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cgecastro
Newbie

Joined: 24/12/2011
Location: Portugal
Posts: 2

Posted: 10:32pm 25 Dec 2011

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Hello,
I recently purchased a Power Jack PSWGT-600 grid tie inverter.
The reason I am writing this is to confirm, with the electronics gurus that it (im)possible to throttle the inverter output.
Let me clarify:
My meter does not count backwards so sometimes I am producing more energy than the house is consuming and giving it for free to the power company.
My idea was to (in the times of extra production) dial down the grid inverter to match the input power and use the extra juice to charge a battery bank for energy that I can use later.
Anyboby knows if this is possible?
Thanks

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 01:48am 26 Dec 2011

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Hi there

It isn't possible to reduce the power output of the inverter itself, the only way is to make a current limiter in the input side to reduce the power input, but this will not produce a reserve of power, unless you use a battery bank to store the excess energy.

All the best

Bob

Foolin Around

cgecastro
Newbie

Joined: 24/12/2011
Location: Portugal
Posts: 2

Posted: 08:57am 26 Dec 2011

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Thanks @ VK4AYQ,
I already have a battery bank, I use it to keep a better load on the wind turbine because the inverter is very slow to respond and the turbine would speed up very quickly, maybe a big capacitor would do the same job?
Right now I have a diode so that the battery bank only charges and when It is charged I manualy set it to discharge.
I would like to automate this setup and throttle the output of the GTI (it get's very hot and shuts down if outputting more than 400W), so when I connect the batteries to it, the GTI goes to max power, and I want to avoid this.

Can anyone provide me with a simple (if possible)circuit to limit the current by comparing values of the currrent on the house input and the grid tie output?

Thanks

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 11:58am 26 Dec 2011

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Hi there

I have one and had the same heating problem, so I cut a 3 inch hole in the bottom plate and fitted a computer case cooling fan, run it of power in via a 12 volt 5 amp regulator run it all the time, discard the small original fan and open up the cooling holes in the end caps, mine runs 1t around 18 amps input at 28 volts. A large cap direct on the power input will help also. for current limiting I would suggest a limiter for a HHO generator as there are are a few circuits on the market but are set to a fixed ampere draw.

All the best

Bob

Foolin Around

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