System Modes Overview - Generac Power Systems PWRcell Reference Manual

Section 1 The PWRcell System
(H) Protected Loads
The PWRcell system offers backup power when
equipped with a battery. The system can provide a range
of backup options from a small protected loads panel up
to whole home backup. The backup capabilities of the
system are determined by the specifications of the
PWRcell Inverter and battery.

System Modes Overview

Generac PWRcell offers several system modes for various installation configurations, markets, and applications.
Connected REbus devices work together to manage the distribution of power based on the selected system mode.
Some modes interact with PWRcell batteries to store power and/or balance production and consumption.
See Table 1-1 and Table 1-2
Priority Grid Tie
Support local
1
loads.
2 Export to grid.
3 –
4 –
Goal
Net-metering solar energy without a battery.
Use grid as little as possible.
Keep batteries charged using only solar power.
Keep batteries charged as much as possible.
Export maximum power including stored energy.
Grid Tie
In Grid Tie mode, the PWRcell Inverter functions as a
conventional grid-tied inverter system. The system
powers local loads and when generation exceeds load
demand, excess power is exported to the utility for net
metering and other credits.
NOTE: Grid Tie is intended for use with systems that do
not include a PWRcell battery. For systems where a
PWRcell battery will be connected at a later date, operate
in Grid Tie mode until the battery is installed.
2
for an overview of available system modes.
Table 1-1. Grid Connected Inverter System Modes
Self Supply
Support local loads Charge batteries from
with PV and Battery.
Charge batteries
from solar.
Export to grid.
–
Table 1-2. Optimal System Mode for Goal
SnapRS (not shown)
An in-line PV Rapid Shutdown device that satisfies 2017
and 2020 NEC 690.12 within the boundary PV rapid
shutdown system (PVRSS) requirements. When used
with Generac PV Link, Generac SnapRS devices limit all
controlled conductors within an array's 1 ft (305 mm)
boundary to 80 VDC or less within 30 seconds of rapid
shutdown initiation.
Clean Backup Priority Backup
Charge batteries
solar only.
Support local loads Charge batteries
with PV.
Support local loads
Export to grid.
–
Optimal Inverter Configuration
Self Supply
NOTE: This feature requires CTs to be properly installed
and calibrated prior to use.
In Self Supply mode, the inverter prioritizes powering
local loads first using solar and/or stored power. This
mode is optimal in markets where net metering is
unavailable or unfavorable, making battery-stored power
more economically attractive than power from the utility
grid.
See 1-2. If more power is being produced by the
Figure
solar array than is needed by local loads, the inverter
stores the energy in the battery for later use.
Exports maximum
amount of power
from solar. using any energy
available.
Charge batteries
from excess solar
from grid.
with PV.
Export to grid.
Grid Tie
Self Supply
Clean Backup
Priority Backup
Sell
Diagnostic Repair Manual
Sell
energy.
–
–