I've ben thinking about your problem when your voltage increases on windy days. Most electrical equipment used to be designed to be able to handle a 10% voltage swing. Most of the stuff manufactured today is built to sustain a 5% swing in voltage. This is done to keep costs down.

Most inverters act as voltage regulators on the conversion from DC to AC voltage. I'd be concerned with the voltage swing you are showing and have the inverter looked at to make sure it is still operating correctly. Jim