Limiter inverter with RS485 load setting


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I just got my Soyo. Implemented the RS485 commands via ESP8266/nodemcu. Settings inverter:

  • Battery CP Grid N
  • Bat CP Mode 800W
  • Bat AutoLimit Grid Y
Sending 2456002101E58022. On the display I briefly see the Rs485 word appering, power goes up to the requested value but decreases back within 2-3 seconds to zero.

Inverter is working just fine (800W) in constant CP mode. Firmware: STC8-22-1025.

What is wrong?
 
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I just got my Soyo. Implemented the RS485 commands via ESP8266/nodemcu. Settings inverter:

  • Battery CP Grid N
  • Bat CP Mode 800W
  • Bat AutoLimit Grid Y
Sending 2456002101E58022. On the display I briefly see the Rs485 word appering, power goes up to the requested value but decreases back within 2-3 seconds to zero.

Inverter is working just fine (800W) in constant CP mode. Firmware: STC8-22-1025.

What is wrong?
Seems I found the answer in one of the German language messages of this forum:


"Grundlegend ist FAKT: wann der SOYO Wechselrichter keine Signale gesendet bekommt hört er auf einzuspeisen(Safety)!"

So it seems it is a safety feature. So I would have to resend the telegram periodically. Let me test that...
 
Hi all. I have read this thread so many times and it has bee a great help. I have a wifi Soyo(no display), its a couple of months old, connected as PV Limited (no battery yet) and working fine. I have managed to connect through RS485 to be able to read values from power sensor CT and to set the power lever of the inverter but cannot get any reply back from the inverter reguardless of what I send to it. On a previous post it was suggested the changing byte[6] to 40 instead of 128 should get a response, I am not getting any reply, I have tried all different values. Does anyone know if the wifi inverters send out information over 485.
Any suggestions would be great
johnneySul
 
I think there are different firmwares in these boxes / CPU's - I have 3 different CPU's - what command are you sending? I could try with each of the CPU's that I have... I think a better way would be to sniff the serial commands between the main board and the screen / USB stick...
 
I have tried sending the codes that come from the CT and just changed each byte in turn, I have never received anything from the box. I would think it odd if it was not able to send out information on the 485 but who knows. My python programming is limited so maybe I'm doing something wrong but I am communicating with the CT and my Epever charge controller. I will have a look at the comms in the WIFI stick when I have time. I think there is some information back in this thread about the connection of the screen.

Thanks for the reply
JohnneySul
 
Hi,

I know you all have been playing around with these inverters so I thought I would ask if you have come across this..

I have the 1000w version, 24v, connected to two tesla battery packs in parallel. These batteries charge up overnight on economy 7 and then I want them to discharge into the house during the day. I have a clamp and meter supplied. I have noticed at night when the battery starts to get wound down to 22v that the house is wanting 430w, the inverter says it's supplying 430w yet the onzo power meter I have shows there is 280w being imported from the grid. In the morning under similar conditions with 24v charge there's 30w being imported.

I have fitted an inline power meter to the inverter to see the power pull this morning. I put the house under a 700w load, the inverter said it was pushing 670w out, the inline meter showed 488w being pulled and the house meter showed 230w being imported.

Am I correct that the efficiency of the unit drops as the power demand increases? Also as the power supply drops does the same happen?

I intend to wire some solar panels into the mix with a mppt solar charger when it arrives, to help keep the batteries topped up. But would a buck boost converter, pushing the volts from 24 to 28, help? What about changing any capacitors inside to improve efficiency?

Any wise words greatly listened to in regard to this inverter..

Regards

Shaggy
 

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@shaggy
I'm not quite sure how you have all this hooked up but........
If you are charging the batteries from the mains and have a CT on the mains that controls the GTI it would kind of couse a loop.
As you are charging the batteries the inverter is trying to supply the AC to charge the batteries. If you are charging the batteries the inverter needs to be off or the CT needs to be on a load other than the mains. i.e. just a load center after the charger for the batteries.
Also if you are charging the batteries at night with low cost power then the rest of the house can also use that. If you charge the batteries at night and still use the GTI to assist in house use. you are loosing at least 20% efficiency.

Wolf
 
@shaggy
I'm not quite sure how you have all this hooked up but........
If you are charging the batteries from the mains and have a CT on the mains that controls the GTI it would kind of couse a loop.
As you are charging the batteries the inverter is trying to supply the AC to charge the batteries. If you are charging the batteries the inverter needs to be off or the CT needs to be on a load other than the mains. i.e. just a load center after the charger for the batteries.
Also if you are charging the batteries at night with low cost power then the rest of the house can also use that. If you charge the batteries at night and still use the GTI to assist in house use. you are loosing at least 20% efficiency.

Wolf
Hi, yes it is set up with WiFi controlled plugs that switch the inverter off at 11.27pm, when the cheap rate begins, and switches on the charger so as not to cause a loop. Then at 06.27am the charger switches off and the inverter switches back on.

Cheers

Shaggy
 
Just a little update: I bought another Soyo without the display, then just to check, I took the CPU and the display from my old 'broken' Soyo. I wanted to find out if it was broken because of a bad CPU. Turns out that the CPU and display is working fine. Then I changed the CPU with a new one that I also bought. I found out that the display still shows the 630.3 Total kwh (the amount my old inverter did) - this means that the settings / data is stored in the display CPU, not the CPU directly connected to the main board.

I still can't figure out why my old Soyo continue to reboot, must be something with the mainboard...
hi happenned to to me on november 2022. voltage issues on my wifi unit. then hi temp messages althoug unit was cold
i opened it up capacitors were damaged. try to measure them and replace them. it solved my problem
 
I found an alternative for connecting with soyo by using RS-485 (for power limit). Instead of wemos I am using Protoss gateways (like PW11). They can handle for example Mqtt or HTTP/GET, so with an additional script it is possible to get (limit)data from any mqtt broker an forward it to soyo. Also a direct connection (over HTTP/GET) to a smart power sensor like shelly 3em pro is possible.
 

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hi happenned to to me on november 2022. voltage issues on my wifi unit. then hi temp messages althoug unit was cold
i opened it up capacitors were damaged. try to measure them and replace them. it solved my problem
Thank you! All 4 caps. look fine, didn't pop or anything - I just removed all 4 and measured them - 2 working and 2 broken - I ordered 4 new.
 
A little update - I have changed the caps. now - unfortunately it still show the fixed value 239VAC and after about 30 secs it continues to reboot - I have connected the display / CPU to another unit and here the VAC changes / show the correct value - so it must be someting on the main board... :confused: When I had the unit open I checked the mosfet's and they are MUR1660CTR and IXT74N20P - just in case anyone want to know...
 
hi, one of my soyo gti 1200w burned out 2 fha90n25, as it had just been purchased the company sent replacement parts, but when exchanging it, doing another check, I found a small diode that is in each of them open, the diode is very small and does not I know how to find out the model to change, I tried to see something written on them but without success. Can someone help me?
 
Which one of the diodes? I just checked my Soyo 1200w - Z201, Z202, Z203, Z204 is marked WH - Z211, Z215 is marked M7 - D208,209,210 - D212,213,214 - D3, D4 is marked T4
 
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Has anyone had success connecting the WiFi dongle to the internet?
YES
 
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