Power and/or energy monitor, method of using, and display device

A facility comprising:

• at least one main panel bus;
• at least one external power line electrically connecting said at least one main panel bus to at least one external power source;
• at least one energy-producing system having at least one energy-producing system bus;
• at least one first internal power line electrically connecting said at least one main panel bus to said at least one energy-producing system bus;
• at least one critical load sub-panel bus;
• at least one second internal power line electrically connecting said at least one energy-producing system bus to said at least one critical load sub-panel bus;
• a first sensor which senses a magnitude of power being consumed by said facility;
• and
• a second sensor which senses a magnitude of power being produced by said at least one energy-producing system,
• said first sensor comprising at least one first sub-sensor and at least one second sub-sensor;
• said first sub-sensor sensing a current passing through said at least one external power line;
• said second sub-sensor sensing a net current passing through a combination comprising said at least one first internal power line and said at least one second internal power line;
• said second sensor comprising at least one third sub-sensor, said third sub-sensor sensing said net current passing through said combination comprising said at least one first internal power line and said at least one second internal power line.

A method of sensing power in a site facility, comprising:

• sensing a magnitude of power being consumed by a site facility by:
• sensing current passing through at least one external power line, said at least one external power line electrically connecting at least one main panel bus to at least one external power source, and
• sensing net current passing through a combination comprising at least one first internal power line and at least one second internal power line, said at least one first internal power line electrically connecting said at least one main panel bus to at least one energy-producing system bus, said at least one second internal power line electric ally connecting said at least one energy-producing system bus to at least one critical load sub-panel bus;
• and
• sensing a magnitude of power being produced by said at least one energy-producing system by:
• sensing said net current passing through said combination comprising said at least one first internal power line and said at least one second internal power line.

A display device comprising:

• at least one site facility consumption display area;
• at least one energy-producing system production display area;
• and
• a first switch which, when pressed, toggles between a setting where an indication of a magnitude of power being consumed by a site facility is displayed in said site facility consumption display area and a setting where an indication of energy consumed by said site facility over a period of time is displayed in said site facility consumption display area;
• and
• a second switch which, when pressed, toggles between a setting where an indication of a magnitude of power being produced by said energy-producing system is displayed in said energy-producing system production display area and a setting where an indication of energy produced by said energy-producing system over a period of rime is displayed in said energy-producing system production display area.

A monitor comprising:

• a first sensor which senses a magnitude of a first net current passing through at least a first power line and which generates a first signal having a voltage which is proportional to said first net current;
• a second sensor which senses a magnitude of a second net current passing through at least a second power line and which generates a second signal having a voltage which is proportional to said second net current;
• and
• a transducer comprising at least one circuit in which said first sensor and said second sensor are connected in series.

A monitor comprising:

• a first sensor which senses a magnitude of power being consumed by a site facility, said site facility comprising at least one main panel bus, at least one external power line electrically connecting said at least one main panel bus to at least one external power source, at least one energy-producing system having at least one energy-producing system bus, at least one first internal power line electrically connecting said at least one main panel bus to said at least one energy-producing system bus;
• said first sensor comprising at least one first sub-sensor and at least one second sub-sensor;
• said first sub-sensor sensing a current passing through said at least one external power line;
• said second sub-sensor sensing a current passing through said at least one first internal power line;
• and
• a second sensor which senses a magnitude of power being produced by said at least one energy-producing system;
• said second sensor comprising at least one third sub-sensor, said third sub-sensor sensing said current passing through said at least one first internal power line.