Solar Charger RS485

[grundholm]

Recently I bought this solar charger on Aliexpress, it has RS485 - I have been playing around with the RS485 port and with som help from the nice people in China i'm now able to get some data

Anyone here have experience with this charger?

 

[Korishan]

Please do share details. What inverter is this? Link to aliexpress page?

 

[floydR]

charge controller https://www.aliexpress.us/item/3256804964260914.html
later floyd

 

[grundholm]

I got it from here:
https://de.aliexpress.com/item/1005004417934706.html

I bought this charger because it is very universal and easy to setup. The max. solar voltage is 230VDC and battery between 12V and 96V. In the menu it's possible to choose the battery type, Lead Acid, GEL, LiFePo4, Li-Ion and User - and how many batteries in series.

It has a RS485 port - On the pictures it looks like a normal RJ45 network port but I was surprised to find out that it's a RJ12 6P6C (not included)
The settings for the port is: 2400 baud, check bit NONE, data bit 8, stop bit 1
If I send 0x01 0x03 0x00 0x00 0x00 0x14 0x45 0xc5 then I get 45 bits back, the string contains all registers

 

[Korishan]

I got it from here: https://de.aliexpress.com/item/1005004417934706.htm

for some reason this list isn't working for me. Tried different browsers and even disabled my dns blocker just in case. I get blank page

 

[grundholm]

I have updated the link... missing the l in html

Some pictures of the menu:

And modbus:

Modbus Response (COM4)
Address: 1
Function: 3 (0x03) - Read Holding Registers
Byte Count: 40
Values: 00 01 00 01 00 00 02 00 00 4c 00 00 00 03 02 c1 02 c1 01 dc 00 c9 02 dd 02 9a 00 6f 02 8b 00 00 00 2b 00 00 00 00 12 65
Register0: 1
Register1: 1
Register2: 0
Register3: 512
Register4: 76
Register5: 0
Register6: 3
Register7: 705
Register8: 705
Register9: 476
Register10: 201
Register11: 733
Register12: 666
Register13: 111
Register14: 651
Register15: 0
Register16: 43
Register17: 0
Register18: 0
Register19: 4709
Checksum: 0xbc0d - OK

 

[Korishan]

I have updated the link... missing the l in html

Doh!! I didn't even think of checking that lol

 

[grundholm]

Finally we got some sun here and i'm testing the charger. It works very well and I did a little programming in ESPHome / Home Assistent.

 

[radoslavv]

I got it from here:
https://de.aliexpress.com/item/1005004417934706.html

I bought this charger because it is very universal and easy to setup. The max. solar voltage is 230VDC and battery between 12V and 96V. In the menu it's possible to choose the battery type, Lead Acid, GEL, LiFePo4, Li-Ion and User - and how many batteries in series.

It has a RS485 port - On the pictures it looks like a normal RJ45 network port but I was surprised to find out that it's a RJ12 6P6C (not included)
The settings for the port is: 2400 baud, check bit NONE, data bit 8, stop bit 1
If I send 0x01 0x03 0x00 0x00 0x00 0x14 0x45 0xc5 then I get 45 bits back, the string contains all registers

Hello,
How did you connect device, please?
According to picture on the device pins are 1. RS485-A, 2. 0 V, 3. RS485-B, 4. 0V, 5&6 5V.
However no any response from device using CP2102 device in RS485 mode.
I can see TX LED shows activity, but RX LED no any activity.

As no success with stty & echo I tried also mbpoll:
mbpoll /dev/ttyUSB0 -m rtu -b 2400 -P none -d 8 -s 1 -v -a 1 -r 1 -t4:hex -c20
but also no any response.

 

[grundholm]

A -> B and B -> A no ground

I tried with different RS485 devices but the one on the picture works very well with an ESP32 (because of the 3.3V)

 

[acongdon]

This is the modbus documentation for this device.