I’ve recently been testing my power walls to see how they would work in an off grid situation. The power walls start off at 65Hz to 97% then to 60 Hz which lasts for about 40% of the battery life. when it gets to below 60% it drops down to 59.5 Hz 59.6 Hz etc., the problem is it 59.5 or 59.6 Hertz my enphase inverters shut off and stop producing. I know they do it at 65 Hz to not overload the battery when fully charged. The problem with the Enphase inverters is that it’s recognizing below 60Hz frequency as out of the ordinary and shutting down . Any ideas on why my power walls are producing less than 60 Hz for frequency during an off grid event?