bank, the power from the mill or solar
has to be higher than what it is going into ie. 12.x vdc going
into a 12 volt batt. My question if anyone knows is, for grid
tie,does the power only have to meet the utility voltage? ie. If
119vac and 59.5 hz (from utility). Does one have to be higher
in vac? Say 120vac? And also match the hz. Or can it be just
119vac (equal to utility)? To my mind it seems it should have to
be greater so as to over come the "push" of the utility
company... any thoughts?
Jim
#Post#: 14--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: Corwin Date: March 17, 2013, 1:07 pm
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Basic electrical theory says there has to be a voltage
difference for current to flow. In the case of moving power to
the grid, that difference would be very small, perhaps 0.1 volts
or less. It will depend on the resistance of the wires. (not
feeling energetic enough to look up wire resistance to get you
an example).
It is the GTI's job to make that voltage difference happen.
#Post#: 50--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: windthot Date: March 28, 2013, 9:01 pm
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Thanks Corwin. I suspected but didnt know for sure.
Jim
#Post#: 655--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: gadget Date: October 27, 2013, 5:26 am
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Hi. i wanted to give my input on several plug in grid ties and
a digital utility meter. i have been running a 300 watt and a
600 watt grid tie from my solar and wind. charging two large
airplane batteries. total system. can supply 20 amps charging in
a sunny day with wind at 15mph. i can tell ypu here in NC all
the meters are now digital. my system will stop the meter but
after several years i. came to the conclusion that the extra
power i put back in the grid would actually be counted as power
used. tthey were charging me more with my system. grid tied. i
contacted a friend of mine who works on these digital meters.
and he told me they are programmable to grid tying and unless. i
actually notified the electric company. and had my grid tied
system Ul inspected and pay a fee that any power used or added
will increment the kilowatt counter.But being he wasy friend he
came by one day and pullednthe meter and reprogrammed it in his
truck. now it actually shows any power comming from my grid
ties with a small lcd indicator saying sup for supplemental.
so unless you have an old wheel meter you might find that your
bill is cheaper without a grid tie connected like i did.
gadget
#Post#: 660--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: nessprojects Date: October 27, 2013, 12:23 pm
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@ Gadget
That is very interesting to know as we have a digital meter here
in the UK but I do only put about 80W max into the grid from my
solar panels. Most of it is getting used in the house though
before the electricity guys get it.
Very useful info Thanks !! NP.
#Post#: 1182--------------------------------------------------
Re: 300 watt Grid Tie Inverter
By: mindhormone Date: January 2, 2014, 5:30 pm
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Happy new year to all! :)
Marcus, this post of yours
http://www.lynxwind.com/1/post/2013/05/lynx-wind-grid-tie-inverter-limiter.html
1. I wanted to ask if for example a wind turbine has a steady
wind/rpm, would it be more suitable to directly connect to grid
tie inverter? and no frustrations at all?
2. Or even if (stable rpm), you still need battery bank in
between wind turbine and grid tie inverter?
3. Or in either case, you can choose both?
Yes i know it is impossible to have a wind turbine steady rpm,
but asking for educational purpose only :) and I was thinking
for a hydro turbine too.
Thank you
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