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External limiting an GTIL2 SUN-1000G2 with raspberry
#81
I have two GTILs that i want to monitor locally and control some things based on the power in and out.

I have wired an XBee S1 set to transparent mode directly to the pcb pins that are labelled ‘RS232’.

Conveniently, there is a 3.4V power supply on one of the pins and can power the XBee directly. It’s on the upper end of the XBee 3.4V max input power spec . I’ve had it running with no issues for the past two weeks. The rx/tx lines are 3.3V/3.4V so they can also connect to the tx/rx of the XBee directly.

The diagonal pads next to the rs232 text is a jumper to 12V presumably to power line drivers

If we call pin 1 the one closest to the corner ofnthe board next to the cable going to the lcd display
1= Gnd
2=3.4VDC
4=txen for rs485 line driver
5= tx output
6=rx input
7 = 12VDC when the diagonal pads are jumpered

I dont know what the other lines do but these suffice for serial data. They are set to 9600-8-N1 and running modbus protocol

From what i see, It seems what is sent out of the wifi module is Just a couple of the registers.

Watts out appears to be a running average, not what is displayed on the lcd

I’m trying to decipher the LCD cable frames next as that must have all of the data displayed on the lcd...which is what i need . Those also appear to be a modbus variation and 9600-8N1
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#82
Thanks for the info i will get an XBee S1 and start to play with that first.
I will look forward to see what you gleen from the display interface.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
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#83
Quick update...
I'm sniffing the LCD wires now with my XBee tied to the Tx going into the LCD. I mounted a standard 2dBi 2.4Ghz omni dipole antenna to the outside of the unit and drive it with the XBee--Wireless access is great. I can be anywhere in the house to access it now.

The LCD display looks to be receiving a block of 187 bytes sent once per second. It is not modbus, but rather just a huge frame of data in response to the LCD sending a small block of data to the main board.. The bulk of the block is what appears to be unscaled grid voltage waveform values that plot nicely in an excel sheet when I tried it.. I see the grid voltage and current clamp wattage. I should be able to see the rest once I hook up PV power later.

...Really cool stuff
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#84
(10-09-2018, 03:49 PM)Wolf Wrote: Yes I have one and have successfully installed it on my Split phase 220 system.
I found these upgraded cable coils on ebay so that it would monitor both legs of my grid power L1 and L2.  https://www.ebay.com/itm/Upgraded-cable-...2749.l2649

I also got the WiFi unit and after learning chinese (just kidding) I do have a computer background I got the unit to work and it transmits my plant info every 5 min to a data collection center which I can access at www.shinemonitor.com and can see what I am producing.
The neat thing about this unit is that lets say my house needs 1000 watts of power the Cable Coils will tell the GTIL what is coming from the grid and will produce up to the throttled amount 900 watts (I have mine throttled at 900 watts) and the grid is now only supplying me with 100 watts through the meter effectively cutting my electrical consumption. Also if my house only needs 500 watts than the GTIL will produce that and effectively stall the grid meter which is just drawing 5 to 7 watts just to let the grid company know i'm still here. It does not feed the grid hence those of us with "Smart Meters" don't  get penalized. It also automatically throttles down as the voltage of my now 6 month old newly antiquated flooded cell battery bank goes below a safe discharge voltage and wakes back up as soon as my panels start producing amperage. Once my flooded cell system is replaced by a Li system (after harvesting 2000 to 3000 cells that I will need) I can then dial it in to use more power from my panels and use the cell storage at night so I don't have to worry about killing my flooded pain in the rear picky lead acid batteries.

Pictures and wiring diagrams



attached. Let me know if you have any questions.
Picture of GTIL is before I tweaked the throttle. Notice it was producing 984.8w and grid supplemented with 116w.

Wolf

-------------------------------------------------------------------------------------------------------

I didnt think too deeply into this as I am not this far along in my planning yet but I have a question about your setup.  It may be a stupid question just because I haven't thought it through yet.   You have a 220v split phase supply coming into your house, half of your house is on one leg and the other half is on the other leg.  You purchased a 220V GTIL (as opposed to the 120V model) which you are using 2 current sensors in series(maybe this is where my assumption is wrong and the GTIL is sensing and feeding each leg independently) to monitor both legs of the 220V lines.  In this type of setup, isn't it possible that one leg (half your house) is using more current then the other leg but then since you are using current sensors in series the GTIL cant tell the difference between which leg is using more power so it simply sends out the total current sensed.  This means one leg could get more current then its using and the other leg less than its using, doesn't this cause back feeding to the meter on one leg(leg that is using less current) and underfeeding of the other leg(leg that is using more current)?

