Smart Meter - > RS485 Modbus - > Growatt Inverter

[AnhDuc85]

Hi,

I'm using Tasmota since years to read my smart meter, it works perfect.
here's a snippet of my current script to read the meteer data:

D
B
=>sensor53 r
M 1
+1,3,s,16,9600,GS303
1,77070100010800ff@1000,Total Consumed,kWh,Total_in,3
1,77070100100700ff@1,Current Consumption,W,Power_curr,0

I've got an cheap growatt sph inverter, with RS485 port.
There are already some projects to fake an SDM630 energy meter but mostly with an seperate ESP.
Since my inverter is close to my smart meter, I would like to provide the data from my current device.
So SML->Tasmota(ESP)->ModBus RS485

I guess I need some kind of rule to forward the meter data ?

[nelzon101]

I search the same.
I would like read from the SDM630 to integrate the data in iobroker and bypass the SDM630 to my Growatt SPH.

[HofeBY2]

Which 3,3V TTL to 2wire RS485 are you using ?
GPIO configuration ?
Wirering ?

[nelzon101]

Currently the SDM is connected directly to the Growatt, but in the past, before I had the inverter, I had the SDM with a WemosD1mini and the cheap blue RS485 TTL UART adapter (1.19€ from eBay) and sent the data to iobroker via MQTT. How could I send data to the Growatt via RS485? I know very little about Modbus.

[HofeBY2]

This is why I alsked about your RS485 Adapter.
Add a picture or a Link of this device.
Add a picture of your GPIO configuration.
Add a scematic / picture of your wirering.

https://tasmota.github.io/docs/Smart-Meter-Interface/#meter-definition

[nelzon101]

https://www.amazon.de/dp/B083943T9J/ref=pe_27091401_487024491_TE_item

i have no wirering or configuration, because the project is 2 years ago. sorry

[HofeBY2]

OK, no wirering and a me unknown Board.
Good luck.

https://michael-heck.net/2019/08/sdm-630-mit-tasmota-auslesen/

[nelzon101]

Die Version von Michael Heck hatte ich damals genutzt. Ich erkenne es wieder. Hat auch super funktioniert, aber dann brauchte ich die RS485 zur direkten Kommunikation zum Growatt. Und somit kann ich den SDM nicht mehr auslesen, weil der Growatt der master geworden ist.

[gemu2015]

am not sure what you guys want to achieve exactly, but i once used this script for zero injection of photovoltaic power with a Growatt inverter. here is the principal script to emulate a few registers of an SDM630.
it can be used as a starting point.

>D
; simulate eastron sdm modbus meter
res=0
m:req=0 8
m:resp=0 128

addr=1
regs=0
; out
zwzo=0
; in
zwzi=0
; current
zwzc=0

>B
=>sensor53 r

>BS
res=0
; must be hardware serial pins
res=so(3 1 9600 8N1 1024)
print open %res%


>M 1
+1,4,s,0,9600,SML
1,77070100010800ff@1000,Verbrauch,KWh,Total_in,4
1,77070100020800ff@1000,Einspeisung,KWh,Total_out,4
1,77070100100700ff@1,Aktueller Verbrauch,W,Power_curr,0
1,77070100000009ff@#,Zähler Nr,,Meter_number,0
#


// sdm630 main regs
;+1,3,m,0,502,SDM630,0,10,01040000,01040002,01040004,01040006,01040008,0104000a,0104000c,0104000e,01040010

;1,010404ffffffff@i0:1,Voltage P1,V,Voltage_P1,2  
;1,010404ffffffff@i1:1,Voltage P2,V,Voltage_P2,2  
;1,010404ffffffff@i2:1,Voltage P3,V,Voltage_P3,2  
;1,010404ffffffff@i3:1,Current P1,A,Current_P1,2  
;1,010404ffffffff@i4:1,Current P2,A,Current_P2,2  
;1,010404ffffffff@i5:1,Current P3,A,Current_P3,2  
;1,010404ffffffff@i6:1,Active Power P1,W,Power_P1,2  
;1,010404ffffffff@i7:1,Active Power P2,W,Power_P2,2  
;1,010404ffffffff@i8:1,Active Power P3,W,Power_P3,2

>F
; get values from sml meter
zwzi=sml[1]
zwzo=sml[2]
zwzc=sml[3]

; check for incomming request
res=sa()
if res>0 {
	;print res=%res%
	
	res=sra(req)
	print request = %req[1]% - %req[2]% - %req[3]% - %req[4]% - %req[5]% - %req[6]%
	
	delay(10)
	; slave adress
	; function code
	; start adress Hi
	; start adress Lo
	; np Hi
	; np Lo
	; crc Lo
	; crc Hi
	
	regs=req[6]/2
	resp= {0 0 0 0 0 0 0 0 0 0}
	
	if res==8
	and req[1]==addr
	and req[2]==4 {
	
		if req[3]==0
		and req[4]==0 {
			print Reg 0 7
			; report 230 Volts, current, watts, va
			resp[1]=230
			resp[4]=2
			resp[7]=abs(zwzc)
			smw(addr 3 resp regs)
		}
	
		if req[3]==0
		and req[4]==70 {
			print Reg 0x46 5
			;frequency 0x46, total import, total export, total imp kva, total export kva
			resp[1]=50
			resp[2]=zwzo
			resp[3]=zwzi
			resp[4]=zwzo
			resp[5]=zwzi
			smw(addr 3 resp regs)
		}
	
		if req[3]==1
		and req[4]==86 {
			print Reg 0x156 2
			; report total kwh, kvarh
			resp[1]=zwzo
			resp[2]=zwzo
			smw(addr 3 resp regs)
		}
	
		if req[3]==0
		and req[4]==18 {
			print Reg 0x12 7
			; p1 voltamps  0x12, voltamps reactive
			resp[1]=abs(zwzc)
			resp[4]=abs(zwzc)
			resp[7]=1
			smw(addr 3 resp regs)
		}
	}
}

