Darek
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Darek reacted to Coulomb in BETA FIRMWARE AXPERT MAX 8 KW >>>MPPT improvement<<< (Based on stable 90.06)You can install any of the patched firmware that is for the Axpert E 8 kW and the '28066 processor; at present, that's 92.06, 292.04, 392.04, and 272.66.
272.66 is based on the most recent factory firmware, but it only changes the two current compare statements. Present "best practice" seems to be to make a few more changes. So you may be better off with 92.06, unless you have a particularly high PV voltage, where 392.04 may be better (300 V minimum MPPT).
Just search for the appropriate numbers in this forum. I suggest that you start with 272.66.