HV2600 BMS capacity gone haywire since firmware update

[andrewmoore]

Hi all,

On 11th November, the firmware for my H1-5.0 inverter and BMS/batteries was updated. Since then, the battery capacity estimation from the BMS has been all over the place.

I have 5x HV2600 V2 batteries and prior to the upgrade, my estimated max capacity was ~10.25 kWh. As seen from this graph, after the update the max capacity is completely wrong, with estimations as high as 67.67 kWh.

• Inverter Manager: 1.74
• Inverter Master: 1.65
• Inverter Slave: 1.02
• Battery Master: 2.000
• Battery Slaves: 1.13

My concern is that the Battery Master version is a very fresh 2.000, which was released very recently.

Anyone else on this firmware or have any ideas? I've done the usual slow charge up at 5A to help the BMS calibrate.

[reef]

The update to Manager 1.74 and Master 1.65 caused all sorts of issues for me. Initially after the update, it said I generated 131kWh of solar that day and had a yield of 0.0kWh, the next two days it then did not count up at all from zero. Fortunately this seems to have now solved itself.

I updated my Mira HV25 batteries to the latest firmware a few months ago and again had balancing issues, my SOC would jump from 80-85% straight to 100% when charging and I wasn't getting the capacity expected either. Again, this seems to have corrected after a while, so it may be that it just screws up the balancing and takes a while for the BMS to figure things out.

[Will]

What integration are you using? the modbus addresses have completely changed in newer firmwares

[andrewmoore]

The update to Manager 1.74 and Master 1.65 caused all sorts of issues for me. Initially after the update, it said I generated 131kWh of solar that day and had a yield of 0.0kWh, the next two days it then did not count up at all from zero. Fortunately this seems to have now solved itself.

I updated my Mira HV25 batteries to the latest firmware a few months ago and again had balancing issues, my SOC would jump from 80-85% straight to 100% when charging and I wasn't getting the capacity expected either. Again, this seems to have corrected after a while, so it may be that it just screws up the balancing and takes a while for the BMS to figure things out.

Thanks. I've not had any other issues from the inverter update, to be honest, all seems okay. It's just the BMS calibration that's off.

Hopefully after a few 10%-100% cycles it sorts itself out.

[andrewmoore]

What integration are you using? the modbus addresses have completely changed in newer firmwares

I'm using the latest version of https://github.com/nathanmarlor/foxess_modbus.

To calculate max capacity I'm just doing:

Code: Select all

sensor.bms_kwh_remaining / sensor.battery_soc * 100

[Will]

I'm not sure thats correct any more. On newer firmware sensor.bmw_kwh_remaining shows the capacity and not the remaining.
See https://github.com/nathanmarlor/foxess_ ... issues/651 for more info.

[andrewmoore]

I'm not sure thats correct any more. On newer firmware sensor.bmw_kwh_remaining shows the capacity and not the remaining.
See https://github.com/nathanmarlor/foxess_ ... issues/651 for more info.

Oh, interesting! That's the issue with making such a big jump in firmware, easier to lose track of big changes.

That explains a lot. Thanks for the info.

[Will]

Welcome