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Appendix A - Glossary
This guide uses the following terms:
• AC: Abbreviation for Alternating Current.
• AFCI: Abbreviation for Arc-Fault Circuit Interrupters.
• Ah: Abbreviation for “ampere-hour”. Unit of electrical charge, one ampere-hour is the
charge provided by a constant current of 1 A over a period of one hour.
• AHJ: Abbreviation for Authority Having Jurisdiction.
• AI: Abbreviation for Anti-islanding.
• Anti-islanding protection: This is for AC grid monitoring and is an automatic isolation
point distributed energy resources.
• Backup panel: A separate panel other than main electrical panel which has the protected
home loads
• Backup loads: are also called protected home loads which are moved from main
electrical panel to back-up panel for operating when in grid blackout state.
• BOS (Balance of System): All the equipment used in the installation other than inverter
and battery pack are called BOS. Typically it is referred to conduits, wiring, panels etc.
• Basic Insulation: Insulation to provide basic protection against electric shock.
• Battery Pack: A battery pack is an electrochemical energy storage device that can
release previously stored chemical energy as electrical energy.
• Battery Pack Backup System: Battery pack backup systems are power supply systems
that provide power under utility grid blackout.
• Battery Pack Charge Mode: Operating mode of the inverter in which the inverter takes
energy from the PV array and/or AC grid to recharge the battery pack in a controlled way.
• C rate: The nominal capacity specification is always provided with the discharge time on
which the capacity is based.
• Capacity: Describes the storage capability of a battery, specified in Wh (Watt-hour). The
capacity of a battery is heavily dependent on the State of Charge (SOC), operating power
and the temperature.
• CAN: Controller Area Network; communications standard that allows communication
between microcontrollers and other devices without the need for a host computer.
• CEC: Abbreviation for the California Energy Commission.
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