I just installed a liber10KP inverter with 4 cubix 100 rack batteries, fully charged. I set up the parameters so it will switch to grid power when it gets below the threshold I set up. I have a 120v ac input with the breaker in the on position. The ac output mode is SBU. We have had 3 days of cloudy weather and the batteries now are below the threshold I set up but it did not and will not switch to grid power. I would appreciate any suggestions and help. Thanks
