Feature: DPL: Allow to priorize selected smart buffer powered inverters

[vaterlangen]

This feature allows the user to select smart buffer battery inverters to be used as preferred energy source by DPL.
This is useful for setups containing multiple smart buffer battery inverters with different solar power and/or battery capacity, as "strong"/primary inverters can be prioritize over "weak"/secondary inverters (allowing the "weak"/secondary to charge batteries during day while "strong"/primary inverters are used as preferred power source by the DPL)

Todo

• Use it a few days, to verify correct behavior

[github-actions]

Build Artifacts

Firmware built from this pull request's code:

• opendtu-onbattery-generic_esp32_4mb_no_ota.zip
• opendtu-onbattery-generic_esp32s3_usb.zip
• opendtu-onbattery-generic_esp32_8mb.zip
• opendtu-onbattery-generic_esp32s3.zip

Notice

• These artifacts are ZIP files containing the factory update binary as well as the OTA update binary.
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[AndreasBoehm]

Hey @vaterlangen, can you elaborate what the benefit of a prioritized inverter is? Maybe an example with some numbers?

Besides the 'why', i am also wondering if we should think this feature differently.

• what if i have 3 inverters or more?
• what if i have smart-buffer and battery inverters?
• should we in general setup a priorization list for all my inverters, no matter the power source?

[vaterlangen]

@AndreasBoehm
If you have connected multiple converters, that are connected to SmartBufferBatteries, you may need do give a priority so DPL can use the SBB with e.g. most solar power first. Otherwise, if DPL uses the device with smallest solar power over the day, the battery might be low or empty while the SBB with more solar power (that was not used during day) stucks with a full battery wasting energy.

Besides the 'why', i am also wondering if we should think this feature differently.

should we in general setup a priorization list for all my inverters, no matter the power source?

You are absolutely right - also thought about this. But as I do not have any Battery Powered Inverter, I'm unable to test ist (and I really don't like coding if I'm unable to test it).

what if i have 3 inverters or more?

Currently, it would be the same behavior within the groups. DPL uses "random" Inverter to fulfill request. But there would be 4 instead of 3 groups now.

what if i have smart-buffer and battery inverters?

If I got it right from the code, DPL currently (I'm working on multiple battery support right know) does only fully support one battery. So battery would always be last (as it was before).

From an conceptual point of view:

• solar powered inverters will not need any explicit priority as they have always highest priority (as energy is always wasted if not used)
• SBB powered inverters would need priority, as they may differ in solar power and/or battery capacity
• Battery powered inverters would also need a priority - even mixed with SBB - as configuration may also differ

So in a perfect world, we should implement something like a priority over SBB and BAT inverters.

Related stuff

These setup would likely benefit:

• 2 Growatt Noah, 2 Wechselrichter gleichmäßges laden #2416 (comment)