Duracell D-HUB - Special Tools & Hardware; Functional Overview; Grid Connected Solar plus Storage

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1.4 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.
•
1.5 Functional Overview
The
DURACELL HUB is equipped to support an AC coupled solar plus storage installation with backup power to a
dedicated backup electrical panel. The DURACELL HUB is a power distribution center for the ESS, routing all AC power
between the main and backup electrical panels. In the event of a grid outage, the DURACELL HUB will be energized
by the ESS, which will island off the main electrical panel. As shown below, the PV inverter’s AC output is connected
to the backup panel to support solar charging of the battery during a grid outage.
Figure 2: DURACELL HUB with DURACELL POWER CENTER 5KW.
1.5.1 Grid Connected Solar plus
Storage
The DURACELL HUB routes power from the main
electrical panel to the backup panel through the ESS
Grid/Load transfer circuit when the grid is live and
the battery system is in service (normal operation).
The EMC commands the battery system to charge or
discharge the battery as demanded by the energy
management algorithm. 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. The following diagram
outlines the power flow possibilities while grid
connected.
Note: The DURACELL 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.
PV
In
verter
PV panels
Grid
Load
power
Home
In
ternet
Service
CT
Main
Pa
nel
Backup
Pa
nel
Home loads
Home loads
to grid
PV
In
verter
PV panels
Grid
Load
Main
Pa
nel
Backup
Pa
nel
H
ome
loads
Home loads
Figure
3
: Grid connected solar plus storage.
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