Enphase Ensemble Technology System Planning Tech Brief

Planning an Ensemble Technology System – North America

Glossary

distributed energy resource (DER): A source of electric power

that is not directly connected to a bulk power system. DER includes

both generators and energy storage technologies capable of

exporting active power to an EPS. An interconnection system or a

supplemental DER device that is necessary for compliance with

this standard is part of a DER. (IEEE 1547-2018)

intentional island: An intentionally planned electrical island that is

capable of being energized independently of the area electric

power system (EPS). Enpower and Encharge comprise a microgrid

system that forms an intentional island totally within the bounds of

the Local EPS. (2017 NEC/IEEE 1547-2018/IEEE 1547.1-2011)

main load panel: Also referred to as main load center or main

panelboard, this is unit where the majority of load circuits for the

premises have over current protection.

microgrid interconnect device (MID): A device that allows a

microgrid system to separate from and reconnect to a primary

power source. (NEC 705.2)

microgrid system: A premises wiring system that has generation,

energy storage, and load(s), or any combination thereof, that

includes the ability to disconnect from and parallel with the primary

source. (NEC 705.2)

multimode inverter: Equipment having the capabilities of both the interactive inverter and the stand-alone inverter.

(NEC 705.2)

service: The conductors and equipment for delivering electric energy from the serving utility to the wiring system of

the premises served. (NEC CMP-4)

service equipment: The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s)

and their accessories, connected to the load end of service conductors to a building or other structure, or an

otherwise designated area and intended to constitute the main control and cutoff of the supply. (NEC CMP-4)

voltage regulation: The measure of change of voltage magnitude in a component such as a feeder. Poor voltage

regulation may result in unwanted behavior such as dimming lights or flicker.