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External limiting an GTIL2 SUN-1000G2 with raspberry
#1
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
 
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#2
I have this unit (1000W). Buy new clamp sensor. It cant be expensive.
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#3
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 :-)

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#4
Hmmm, think you need a Daromer Big Grin
jamesk9 and Cherry67 like this post
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#5
I think Daniel is more the "MPP" Guy :-)
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#6
I have some info about those too Big Grin

The RS232 in current firmware cannot control the output im afraid. I have asked them to implement that Tongue 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.
completelycharged likes this post
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
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#7
I have some info about those too [Image: biggrin.png]


lol ... had no doubt Big Grin
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#8
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 Smile
dakoal likes this post
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#9
Yes, I am already member of the FB Group "GTIL Group", will try to get some Info.

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

tocan likes this post
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#10
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 ....

@wim , what information do you have?

Best way would be serial.
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