Arne Bosch
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Hi Arne, I can highly recommend the patched version 269.61 - my Kodak OG 7.2 just works perfectly with this firmware.
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Arne Bosch reacted to Coulomb in Parameter 12 Voltronic48 V for a 15S battery is 48/15 = 3.20 VPC. Assuming light loads, that's already well down the sloping part of the voltage versus SoC curve, so we can say that this is about 14-15% SoC. If you have higher loads, then the SoC is actually a little higher at that battery voltage, assuming no compensation for loads.
Personally, I try to keep my LFP cells above 20% SoC, even though the latest trend seems to be to go down to 10% SoC. That's why I suggest a higher setting 29, making the effective SoC for setting 12 more like 48.5 V, though that might be getting closer to 25% SoC. So perhaps 46.2 V for setting 29.
You really need to experiment with these values.
Those are rather old now. Consider upgrading to main (U1, DSP) version 69.70, and removable display version 12.28.
This is factory firmware version 69.70 for the Axpert Max E 7.2 kW non-twin, with the '28066 DSP. Do not use with any other model, not even other Axpert Max 7.2 kW models whose existing firmware doesn't start with "69". Use at your own risk. Hex file is dated 6th March, 2024.
Firmware upload instructions for models with a removable display.
MAX_HV7.2K_MAIN_6970.7z
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As I answered in a PM:
It sounds a bit like an issue that I think Axpert Kings had, but I might be misremembering. So it's possible that it's a problem that Voltronic firmware engineers are prone to making.
The latest 69.xx firmware that I know of is 69.70, from March this year. 69.07 is from September last year. Maybe they realised that they made that mistake again, and made an "experimental" firmware (these seem to be ones with 60 or higher minor (after the dot) version numbers; it used to be 90 or higher major (before the dot) version numbers).
So it's probably worth trying main firmware version 69.70:
https://powerforum.co.za/?app=core&module=members&controller=profile&id=31924
It takes a lot of time comparing firmwares, and I've not done it for this pair, to see what they changed.