Appendix A Definitions - Generac Power Systems PWRcell Reference Manual

Definitions
Appendix A
The following is a limited definition of terms and acronyms that define the technology used with a Generac PWRcelll
system. Understanding these terms is important for proper and successful diagnosis of connectivity issues.
Term / Acronym
AC-Coupling
Black Start
Black Start Battery
DC-Coupling
DCB
DHCP
High-Voc
MC4
MPPT
Parallel Circuit
PLM
Protected loads
PV
PV Link Optimizers
PVRSS
Racking
RCPn
REbus
REbus Home run
Series Circuit
Diagnostic Repair Manual
Description
Commonly refers to an energy storage system being wired to the AC side of a solar
output.
To manually enable the battery and energize REbus using the battery disconnect
switch—typically done when no utility grid power is available.
The small 12V lead/acid battery located left-center on the Battery Management Unit
(BMU). Required for performing a system black start.
Commonly refers to energy storage being wired to the DC side of an inverter along with
PV power from the solar array.
Panasonic Battery Module
Dynamic Host Configuration Protocol
Typically refers to 96 cell type solar panels (as opposed to lower Voc of 60 cell type
solar panels).
Common connectors for connecting solar panels and other components in a solar array.
Maximum Power Point Tracking
Components are connected between the same set of electrically common points (e.g.
positive gets connected to positive and negative gets connected to negative). Current
flowing through each component will increase to be the sum of each component, while
voltage will remain the same across the circuit.
Power Line Modem
House or building loads that will be isolated from the grid and energized by the PWRcell
system during an outage.
Abbreviation for photovoltaic. Commonly used as shorthand to describe power from
solar panels.
Generac's substring solar optimizers—DC to DC converters that optimize for MPPT,
detect arc fault/ground fault, and facilitate the PVRSS.
Photovoltaic Rapid Shutdown System
Metal rails mounted on a roof or ground mount to hold solar panels
REbus Control Protocol Number
Renewable Energy bus—Generac's patented bi-directional DC bus for PWRcell
equipment.
A set of three wires (positive, negative, and ground) landed at one of the four DC
disconnects at the inverter. May be wired to one battery or up to three PV Links on the
other end.
Components are connected end-to-end to form a single path for current to flow. Current
flowing through each component will remain the same, while voltage will increase to
equal the sum of the voltages across each component.

Appendix A Definitions

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