External limiting an GTIL2 SUN-1000G2 with raspberry


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dakoal

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Nov 8, 2016
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Found that the free white 2-pin conector is a poti connect.

0-1,6V = 0-100% Load.
 

Korishan

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Interesting. Are you changing the output wattage, or what?
 

daromer

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Yes they even sell units with that pot enabled or included.
 

tocan

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Sep 20, 2017
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i saw both videos but its not clear to me for what is it for.

Anyways i saw you Daniel did post in the GTIL Group at facebook. I have to tell you Daniel that its a mostly philipinnes guidet group and it seems that the supplier is not happy about this group runs because they just try to break down the prices. So in my conversation with management was one of their first statements and most important questions if i am a supporter of this group or not and communication was calm more that i negotiate this. Also after this i got the Serial protocol. Its the reason i do not answer you in this group. This group seems not get much support from management.
 

dakoal

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Thats great news. Then I will leave the philipinian FB group of GTIL and we can communicate here.

With the 0-1,6V Signal (coming from a Raspberry maybe), I can regulate the watts pushed into the grid, with my logic, not the logic used from the gtil inverter. This is necesserry because in Austria (for example), we have a three phase power net. ANd the gtil is only a one phase product.

So if you now know where to solder the rs232/485/... pins and have the protocol we can drive this further with not using the poti, but with commands sent from the raspberry.

I apreciate your answer.
 

tocan

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I did open it and identified it all. But did not make photos now. The reason is i like to make a video but like to make it a bit better. What we can do is something like this... Are you able to identify the electronic parts inside. and we make the video somehow together.

See here like this...

Adams Videos i like and the chinese understand slowly that even if he say this is not good and so on that its marketing for theem and helps to sell but also for this he get the most new products for testing also if they are noton the market now. I can send you when i prepare and make photos and a litle video you in advance...

Maybee my stupid i dea is this to use the 1000 24-90 during winter time, because i saw a video that is not recomenting the big one for the winter...
in my epever i saw that the small unit will produce in winter more energy and the big one will be not enough to convert. Two panels in winter serial will be enough to convert all the day. But with the 45-90 volts i will reach the minimum level only for maximum 1 hour.

Iwill send you a private message...

my video not good because i am not an expert but reasonable somehow...

 

tocan

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daromer

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Tocan: Ah ok. No idea which one of the groups are the genuine. I have talked to some one there that said was the management before and they told that they would think about adding the controll point of the feed back to the rs232 as well and not just the pot or the display settings
 

tocan

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daromer said:
Tocan: Ah ok. No idea which one of the groups are the genuine. I have talked to some one there that said was the management before and they told that they would think about adding the controll point of the feed back to the rs232 as well and not just the pot or the display settings

i did have in the morning in whats app a contact with the manager....

he is in vacation but we have some good talk...

He write the following: You can't control the current from RS232. You can control it by LCD

The Philipines group did request to make the internal limiter for them because they think that for this is there a big market. Ok so their technichian did realize it.
The prize calculation i beleave is so that at philipines the RPI have to be after 1-2 years in this area because than there is a motivation to buy and install.

I can open the chinese protocol for our discussion here but its not set under CC-BY-SA license.

And he told me that they did not make the Firmware and that it was done by another company! But in general he find the idea to work together for a monitor plattform sexy...

And if true than its a good idea and better place the sourceforge plattform than the git only... GPL code and if you think to make it comercial than MIT licence.
Ahh manager needs VPN to break the big firewall and allways his vpn connections are blocked. He use now my private VPNgate in canada and this can not be blocked by the big firewall. Chinese did try it but they let us in peace....

If interest why nd how its a half hour video in english:

Attachment official RSS protocol in chinese language (needs to be translate with google to english)
 

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  • Modbus RTU Protocol ????V100.pdf
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daromer

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Im personally only interested in the feedback parameter. Thats what held me back getting a unit :)
 

dakoal

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Maybe the LCD is serial driven an I can decode the messageS, then we are in :)

Modbus/rtu pdf is great.

now i would need a picture of the connector
 

tocan

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dakoal said:
Maybe the LCD is serial driven an I can decode the messageS, then we are in :)

Modbus/rtu pdf is great.

now i would need a picture of the connector

See i guess this is the company and their engeneers did make the modbus and serial. the manager does not understand what is serial. And my first thinking was the same like yours when i saw their definitions. I think we should start a bit with translations and make with grafana a first view... the definitions are there and why should they make so much definitions and start a iot platform if they do not plan to use the definitions...

you can follow in the philipines group documentation where they have grabed a lot of papers also the changelog of the different firmware.

Why an engeneer should make the display more difficult and not use the modbus for this? I do not have a reason.

For the management is important just the sales. And as they understand that we help their sales i hope for more support.

Maybee you understand now my strategy... a good video will help them and additional it brings a lot of attention for the diy forum....

Electronicly i am more a very early starter... i understand only what is important for you to go on.... I did not understand yours 2 videos without more info, but i thing the others here understand them well...
 

dakoal

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Nov 8, 2016
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I have a Battery
The GTIL2 is connected to this battery, and to the grid.

His "normal" function is to measure the powerflow from the grid to the house with the help of the blue clamp sensor and try to zero it with power from the battery.

If you have to phases in your house, you need 2 GTIL, if you have 3 phase (Austria, Germany ...) , you need 3 Inverters to zero out every phase.

With the modification I did, I can tell the GTIL how much power to feed into the grid on his one phase.
So I can feed the power consumption of all three phases to te grid and the meter stops.
Up to 950 Watts this works with a SUN1000 Gen2 without any problem.

First Video was showing "Pot" Mode, where you can mount a knob on the housing of the inverter and can set 0 to 100% power.
Second video shows the possibility to feed an external voltage (0-1,6V), for example produced with PWM from an Arduino or Raspberry to this pot port and also controll 0-100% power.

Is it now better understanding?

Have a great day
 

tocan

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Sep 20, 2017
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I did open my GTIL for a first view and did make a first video to cut it later together. Maybee the experts can help me to identify the processors or parts and special if the chinese take good quality... You can give me some comments in youtube, with this i plan than to make and cut a good video together with description in my blog. Thanks for comments in you tube and yours findings... Chinese will see it and as more we find out as more Infos i hope they give us.:

 

dakoal

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I will reply here, as soon I got my UART-USB Converter to test the Serial connection.
 

tocan

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dakoal said:
I will reply here, as soon I got my UART-USB Converter to test the Serial connection.

If you set in youtube your video under creative commons license as i did for mine than we can mix and remix our findings to a video... also it can be translat because of audio mixing easy to other languages... my problem was i could not identify the used parts and can not say its a good design or not... i saw only that the work is not so good as in my former epsolar units...
 

tocan

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Sep 20, 2017
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Good news for Modbus RS485

Today i did phone with the developer in China and he will help us...

After Phone he did write me this:

"OK, I known. The protocol is written by me.
Because my poor english, I will ask someone to translate the protocol."

For culture understanding: Its very unusual that in china say something like this. He did excuse indirect not to make a translation. So guys let be fair... i gues the make us a cheap price for ther Wifi products and as far i see we should work hand in hand... Their main business are not this kind of dongles but to make a dongle yourself with esp8266 is not much more cheaper if you set the cost of a case in comparison so i think to honor a bit their work we can go there at a later point and buy directely there. And i guess as long we are here in developement the price as far i did understand is 25 $ more cheap than the official prices i saw in facebook... so it can be a win win situation for both sides...
 
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