I am looking for some advise/best practice.
I have a solar setup with two MPPT strings for the solar input.
These are accessible via two ModBus registers which I am able to read. I will be linking these to ITEMS to carry the values for the two strings of panels
I however would also like to get the TOTAL Solar Generation - which would be the sum of the two registers. I would like to populate this to an ITEM as well.
What is the BEST way to achieve this?
- Run a rule for every change on the two ITEMS and calculate the sum?
- Have a transformation to calculate the third item? How to access the individual register data for the two ?
- Some other more clever/efficient way?
Any advise would be appreciated - this is my first delve into ModBus etc.