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2.3 Special Tools & Hardware
In addition to the standard tools required for enclosure mounting, the following tools should be readily available
to complete the installation.
Drill and hole saw kit
•
RJ-45 crimp tool and RJ-45 connectors
•
Wall mounting hardware.
•
#0 flat screwdriver
•
2.4 Functional Overview
The Power Center™ Core Hub is equipped to support an AC coupled solar plus storage installation with backup
power to a dedicated backup electrical panel. The Hub is a power distribution center for the Power Center™
Core LFP (herein referred to as the ESS), routing all AC power between the main and backup electrical panels. In
the event of a grid outage, the Hub will be energized by the ESS, which will isolate electrically from the main
electrical panel. The PV inverter's AC output is connected to the Hub to support solar charging of the battery
during a grid outage.
Solar panels
CT (home run to Hub)
communication
power
2.4.1 Grid Connected Solar plus Storage
The Hub routes power from the main electrical panel to the backup panel via an internal transfer switch. The
EMC inside the Hub commands the battery system to charge or discharge the battery as demanded by the
energy management algorithm, using CT measurement of the loads and PV to calculate battery charge/
discharge values. In a self-consumption algorithm, for example, the EMC calculates the difference in total load
vs. solar PV, and routes the balance of power to/from the battery as needed. When the battery is full, PV power
bypasses the battery to grid/loads. When the battery is at minimum reserve, all home loads are supplied
entirely by the grid.
Note: The Hub is equipped with an internal automatic bypass switch which provides uninterrupted service
to the backup electrical panel when the ESS is either not powered (installed but pending permission to
operate) or out of service.
2.4.2 Backup Solar plus Storage
During a grid outage, the Hub islands the battery system and backup electrical panel off the grid. In this mode,
the EMC is in a monitoring state, with most control handed over to the ESS. The ESS curtails PV when the battery
is either full or exceeds the charge limit of the battery. On low SOC, the battery system goes into a standby
state until either the solar resource or the grid returns.
IMPORTANT! Shutting off the ESS circuit breaker at the main electrical panel will place the ESS into
backup mode and continue to energize the backup panel.
Solar
Inverter
Backup
Panel
Home
Internet
Service
Power Center™
Core LFP
(ESS)
Figure 2: Power Center™ Core Hub and Power Center™ Core LFP storage plus solar.
Power Center™
Core Hub
(Hub)
Offline during outage
100A
Main
Panel
4
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