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General Information
Islanding Mode
In the event of a grid outage, Generac PWRcell enters
Islanding Mode. During Islanding Mode, the Generac
PWRcell Inverter disconnects from the utility grid and
powers the building from the REbus Nanogrid.
In a typical solar-plus-storage configuration, this means
the Generac PWRcell Battery and all REbus-connected
batteries will work together with Generac PWRcell PV
links to supply power to REbus. The Generac PWRcell
Inverter will pull power off of REbus to provide AC power
to the building.
NOTE: To island during a power grid outage, the
Generac PWRcell Inverter NoIslanding setpoint must be
set to "0" and the system mode can not be set to Grid Tie.
See the Generac PWRcell Inverter Owner's Manual for
more information.
Sleep Mode
While in Islanding Mode, Generac PWRcell charges from
REbus when PV power is greater than local demand.
However, as Generac PWRcell provides power to
building loads, its state of charge (SoC) decreases. Once
the SoC reaches the Min Absolute setpoint, Generac
PWRcell enters Sleep Mode. In Sleep Mode, the
Generac PWRcell Inverter shuts down, and the building
loses power. See
Battery State of Charge (SoC)
Setpoints
for more information.
10
Power Search
DANGER
Electrocution. Turn battery disconnect OFF and
.
de-energize REbus before touching terminals.
Failure to do so will result in death, serious injury,
equipment and property damage.
While in Sleep Mode, Generac PWRcell performs Power
Searches at regular intervals.
During a Power Search, Generac PWRcell wakes up,
energizes the REbus Nanogrid, and scans for potential
sources of power. If the Generac PWRcell PV Link or
another source of power is available, then the Generac
PWRcell Battery begins charging. Once Generac
PWRcell's SoC is 5% above the Min Absolute SoC
setpoint, Generac PWRcell allows the inverter to island.
If Power Search does not discover other sources of
power, Generac PWRcell returns to sleep to conserve
energy.
The length of time Power Search keeps REbus
energized before returning to sleep and the Power
Search interval are user-adjustable and are set on the
inverter control panel. See the Generac PWRcell Inverter
Owner's Manual for more information.
Table 2-3. Default Power Search Values
Setpoint
Description
Sleep Time
Minutes between Power
Searches
PowSrch Time
Minutes Power Search
keeps REbus energized
Generac PWRcell can only perform a Power Search a
certain number of times before it runs out of energy
completely. The number of searches available is
dependent on the value of the Min Absolute Soc setpoint.
Once Generac PWRcell depletes its Power Search
reserve, Generac PWRcell will not energize the REbus
Nanogrid on its own. Another source of power is required
to energize REbus and charge the battery.
See
Battery State of Charge (SoC) Setpoints
information.
NOTE: Turn Battery Disconnect OFF whenever Generac
PWRcell Inverter will be disabled for a long period of
time. This prevents Power Search from running the
battery down below its minimum SoC.
Owner's Manual for Genera PWRcell Battery
(000599)
Default
60
4
for more
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