Simon,
The cable/connector is an Exceedcon
EC04681-2014-BF
It is almost impossible to find in small quantities online.
Depending on what you want to achieve and how much effort you want to go to
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Leave what you have in place - posting up to the Internet on the Solis/Ginlong portal - this happens every 6 minutes.
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You can then run a query against the online database - extract all the details you want and then put them into a local database for further manipulation - this will give you a maximum resolution of 6 minutes. The online portal is a rebadged one from SolarMan/Igen - the Rest API is now freely available.
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I have a docker image that i pulled down from the Internet that does this for me and then outputs MQTT to play around with
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If you want to get more into the weeds - you can disassemble the Wireless Dongle - it just pops open
In there is a 4 pin connector that you can then seperate the processing board (which is a just a rebadged ESP8285) and you can either replace that board completely and just patch into the 4 wires (+ve, -ve, RS485 A+B) - or you can make a daughter board/splicer to sit in the middle - essentially the ESP8285 duaghter board is just talking to the inverter using Modbus - so you can sit your own device in the middle and send your own Modbus commands to the inverter - this gives you the best of both worlds - the online portal still whilst you get going and then local querying and control.
My plan was to use another ESP8266 unit and interface into modbus - however one of the other users i have been in touch with has already done this using a Rpi Zero and gotten the whole thing to fit back into the wireless shell - so it looks like new
Craig