What does it mean if the output indicator always reads 99.9, no matter what is plugged in. I plugged in a phone and it was drawing about 7 amps. Then I plugged something in a CPAP machine to the AC and the output indicator went to 99.9, and the CPAP worked great all night and used 20% of the battery's power. Now the output indicator always reads 99.9, even when nothing is plugged in. Thanks
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