The inverters do sync themselves with the grid phase.Well, this is where I think we will get stuck without adding additional outdoor sensors.
In order for the compressor to use the solar panels or mains (if the panels were low), there would need to be:
A - Switching components somewhere to switch back and forth between mains and Solar.
B - Matched phases so that the AC compressor can draw 95% from Solar and 5% from mains.
Measuring current from the inverter would not work unless it was providing power in parallel with mains. Measuring DC voltage across the panels would give you some funny results, as the voltage would drop considerable under load.
You may need to reconsider Colin's suggestion, perhaps by using either small calculator sized panels on each major face of solar panels you have constructed, or photoresistor/diodes.
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