PIKA Harbor Flex SB10p, Operation Manual

Page: 17 / 27

15 Harbor Smart Battery Operation Manual M00017-02
Section 4: Powering the Nanogrid Without Utility Power
Section 4: Powering the Nanogrid Without Utili-
ty Power
Islanding
In the event of a grid outage, the Energy Island enters Islanding Mode: the Islanding Inverter
disconnects from the utility grid and powers the building from the REbus Nanogrid.
In a typical solar-plus-storage configuration, this means that all REbus-connected smart batteries
(including Harbor) will work together with the PV Links to supply power to REbus. The Inverter
will pull power off of REbus to provide AC power to the building.
Power Search
While the system is in Islanding Mode, Harbor may charge from PV power if there is plenty of
sunlight and not much load from the building. However, if Harbor provides power to the building
loads, then its State of Charge (SoC) will go down. Once the SoC reaches the Min Absolute
setpoint (described above), Harbor will enter a sleep state, the Islanding Inverter will shut down,
and the building will lose power.
While it is sleeping, the Harbor battery spends most of its time in a very low power state. Every 30
minutes, Harbor will perform a Power Search. During a Power Search, Harbor wakes up, energizes
the REbus Nanogrid to 380VDC and scans for potential sources of power. If there is another
source of power available, such as PV Link, then Harbor will begin charging. Once Harbor’s SOC
is 10% above the Min Absolute setpoint, it will supply power to the rest of the Nanogrid, allowing
the Inverter to operate in Islanding Mode.
However, if the Power Search does not discover any other sources of power, then Harbor will
return to sleep to conserve energy. The Power Search will maintain 380VDC on REbus for 60
seconds before Harbor returns to sleep.
Harbor can only perform a Power Search a certain number of times before it runs out of energy
completely; the number of scans available is dependent on the value of the Min Absolute
setpoint. Once Harbor depletes its Power Search reserve, it will not energize the REbus Nanogrid
on its own. Another source of power is necessary to energize REbus and charge the battery.