Tomeek
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Tomeek reacted to Coulomb in BETA FIRMWARE AXPERT MAX 8 KW >>>MPPT improvement<<< (Based on stable 90.06)@Tomeek, thanks for the detailed testing. It seems that 0.50 A (as per factory firmware) is too high a current threshold, and 0.05 A (as per Georg594's original 90.06 based patches) may be too small. 0.25 A seems to be best for you, but perhaps some lower value yet larger than 0.05 is better still.
In the pursuit of the ideal current threshold, I've made MPPT1 0.25 A as requested, and MPPT2 half that at 0.12 A. That's still 2.4x large than 0.05 A. No other MPPT patches are made. The only other changes are that the firmware reports version 372.66 to monitoring software, and the premature float bug is fixed. Tomeek or others, if you could compare the performance of MPPT1 versus MPPT2 and report the results here, that would be great.
I'm happy to make another patched version with whichever current threshold seems to work best, for both MPPTs. It's comparatively little extra work now that I have 372.66 written.
This is patched firmware version 372.66 for the Axpert Max E 8 kW '28066 non-Twin. Do not use with any other model or chipset. It is the latest of the available 72.xx firmware versions that has the "presumed good" MPPT logic, has the QDOP command, and does not have the bug with reading the serial number. The current threshold for MPPT1 is reduced from 0.50 A to 0.25 A, and for MPPT2 from 0.50 A to 0.12 A. Use at you own risk.
Firmware upload instructions for models with a removable display.
dsp 372.66 patched 25 12 Max E 8kW 28066 non-Twin.zip
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Tomeek got a reaction from Coulomb in BETA FIRMWARE AXPERT MAX 8 KW >>>MPPT improvement<<< (Based on stable 90.06)My experience:
Axpert Max 8k 28066
Both solutions worked for me for the stuck 90V problem!
If you are brave enough, disconnect the solar connector from the additional power supply and the factory: 72.66 FW
(Consumes approx. 40 W from grid or battery, even in sunlight)
If you don't want to install it electrically... 272.66 CFW could be the solution
PS: (If the RGB LED is turned off by the user before the firmware update, then the RGB LED will glow dim red after the update.
Turn on the led strip before updating, and turn it off after updating... if you don't want to see it!!)
