What creates the (all) inverters switch off limitation for ECU-B?

[skinkie]

Considering the AP-systems ECU's are effectively a Zigbee router. What makes the limitation that the ECU-B can't switch off the inverters (or individual inverters). Is this related towards a missing "API" interface or is there something fundamentally different towards the more expensive ECU's?

[HAEdwin]

The ECU-B is a "lightweight" version (and cheaper to buy). I don't know if the hardware is different, but the firmware certainly is. Unlike the other models, functionality is limited to four panels and therefor suitable for small installations. If you plan to install more than four panels in the future or expand your PV, the ECU-B is not the right choice. Thing is that if the option to switch off inverters was there, I would certainly have included in this integration. However, since a web interface is missing on the ECU-B and ECU-R (2160 series), the additional functions are also missing.

[skinkie]

Thanks. I am on he 2163 (given thet output in HomeAssistant). I'll see if it is possible to probe around a bit. The alternative of building a custom Zigbee interface still sounds attractive.

[HAEdwin]

Yes, but be aware of the limitations: the bad firmware of the early DS3 series could not be corrected without an APsystems ECU for example and you miss the EMA. The advantage is the cloud independence.

[skinkie]

@HAEdwin the only thing I am interested in is cloud independence. So I general I choose a modbus connection over anything ;) But it is always nice to toy around with other devices, so I have a few apsystems devices laying around to test with. And I hoped the ECU-B would be enough. But especially for the ability to switch the devices off during negaive pricing it would be nice to get this to work.