Active Power Limit

[vbreemen]

I have question about the SolarEdge active power limit and hope someone can help.

In the MySolarEdge app you can read the inverter active power limit as a percentage. 
The value in both the app and delivered by the web API (powerLimit %) is actually below 100% and correct when the inverter is throttling.

When reading the modbus Sunspec registers, all known (to me) registers for reading power limit percentages always stay on 100%.
I tried these from the sunspec-implementation-technical-note and Power Control Open Protocol for SolarEdge Inverters documents:

Name                                                            Address dec / hex
I_Active_Power_Limit                                 61441 / F001
I_Dynamic_Active_Power_Limit               62242 / F322
I_Dynamic_Reactive_Power_Limit           62244 / F324
I_PowerReduce                                           61760 / F140

They all always return 100%
Does anyone know what is the correct register, or the calculation to get the correct percentage?

 

[WillCodeForCats]

There isn't a calculation, the registers are a direct read.

Example in code for 61441:

solaredge-modbus-multi/custom_components/solaredge_modbus_multi/hub.py

Line 1059 in fbb0197

("I_Power_Limit", decoder.decode_16bit_uint()),

solaredge-modbus-multi/custom_components/solaredge_modbus_multi/number.py

Line 536 in fbb0197

return self._platform.decoded_model["I_Power_Limit"]

Decoded as a 16 bit unsigned integer, and the value is returned directly to HA. So if that value never changes, something else is happening or the inverter itself has a firmware bug.

[vbreemen]

It just became unavailable about two weeks ago. First thought I had was that something changed in the inverter.
I haven't found the time yet to dive into it.

[DamijanD]

I know that I experimentally enabled power control and then disabled it back. Is it possible that this somehow disabled these properties? What would HA get from integration if (for some reason) integration couldn't read value from modbus? Probably entity would still exist just value would be undefined?

[DamijanD]

@vbreemen this option is important for these "advanced" entities: Auto-Detect Additional Entities, when I enabled this all missing entities showed up.
Again thx @WillCodeForCats

[vbreemen]

Works. Thanks!

[WillCodeForCats]

Please remember to read the release notes, since some defaults have changed for some options and entity names. Existing settings are preserved on upgrade, but if the integration or hub is re-added/removed the new defaults will apply.

https://github.com/WillCodeForCats/solaredge-modbus-multi/releases/tag/v3.0.0

[vbreemen]

I eventually found the answer on my original question about the powerLimit % in the MySolarEdge app when throttling and in hindsight it's pretty obvious.
It's not in a separate register but a calculated value. When the inverter is throttling (register 40407 value 5) , it's the actual power (register 40083) divided by the maximum power limit of the inverter (register 62220).