They might have a RS485 interface. I could try to attach a Modus coupler to it to test if I get any data via Modbus TCP by that way. But that is all new terrain for me…
Some experience (in German), that doesn’t sound too inviting:
IMHO parsing html is not really a good approch for an Energy Management System as it can be unstable (Updates break Implementation easily).
Maybe an external Meter for the Inverters which are not controllable would suit the Case better.
Not true, they use RS485 Serial for Communication which is also a way to read Data from the Devices. You could Implement a Serial → TCP converter on site, so you have TCP available.
I contacted Kostal about modbus access and firmware updates. The expert is currently out of office. I’m hoping for a reply next week.
Modbus RTU via RS485 should be available. A firmware update is not available. I got a specification document, with the Modbus registers. But it was not clear if the spec fits to our inverter models.
What do you think? If there is no update and modbus registers are not known - should we try to inspect the html? If you agree and provide a static html (just download the power value overview) it should be possible to help implementing a component only providing values as PV inverter implementation.
I’m awaiting additional information from Kostal (Modbus TCP, firmware update), but don’t expect much more news.
If Modbus RTU via RS485 is the way to go, I’ll need some time to connect the inverters to a modbus RTU to TCP coupler. Then it hopefully is possible to implement a component, that can not only read, but also control the inverter.
Didn’t get much more info – and hope for being able to control them was low by Kostal.
I’m away the upcoming weeks, but will try to read out data via RS485 once I’m back.