Migration strategy

Questions
#1

I will soon install a second PV system. I have studied the data aggregation section in the wiki but I’m not sure as to how to proceed.

Current system: system A
New system: system B
New parent system: C

I would like to achieve the following:

  1. reuse the name of the current system A as the name for the new parent system C
  2. create a new child system with all the data from the current system A
  3. create a new child system B
  4. aggregate all data to the new parent C without loosing any data from system A

My concern is that if I start experimenting I may loose data. Is the above possible and if so what are the steps I need to take?

#2

Note that Data Aggregation only affects live data from the time it is enabled - i.e. historic data won’t be copied from the children to the parent.

#3

That is certainly useful (even essential) to know but can you spell out the steps required to meet my requirements?

#4

There are two options, both don’t involve data aggregation.

  1. Create new System B and start uploading to B. Existing System A will still have its data.
  2. Update existing System A details to match that of new install, upload to this system.

Data aggregation is more suited for combining multiple inverters or consumption + generation scenarios.

#5

Thank you. If I understand this correctly, System A will become the parent, keeping all legacy data and aggregating new data from System B, System B will become the current system with data from its creation time onward and I will have to create a new child, System C for the new inverter.

Did I get this right?

#6

System A will keep its historic data. By making A the parent of B, any new live data added to B will be copied to A.

Note that the kWh/kW figures on A will be incorrect for the data copied from B, as the sizes of the old and new system will be different.

System C won’t be necessary unless you wish to combine B and C to A.

#7

Sorry for not getting this. I’m not going to replace the current system (A) with a new system B. I’m adding a new system B. I need to aggregate both the current A and the new B into the parent C. I get the impression that your answers assume that I’m replacing A with B.
Summary (without referring to any letter names):

  • current system (need to preserve historic data)
  • new system (will start uploading new data)
  • new parent system (needs to show aggregated data, including historic data)
#8

Aggregation only works on new live data - the new parent system will not have any historic data, only the combined live data of any children assigned to it.