I did an off grid test with my system the other day and I let the frequency got up to 64HZ and the Powerwall+ shut off the solar but the Enphase did not do any curtailment at all. I need to call Enphase to see if I can get them to take action or give me control so I can try and figure it out.Enphase has a white paper specifically for PowerWalls. I think all interaction between IQs and PWs should be controlled by profile, not firmware itself. Enphase has plenty of standard profiles with different curves and delays for frequency shifts. It is also possible to create custom profile but I did not figure our procedure for it.
I am surprised that 1 PW was approved for this size PV system. PW has a clear stated charge limit and unless PV branches can be split I do not see how PW can protect itself from taking too much charging current fast enough.
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