>R
; close serial port
sc()

if you want to decode an SDM630 by SML you may use this:

>D

>B  
->sensor53 r

; multiple float register request, 9 at once
>M 1  
+1,[192.168.188.106],m,0,502,SDM630,0,20,r010400000012
1,010424ffffffff@i0:1,Voltage P1,V,Voltage_P1,2  
1,010424x4ffffffff@i0:1,Voltage P2,V,Voltage_P2,2  
1,010424x8ffffffff@i0:1,Voltage P3,V,Voltage_P3,2  
1,010424x12ffffffff@i0:1,Current P1,A,Current_P1,2  
1,010424x16ffffffff@i0:1,Current P2,A,Current_P2,2  
1,010424x20ffffffff@i0:1,Current P3,A,Current_P3,2  
1,010424x24ffffffff@i0:1,Active Power P1,W,Power_P1,2  
1,010424x28ffffffff@i0:1,Active Power P2,W,Power_P2,2  
1,010424x32ffffffff@i0:1,Active Power P3,W,Power_P3,2  
#  

; multiple float register request, 3 at once
>xM 1  
+1,[192.168.188.106],m,0,502,SDM630,0,10,r010400000006,r010400060006,r0104000c0006
1,01040cffffffff@i0:1,Voltage P1,V,Voltage_P1,2  
1,01040cx4ffffffff@i0:1,Voltage P2,V,Voltage_P2,2  
1,01040cx8ffffffff@i0:1,Voltage P3,V,Voltage_P3,2  
1,01040cffffffff@i1:1,Current P1,A,Current_P1,2  
1,01040cx4ffffffff@i1:1,Current P2,A,Current_P2,2  
1,01040cx8ffffffff@i1:1,Current P3,A,Current_P3,2  
1,01040cffffffff@i2:1,Active Power P1,W,Power_P1,2  
1,01040cx4ffffffff@i2:1,Active Power P2,W,Power_P2,2  
1,01040cx8ffffffff@i2:1,Active Power P3,W,Power_P3,2  
#  

; single float register request
>xM 1  
+1,[192.168.188.106],m,0,502,SDM630,0,10,01040000,01040002,01040004,01040006,01040008,0104000a,0104000c,0104000e,01040010  
1,010404ffffffff@i0:1,Voltage P1,V,Voltage_P1,2  
1,010404ffffffff@i1:1,Voltage P2,V,Voltage_P2,2  
1,010404ffffffff@i2:1,Voltage P3,V,Voltage_P3,2  
1,010404ffffffff@i3:1,Current P1,A,Current_P1,2  
1,010404ffffffff@i4:1,Current P2,A,Current_P2,2  
1,010404ffffffff@i5:1,Current P3,A,Current_P3,2  
1,010404ffffffff@i6:1,Active Power P1,W,Power_P1,2  
1,010404ffffffff@i7:1,Active Power P2,W,Power_P2,2  
1,010404ffffffff@i8:1,Active Power P3,W,Power_P3,2  
#  

[AnhDuc85]

sorry, wasn't clear enough, I mean, where exactly should I see the "1 in req[1]"?

[gemu2015]

print request = %req[1]% - %req[2]% - %req[3]% - %req[4]% - %req[5]% - %req[6]%
so the first parameter must be 1 printed in console

[AnhDuc85]

switched A/B and looks like this, seems good?

20:41:18.853 request = 4.00 - 3.00 - 32.00 - 20.00 - 0.00 - 6.00
20:41:18.877 startaddr=8212.00 - numregs=3.00
20:41:18.898 request = 2.00 - 4.00 - 0.00 - 0.00 - 0.00 - 18.00
20:41:18.924 startaddr=0.00 - numregs=9.00
20:41:18.997 request = 4.00 - 3.00 - 32.00 - 20.00 - 0.00 - 6.00
20:41:19.020 startaddr=8212.00 - numregs=3.00
20:41:19.097 request = 1.00 - 4.00 - 0.00 - 0.00 - 0.00 - 20.00
20:41:19.121 startaddr=0.00 - numregs=10.00
20:41:19.198 request = 3.00 - 3.00 - 32.00 - 0.00 - 0.00 - 10.00
20:41:19.220 startaddr=8192.00 - numregs=5.00
20:41:19.298 request = 1.00 - 4.00 - 0.00 - 0.00 - 0.00 - 20.00
20:41:19.320 startaddr=0.00 - numregs=10.00
20:41:19.398 request = 3.00 - 3.00 - 32.00 - 0.00 - 0.00 - 10.00
20:41:19.421 startaddr=8192.00 - numregs=5.00
20:41:19.498 request = 1.00 - 4.00 - 0.00 - 0.00 - 0.00 - 20.00
20:41:19.520 startaddr=0.00 - numregs=10.00
20:41:19.599 request = 3.00 - 3.00 - 32.00 - 0.00 - 0.00 - 10.00
20:41:19.622 startaddr=8192.00 - numregs=5.00
20:41:19.699 request = 2.00 - 4.00 - 0.00 - 0.00 - 0.00 - 18.00
20:41:19.721 startaddr=0.00 - numregs=9.00

[gemu2015]

This looks much better,
At least a few lines look ok
May be the inverter checks several addresses for a meter
I will wire my own growat to compare with yours tomorrow

[AnhDuc85]

great, thank you.
I could also change the inverter ID from 1 to something else if it might help..