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External limiting an GTIL2 SUN-1000G2 with raspberry
(08-05-2019, 12:24 PM)watts-on Wrote:
(08-04-2019, 06:57 PM)ZARK Wrote: Hello all. Having read the entire tread I am still lost concerning remote monitoring of  this GTIL inverter. I have a GTIL2 1000 watt inverter ver 5.1 with the DB9 connector for remote monitoring.
however i do not have the wifi plug unit. I want to remote monitor my unit localy and not go to the chinese cloud. It seems some have done this here in the thread. I would like some help to do the seem please :-). First of, which standard/protocal does it use rs485 or rs232 with modbus. The manuel seems to imply 485. Or can it use both. The pin out for the DB9 connector on the unit would be helpful. I have a wifi RTU unit (model USR W630) that i want to use to connect it to my network and then monitor using openhab2 with the modbus binding. I cant get it work :-( any help Please. Thanks

It's a while since I dabbled with this, but here is some info and images I created at the time if it helps:

The interface is RS232:

The essential functions of the interface board:

The 8 pins on the left represent the ribbon cable from the main board.  The 9 pins on the right represent the RS232 D connector.  The centre pins are the connections to the RS232 level shifter IC (charge pump etc components not shown for clarity).
I'm not sure what the connection to pin 9 on the D connector is, but I suspect it is to provide power to a wifi type dongle, so watch out for that if what you connect to it is not expecting that as that is not standard on an RS232 connector.

Some screen shots of settings I used in a modbus application:

Thanks very much for your responce Smile . You have been very helpful. The pin out diagram was very useful. I have now manage to connect and communicate with the inverter Cool , although I cant make much sense of the data. I was successful with a modbus tcp client. I want to monitor the inverter using openhab2.  The modbus binding for openhab support tcp client anyone knows how to set this up. had no luck thus far Confused
I have 2 2000w gtil2s..they are both connected to one set of ct clamp sensors and one of them is great, no backfeed.
Do u guys think I can add a second set of clamps and have original set of clamps just go to one inverter then second set to the second inverter..
Reason I want to do this is so that I have permanent master and slave inverters. I’m thinking that I’ll put both sets of sensor clamps far apart from one another so that one set of clamps will see-send the signal first to the master inverter, then the second set of clamps will only send to the slave the signal for what the master can’t provide? Will this work...thoughts plz
Hi, guys-
Has anybody (like tocan or cherry67) found out in conversations with the factory people in China who actually makes the daughterboard (called the dc controller board) that has the connectors on it for external inputs to control the inverter output power? The inverter main board is made by Deye, but reading thru this thread makes me wonder about the dc controller board. Seems things would be a lot easier if we could order a bunch of these with hacked firmware to suit our purposes. Ideally, getting hold of the guy who actually wrote the code initially and paying him would be quicker that massaging the code with the inherent risks of overlooking a line of code here or there with possible disasterous consequences for the fets, igbts, and scrs in the power handling sections of the inverter.

The pic on the daughterboard is a Microchip dsPIC33F four channel controller which manages the inverter input boost smps (4 fets for a GTIL1 and 8 fets for a GTIL2). Seems the original developer could whip out some new code to do what we want if somebody could find the guy. A boo boo in the code could fry all of them.

Just wondering. Shout out to Wolf, we have met before
Wolf.....Seems like u are right,,,the 240v inverters do backfeed if loads are unbalanced. the leg that is using less power backfeeds and underfeeds the leg using more power...but they actually do not backfeed they just lower there output till there isn’t backfeed..READ BELOW in the bluetyping from messenger. Using 2 240v inverters and one set of cts in series then paralleled to each inverter let’s the grid supply more power at minimum than only having one 240v inverter. So this keeps the system from backfeeding as much but in turn doesn’t supply for all the loads it the defense of using the inverters at 240v, this allow both arrays of panels to supply for either leg..the 120v inverters connected pv can only supply loads on one leg.. so that’s a lot of wasted pv energy..
(08-18-2019, 03:35 AM)Doin it Wrote: Wolf.....Seems like u are right,,,the 240v inverters do backfeed if loads are unbalanced. .....................the 120v inverters connected pv can only supply loads on one leg.. so that’s a lot of wasted pv energy.......................
Ouch that's gotta hurt. Tongue

In my case the "wasted" PV energy charges the batteries so not much loss there as the batteries will supply both the 120v GTIL after the sun goes down till the voltage cutoff. Also in the AM the batteries get charged before the GTILs reboot voltage is reached.

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       
Wolf,,it does seem as if your panel is not as balanced as most houses, and u only backfed roughly 150w at the most, so with my panel and most ppls panels being more balanced they would see even less backfeed, little to none.. as long as panels legs loads are balanced within roughly 30% of each other.. ..Ofcourse as u know using batteries in the system has its own losses in efficiency. But your excess charges bats and keeps inverter going longer.
the text in blue above is what the 240v inverter actually does...was chatting with someone on messenger..just figured this out and didn’t feel like typing it again
sorry i an new here.

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