Island Mode; Sleep Mode; Power Search - Generac Power Systems PWRcell M3 Owner's Manual

General Information

Island Mode

In the event of a grid outage, the PWRcell Inverter enters
Island Mode. While in Island Mode, the inverter
disconnects from the utility grid and powers the building
from the REbus nanogrid.
In a typical solar-plus-storage configuration, this means
all REbus-connected batteries will work together with the
PV links to supply power to REbus. The inverter will pull
power from REbus to provide AC power to protected
loads.
NOTE: To enter Island Mode, the inverter setpoint,
EnaIslanding, must be set to 'ON' (default value) and the
system mode can not be set to Grid Tie. See the
Generac PWRcell Inverter Owner's Manual for more
information.
NOTE: If EnaIslanding is set to "OFF" when an outage
occurs, the inverter will disconnect from the grid and
enter Standby state if DC power is available from REbus
devices. If DC power is not available from REbus
devices, the inverter will de-energize. The inverter will not
send power to local loads in this state.

Sleep Mode

While in Island Mode, the battery charges from REbus
when PV power is greater than local load demand. Once
PV power drops below local load demand, the battery will
discharge to supplement powering protected loads,
lowering its state of charge (SoC). Once the battery SoC
reaches the Min Absolute setpoint, the system enters
Sleep Mode. In Sleep Mode, the inverter will power down
and the protected loads will lose power. See
State of Charge (SoC) Setpoints
12
Battery
for more information.

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, the battery performs Power
Searches at regular intervals. See
During a Power Search, the battery wakes up, powers
the REbus nanogrid, and scans for potential sources of
power. If a PV Link or another source of power is
available, the battery will begin charging. Once the
battery SoC is 5% above the Min Absolute SoC setpoint,
the PWRcell system will resume exporting power to
support backup loads when islanded. If Power Search
does not discover other sources of power, the battery
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.
Table 2-4. Default Power Search Values
Setpoint Description
Sleep Time Minutes between Power Searches
PowSrch Time Minutes
REbus energized
The battery 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 the battery
depletes its Power Search reserve, the battery 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 and turn the REbus
DC disconnect for the battery OFF at the inverter
whenever the PWRcell Battery or Inverter will be
powered down and left inactive for long periods of time.
Owner's Manual for Generac PWRcell Battery
(000599)
Table 2-4.
Default
60 min
Power Search keeps
for more
4 min