External limiting an GTIL2 SUN-1000G2 with raspberry

[dakoal]

Hi,

I have a question to the ones here using the chinese blue Battery Grid Tie Inverter with limiter.

In my usecase I Need to Limit the Output with my raspberry.

The clamp sensor will not work.
The "internal" limiter port is listenig to an AC Signal from an clamp sensor (I think 0-5V AC)

The external limiter becomes it's Signal from the external limiter box, I didn't have one to check what Comes out of it.
If I do 0 to 2,49V DC on the external limiter, the Inverter stays off.
After increasing the voltage above 2,5V it starts and goes up to the "Battery Amp" Limit from the menu.
But I can't do a "smooth" limiting.

Attached find some pics.

Thanks in advance

Bernhard
 

[Ragulin83]

I have this unit (1000W). Buy new clamp sensor. It cant be expensive.

[dakoal]

You don't understand.

I can't use a clamp sensor, and the sensor works fine.
We have a three phase system, and a complete power metering system.
How much power the GTIL has to produce I already know, but I can't tell him.

But I found a cool connector inside.

RS232 and WIFI, does anyone know the pinout :-)

[wim]

Hmmm, think you need a Daromer

[dakoal]

I think Daniel is more the "MPP" Guy :-)

[daromer]

I have some info about those too

The RS232 in current firmware cannot control the output im afraid. I have asked them to implement that T

You can use the device that you set with external pot though or as you was looking at with emulating the clamp-sensor. I dont own a unit myself since im waiting for the RS232 function to be implemented. So cant say for sure what the clamp gives out to the box or what is needed.

[wim]

I have some info about those too


lol ... had no doubt 

[daromer]

Feel free to chase them. They have a group on Facebook. I have asked several times already about a function to control them so they are most likely getting bored of me

[dakoal]

Yes, I am already member of the FB Group "GTIL Group", will try to get some Info.

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Ok, found something. Now I need some help with generating a +/- 0-2,5V Sinus (or rectangle) with an raspberry or Arduino.

Stolen from here:
http://www.homautomation.org/wp-content/.../step3.jpg

[dakoal]

I think that wouldn't work.

Because the GTIL always wants to have the clamp signal zero. So if I increase the value of the sinewave it will try to zero it .... hmmmm more complex than thought.

A better way will be to find a "pot" port or something on the controller board of the GTIL ....

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@wim , what information do you have?

Best way would be serial.