New Battery Level = sensor.battery_level - input_number.set_sg_reserved_soc_for_backup

[Sven-1974]

Hello,
I'm a big fan of this extension and started using HA just for that reason, thank you very much.
Is it possible to introduce a new entity in the next update? The battery net value minus the battery reserve value. And then stretch this again to 100%. (Net - Reserve) / (100 - Reserve) = new net.

[Gnarfoz]

Based on the SoC modified by min_soc and max_soc (Battery level, which is read from input register 13023), or based on real SoC (Battery level (nominal), which is calculated from the modified SoC)?
Or, technically possible depending on what kind of battery you have: the SoC as reported by the battery itself?

Either way, you could easily do this with a template sensor. You seem to have the formula right there. :-)
Should be something like:

{{ ((states('sensor.battery_level') | float) - (states('sensor.reserved_soc_for_backup') | float)) / (100 - (states('sensor.reserved_soc_for_backup') | float)) }}

[Sven-1974]

So many questions, because unfortunately I can't program, I solved the problem with a lot of time and AI in Nodered. I use "sensor.battery_level", i.e. the calculated net and "input_number.set_sg_reserved_soc_for_backup" with the formula already mentioned. This works well, I measure 0-100% and have them displayed via WLED on a WS2812 RGB LED from green to yellow to red and 0% violet. This way I know when I need to use energy more sparingly.
I use a Pylontech Force H2 as the battery, since the inverter and battery are connected via RS485, the "sg_battery_level" address: 13022 # reg 13023 should ultimately come from the battery.
I just thought that it might be interesting for other users too.
The question that still occurs to me is: can the inverter’s own consumption be calculated from existing values?

[Gnarfoz]

Don't sell yourself short; if you can deal with Node-RED and WLED, I'm sure you can create a template sensor using Home Assistant's web interface and a little bit of Jinja2 template expressions (see above).

Does your Pylontech battery have a way to directly check the current SoC so you can confirm that sensor.battery_level (or register 13023, they're the same thing) contains the "real" SoC?

By the way, input_number.set_sg_reserved_soc_for_backup is the value that's written in the input field to set the backup SoC.
You should probably use sensor.reserved_soc_for_backup (holding register 13100) instead, which is the actual readout of the backup SoC.

I'm not sure if there's a good (i.e. accurate) way to calculate the inverters' own energy consumption. If there was, it would probably be easy to find or already included... 🤔

[Sven-1974]

Thank you for the encouraging words. But the devil is often in the deail and then I lack knowledge, but of course I carry on.

I can access the battery via "Solarman", the values ​​match, but HA has one decimal place and "Solarman" only shows whole numbers. I'm not sure.

I replaced the input_number.set_sg_reserved_soc_for_backup with sensor.reserved_soc_for_backup.