Windy. Here is a wild one that may only be food for thought
 
The RMS VAC seems to correspond  to the 210 peak  ( .707 x 210 = 148)
 
Since the negatives are common to both inverters internally what if the lighting caused a very small short in one of the inverters transformers and is now acting as a center tap (.707 1/2 square root of two for full sine wave) acting like a higher turns ratio of primary to secondary.The short of the windings probably would not cause an overcurrent trip if the sum of the potentials across both circuits is still zero.
 
Just sitting here pondering this whole thing and that is the first thing I came up with. I know it is wild and really challenges my elect 101.
These are the problems that drive us up a wall. Just makes wrenches that much better than mister "sit behind the desk and take orders"
Hah! Hah!
 
Larry
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