Best Regards,James
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#85
JM1,

I'm not sure exactly how it works but it does. I believe the GTIL injects the amperage at a slightly higher voltage and the "house" uses that first. If the sensors detect that there is a potential of current flowing back to the meter it throttles itself down. I just know according to my "Smart Meter" (which is not smart enough to determine inflow vs outflow) it would indicate a higher usage which it does not. Since you can see by the charts from my power company and the GTIL wireless link to shinemonitor.com that the 2 are correlated. GTIL output compared to grid usage. The spikes you see is the Fride coming on and as you can see the GTIL absorbs all of that and another spike around Noon. House mate coming home for lunch. I have many such correlations as the system has been up and running since late August. Almost all of my AC esp. when it is hot and sunny is absorbed by the GTIL. Matter of fact I am thinking of getting a 2000 Watt unit for next summer. I have 3000 Watts of Panels up and I want to use all I can  Big Grin .

Wolf

PS:
If there is anyone out there that understands how the GTIL scrutinizes and determines which leg to feed let us know.
Inquiring er puzzled minds want to know Huh .
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
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#86
The GTIL2 works onboth 120VAC and 240VAC interchangably. I run one in 120 and the other on 240V. No issues

How are those clamps wired? Series? Parallel?
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#87
(12-28-2018, 04:05 AM)aquaman Wrote: The GTIL2 works onboth 120VAC and 240VAC interchangably.  I run one in 120 and the other on 240V.  No issues

How are those clamps wired?  Series?  Parallel?

I do not know but I will take a resistance reading  as I have an original clamp and this modified 2 clamp version and get back to you.
I bought the modified one on ebay https://www.ebay.com/itm/Upgraded-cable-...:rk:1:pf:0
Right now my shed is stuffed with summer toys and it is difficult to get at things but I will try Big Grin .

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
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#88
FYI - Here is a recap of a setup with 4 units, two powering each 120 leg, and I guess each pair of inverters is working fine when hooked up to the same leg.

https://youtu.be/zVZPz9Kt8n8

Makes you question the value of the name brand units given the cost of these, $250-$280 a piece or $1k for 4 at 4kw vs an Outback 3648 at $1800 for 3.6k.
jm1 likes this post
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#89
Great stuff Solardad.
Nice video.

I did the voltage cutoff a little different and did not use relays.
In the programing function I set it for Bat or solar limited Power Mode where you can set your cutoff voltage.
I have tweaked it since then as I am still running Flooded batteries hopefully to change this coming year.

But as you can see by the display you can set your voltage to where the GTIL will go to sleep in this case it's 50.5V and the maximum output has been set to 900W. At 51.5V it wakes back up and starts to produce again. Of course the limit mode is set to on and as I am using modified L1 and L2 sensor clamps the internal limiter is checked on so I don't backfeed the grid.

What's nice about this system is that as it approaches the low voltage limit it gradually reduces its output and then when it hits it it just iddles along with minimal wattage usage. Then as it hits the reboot voltage it wakes up and starts to draw of of the extra that the batteries don't need and during full sun it will use as much as its limit of 900 Watts allows if the house needs it. I certainly do not use as much as you as my house idles at around 200 Watts. Lately though with all my Li charging I think it may have gone up a bit. Smile 

Sorry for the bad picture but thats all I had at the moment.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
Reply
#90
Wolf,

I like your setup and may copy it with a 2000w gtil2.  Have you experienced any power failures in your neighborhood since installing this?  My main concern would be if the power fails in my neighborhood and my house was using less than the 2000W at the time, then I would back feed into the grid (due to the pull from the neighbours houses) and potentially injure a line worker due to the back feeding.  I would like to design/add a sensor so if incoming power halts then the feed from the GTIL stops until I can flip a switch to isolate my house.
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