By only having one inductor you are assuming the load is balanced. Now this being a power supply and not a load the inverters should be putting out power balanced on both hots but when only monitoring one leg you don't know for sure.
I have three amp meters that I put on panels to see how imbalanced the loads are and move breakers around to balance out the loads on a panel. With a mix of 3 phase 220 and 110 its interesting. I wish everything everywhere was three phase...
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