Thread Rating:
  • 1 Vote(s) - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5
External limiting an GTIL2 SUN-1000G2 with raspberry
Thank you very much. do you think you could think of amplifying the signal near the clamp and with a trimmer calibrate it to compensate for the longer cable length? but what board are you preparing that would work?
Reply
(02-26-2020, 04:50 PM)MDJGyurgeiz Wrote: Thank you very much. do you think you could think of amplifying the signal near the clamp and with a trimmer calibrate it to compensate for the longer cable length? but what board are you preparing that would work?

My board design doesn't have an input for an external CT clamp.  It has an on-board one, but you can't feed your whole house supply through it. It is only meant for measuring the current to/from one inverter. 

Basically it's the same as the official external limiter, but without the external CT clamp connection.  The reason I didn't include it is because I already have a whole house energy monitor, so can get my import/export readings from that. This then also allows me to place the board adjacent to the inverter, which is too far from my meter tails for an external CT to have worked.

You could use it like that, however, you said you're not allowed to feed into the grid, but how strictly is that monitored? There will always be some latency between sensing the export power and reacting to it, meaning small amounts of power will be exported. In my case that is allowed.
Reply
(08-02-2019, 02:15 AM)Doin it Wrote: Aminet why are u grounding your ct. also when using 2 cts one on each phase there is only 1 way to make the cable like I described above. Or am I wrong? When u get a second inverter u need to just parallel another 2 prong connector to second inverter. cable constructed like I said above. It’s odd how the inverters switch back and forth between master and slave. I’m trying to figure out how to dedicate one inverter as master all the time. Then install batteries on second inverter so that second inverter-batteries only get used when first inverter needs help with loads,Therefore prolonging batteries lifespan and keeping them charged more often.

I'm grounding the shielding around the CT..It's imperative to eliminate any chance of giving GTI a false reading of my power usage.

On another note. My single GTI with Limiter has been working well. I mentioned last year that I need to set up another GTI with another string of Solar Panels further away to capture afternoon sun. So I have done that. Problem with it is I can't use a limiter because distance is too great and limiter accuracy is compromised and very inaccurate at 100+ feet. 

So as a test, I have tried the following and I can not figure out why it isn't working.

I have the second GTI without limiter feeding into the same 240V lines as the GTI with limiter. The GTI with limiter with 2 CTs in series are connected to L1 and L2 from grid before the panel and the GTIs as it should be. Problem is that on days where I get enough sun hitting the 2 separate banks of Solar arrays for GTI1 and GT2, the GTI with limiter doesn't throttle down and I register a back feed into Grid of -600W, -400W whatever. Can not do a slave master set-up either. 

I have sat down drawn it out, thought about it, but can't understand why the GTI with limiter doesn't throttle back when it sees a feedback?
Reply
I am not grounding the CT or shielding at all and it always reads accurately...
also did u install the required resistor in your sensor cables wiring?
U are reading negative on both L1 and L2.. if u only read negative on one of the legs (once u correct the probelem) then this is normal.. the reason negative on one leg is normal (not backfeed) is due to the way your electric company meter reads your home usage..,, it reads both phases as a whole so negative on one leg gets subtracted from other leg to net zero..
Reply
hi,
I´m from portugal (european grid 230V, L1 and ground) I have two inverters GTIL 1000w with limiter, what i serching is the way to set this inverters, for one is the master until 900w and after that the second start too for give more power.
my setting is:
one is connect directly too the solar panels and the second too the batterys !!
and I need with the camp (or not) set the inverter is first ans the battery inverter the second, when the sun goes on, only the battery inverter working, until the sun comes again.

I think I can explain me !!?
Reply
You can have both inverters running off of the batteries and the inverters will use the available pv power before they use battery power.
If u insist on having one inverter powered by pv and other powered by battery, then you can try to put the limiting cables at different locations to try and get one inverter to be primary.
Are you using the newest version, the GTIL2?
Also you could go to the GTIL forum on Facebook to get more advice for these inverters
Reply
(10-13-2019, 10:55 PM)aquaman Wrote: I accessed the modbus a while back in this thread. Most of the registers seem to be nops.  The only interesting data that I could access was the wattage being output.

If anybody else has better luck, please share :-)

I have better luck sniffing the LCD display frames

(02-05-2020, 10:15 PM)aesanto Wrote: Hi to all

After reading carefully all posts, and with the knowledge adquired, i've managedto hack the LCD communication protocol and now I'm able to control the Inverter with an ESP8266 via WIFI.
But it not works perfectly. As at every power change it goes to zero before reach the target power.
I'm trying to understand why but so far no progress.

Also I need to decode the remaining protocol in order to get the values showed in LCD. For now i'm working without LCD.

As i understood, there is a frame of bits sent from LCD to the Inverter.
Over there there are some of them witch are the value of power limiting that we can set on LCD.
Changing this ones I can control the Inverter.

In the attached excel you can find the data and how i decoded the important bytes.

Lets see if can make this work smoothly.

Thanks

Hello,

just got two of these inverter's and very happy with them, i would be much happier if i could remotely monitor them. Do you mind sharing how you decoded the LCD display? I have tried the RS485 but the registers are limited to DC volts and AC Volts and I can only read up to 125 registers, as someone mentioned before, must be a firmware protection.

Attached are the boards, which seem to be newer version than whats been posted here.



thank you
Batrium WM5

Leaf Batteries Gen 2
Reply
(Yesterday, 01:54 AM)Doin it Wrote: You can have both inverters running off of the batteries and the inverters will use the available pv power before they use battery power.
If u insist on having one inverter powered by pv and other powered by battery, then you can try to put the limiting cables at different locations to try and get one inverter to be primary.  --- I have a external limiter with two outputs (from 2 inverters)
Are you using the newest version, the GTIL2?  --- yes
Also you could go to the GTIL forum on Facebook to get more advice for these inverters --- the facebook group use a mix language english and indian or something else Sad
Reply
Can u use the internal limiter of the GTIL2 instead of the external limiter? The group does have mixed language but also has a see translation.
The only way I know to designate a primary with these inverters is to place current sensors before or after the other depending on what they are connected to.. separating loads etc.
Patalhetas likes this post
Reply
(Yesterday, 07:40 PM)Doin it Wrote: Can u use the internal limiter of the GTIL2 instead of the external limiter? The group does have mixed language but also has a see translation.
The only way I know to designate a primary with these inverters is to place current sensors before or after the other depending on what they are connected to.. separating loads etc.
what facebook group you say ?

yes, I have a external limiter!!

the external limiter have two output for the inverters !!
Reply


Forum Jump:


Users browsing this thread: 3 Guest(s)