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Hi, I suspect that the power hit to the TV AC feed (if that is what is happening) would be so fast that a regular voltmeter would probably either not show it or would be just too slow to react to it. Remember if it is a momentary power dip/spike caused by the inverter (we don't know that for sure but suspect it), the microwave display survives it while the TVs do not.....they shut off. Perhaps another brand of TV would not see it either? I suspect an oscilloscope across the line with suitable protections would be able to capture a pulse or at least help track down the culprit. Probably the easiest approach is just replace the inverter temporarily (under warrantee) and see if the problem goes away. Maybe the dealer has seen this one before too? For all we know at the moment it could just be a bad transfer relay in the inverter (contacts or something strange). The 30 minute interval is still the real head scratcher part.
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