Total Battery Life Cycles and Battery SOH show low/high values

[PV-Joe]

Hi David,

The sensor „Total Battery Life Cycles“ and Battery SOH shows low/high values in my opinion.

My battery: 1x Pytes E-Box 5,12 KW (running since two years)

Config Solarman:

Did I misconfigure or is it a bug?

[davidrapan]

What is your "Corrected Capacity" from Battery attributes?

Edit: And also set "Battery Capacity" in configuration for the reccord..

[PV-Joe]

Sorry, I might be dumb but really don’t know what to do.

I did not correct anything and don’t know where I have to.

Battery Capacity is:

[davidrapan]

So Battery Capacity is set ~ correctly (according info you provided).

And the Corrected Capacity can be seen here:

[PV-Joe]

Here is mine:

Did I miss something?

[davidrapan]

So yeah your inverter thinks you have 10 kWh battery. You can correct that by switching your inverter battery control to: "Use Batt %" and let it run in that mode until your Corrected Capacity value does not correct itself to ~ your set Battery Capacity. But it's kinda important you also have correctly set other values about your batt for inverter to work properly in that mode.

And after you switch it then the values should be cca like this:

• Important is to set Equalization Days and Hours and also TEMPCO to 0.
• Ignore Shutdown Low Batt and Restart.
• And Float Absorbption and Equalization should be set to the same value which shows you "Battery Charge Voltage" on the BMS screen (When you click on the Battery and then Li-BMS, this screen is visible only in Lithium mode!).

I have Float lowered cause otherwise my Battery is somewhat messed up and shows OVP when there is anything higher than 52.2 V.

I have Automation setup which is switching my inverter automatically into this mode when is Battery fully charged cause my Battery keeps cycling charging and discharging when left in Lithium mode and is fully charged cause one of the packs is returning OVP. And then when the charged SOC drops under 98% Automation does switch back to Lithium mode. As I said there is something wrong with the BMS controller in my battery.

[PV-Joe]

Thanks for explaining!

My solar technician chose the battery settings and I never changed anything. As I don’t really know what exactly I’m doing by changing values I’d rather leave it like he set it up.

My battery cycles when it is full from 99% to 100% and back to 99% and so on if you mean that.

I there another way of getting the sensor going?

[davidrapan]

My solar technician chose the battery settings and I never changed anything.

If that's the case I don't understand why is your Battery Corrected Capacity not showing +- the same value as it's setup in Battery Capacity. Battery Corrected Capacity is just value which is set by the device itself according setup value in the setting and Battery balancing which should be done during the installation.

My battery cycles when it is full from 99% to 100% and back to 99% and so on if you mean that.

Really? It shouldn't do that. If there is enough PV and battery is not needed it should stay idle.

What is your Battery BMS Alarm doing during that cycling?

Does this "cycling" also affects Grid Import/Export? Meaning do you see that it cycling means charging/discharging from/to grid?

[PV-Joe]

No, no charging or discharging from grid at all. Experts told me, that it is normal for Lithium batteries and is because of cell balancing.

So is there a way to get the sensors running by modifying something in the integration or Home Assistant itself?

If yes, how exactly should I do it?

[davidrapan]

No, no charging or discharging from grid at all. Experts told me, that it is normal for Lithium batteries and is because of cell balancing.

Oh yeah that in fact is normal but not really every time or all the time. It should stop after is the balancing somehow done.

I still do wonder what is your Battery BMS Alarm showing when is your battery full? Does it stays Inactive the whole time?

But anyway mine do that cycling of charging/discharging from/to grid when full so that's why I have setup that "hack".

So is there a way to get the sensors running by modifying something in the integration or Home Assistant itself?

I'll see what I can do about it. 😉

[PV-Joe]

Battery BMS Alarm says “inactive” since switching to your integration.

Maybe you could make the installed battery capacity configurable in the setup menue?

Otherwhise I could help myself with template sensor for Battery SOH.

Just asked ChatGPT and this is the result:

sensor:
  - platform: template
    sensors:
      battery_soh:
        friendly_name: "Battery SOH"
        unit_of_measurement: "%"
        value_template: >
          {% set battery_capacity = 5.12 %}
          {% set life_cycle = 6000 %}
          {% set total_capacity_kwh = battery_capacity * life_cycle %}
          {% set consumed_kwh = states('sensor.solarman_total_battery_charge') | float(0) %}
          {% set soh_percentage = (consumed_kwh / total_capacity_kwh) * 100 %}
          {% set result_soh = 100 - soh_percentage %}
          {{ result_soh | round(2) }}

[davidrapan]

Maybe you could make the installed battery capacity configurable in the setup menue?

