Hi @ssalonen,
thank you for your quick reply.
I want to clarify, that I didn’t mean to critizise your documentation 
Maybe I just don’t understand modbus addressing well enought.
I think I want to poll input registers, but to be honest I assume this regarding the register number from the SMA Docu “30535”. It is also read only which would also perfectly fit to input register.
Thank you for your support!