take a look in your Program Modbus

IF  GVL.AC_Running := TRUE THEN
    AC_PWR_Use := GVL.AC_Watts;
END_IF

you wanted to check GVL.AC_Running = TRUE but you set it to true.

to avoid such mistakes simply use statements like

IF xRunning THEN
    ...;
END_IF

IF NOT xRunning THEN
    ...;
END_IF

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Error result in simple ST 'IF Else' result

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