I really want this to be tied to a data from the inverter. As there are two values, one set by configuring of the inverter and the other which inverter provides using one of the registers.

Maybe I could somehow detect when the provided values is way off and used the set one instead.

Just asked ChatGPT and this is the result:

Haha! That's funny! And still so scary though! 😆 He will take all the jobs from us one day. 😉

[davidrapan]

fix: Battery SOH when wrong corrected capacity

[davidrapan]

So how is it in new version?

[PV-Joe]

This is the result for my 5,12 kWh battery with 6000 lifecycles:

Can you validate?

[davidrapan]

I forgot to also do the changes for cycles: fix: Battery cycles when wrong corrected capacity

What about SOH? That should be correct for some time already.

[PV-Joe]

Here it is:

Do I just have to overwrite the *.py and it will be permanently fixed with the next update?

[davidrapan]

Do I just have to overwrite the *.py and it will be permanently fixed with the next update?

Yes. If you replace the content of sensor.py with this: https://github.com/davidrapan/ha-solarman/blob/main/custom_components/solarman/sensor.py

You have to restart HA after that, though.

[PV-Joe]

Will do it today and send my feedback here.

Thank you for your continuous and extra fast support!

[PV-Joe]

Here ist the value after replacing the sensor.py:

Are the values constistent in your opinion? If yes, we can close as completed :-)

[davidrapan]

Yes it should double as it did after the changes. So seems now okay to me. 😉

[PV-Joe]

Yes it should double as it did after the changes. So seems now okay to me. 😉

But the Battery SOH in % doesn't fit to the Lifecycles?

It should be 93,8%

[davidrapan]

6000 cycles and you are at 80% so I don't think so, hehe.

[PV-Joe]

Ahh you are setting 80% as the limit. 😂 That confused me.

I think we should add and explain that in the description to make it clear. Maybe together with the formula that is used.

It should be clear for non-experts I think and will reduce silly questions like mine 😂

[davidrapan]

There is no limit... And that is a literal description of a life cycles of the battery. 80% at 6000 cycles as the worst case scenario.

It will go past the 80%, but in the linear fashion which does not really describe the real world physics.

It's still a guess nevertheless.

[PV-Joe]

There is no limit... And that is a literal description of a life cycles of the battery. 80% at 6000 cycles as the worst case scenario.

Yes I know "limit" was the wrong word. I know these buddies can live longer.

Thinking about adding another Pytes 5.12 kWh after 2 years just because of greedyness.

This will make the calculation useless, right?

[davidrapan]

How did you calculate your number anyway? 93% after just almost 400 cycles would be really bad battery, though.

This will make the calculation useless, right?

Not necessarily. Just less precise. It is tied to the inverter anyway so replacing the battery would be the act which could render this calculation as useless. You have to keep in mind that it's just for a "having idea" about the state of the battery. Nothing you should be willing to put your hand in the fire for, though. 😆

I added this feature cause I'm charging the battery during T2 (cheaper electricity), means I'm using the battery a lot, so I wanted to know how fast is my battery proly degrading cause of that. So you should be treating the values from POV as it changes with time (delta in other words) rather than current value. You know what I mean? 😉

[PV-Joe]

How did you calculate your number anyway? 93% after just almost 400 cycles would be really bad battery, though.

I thought:

6000 cycles = 100% 372 cycles = 93,8%

... but that was rubbish as I learned 😂

This will make the calculation useless, right?

Not necessarily. Just less precise. It is tied to the inverter anyway so replacing the battery would be the act which could render this calculation as useless. You have to keep in mind that it's just for a "having idea" about the state of the battery. Nothing you should be willing to put your hand in the fire for, though. 😆

I would add not replace.

I added this feature cause I'm charging the battery during T2 (cheaper electricity), means I'm using the battery a lot, so I wanted to know how fast is my battery proly degrading cause of that. So you should be treating the values from POV as it changes with time (delta in other words) rather than current value. You know what I mean? 😉

Yeah, I like monitoring it as well. I'm mostly autark but as you have seen I don't need much energy. I'm more an enthusiast and like the technology.

[davidrapan]

I would add not replace.

I wasn't talking about your case but giving an example of what would render the values useless.

Yeah, I like monitoring it as well. I'm mostly autark but as you have seen I don't need much energy. I'm more an enthusiast and like the technology.

Maybe there could be a way of solving it by adding some kind of a offset which you would change with your battery addition. Let me know when you'll do that and we can try something. 😉

[PV-Joe]

Great news. Thank you. I will see when my technician has time for it. The Battery firmwares need to be updated to match each other and he probably wants to update the Deye Hybrid as well. Don't know if I want a Deye Update as some of them are reported as not very good.