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After running my A/C all day to test the KWH on the unit my CFE meter still shows that i used power on there side and only used part of my charging. why does it not use all of my charging from my solar first then accumulate the difference on the CFE side. i produced 26 KWH on this day the CFE side said i used 18 KWH, return side was 8 KWH, my production used was 18 KWH why didn't it use all that i charged. Thanks