Sld - Ac Coupled Pv System With Back-Up Power Operation - Duracell D-HUB Installation Manual

2.3 SLD - AC Coupled PV System with Back-up Power Operation

The single line diagram shown below is a representation of a typical installation configured for utility interactive and
back-up power operation, with AC coupled PV connected to a backup panel. This drawing is a guideline only and is
not a substitute for a code compliant installation. All components required for a code compliant installation are the
responsibility of the licensed installer, including any additional circuit protection requirements not shown here.
Figure 10: Sample single line diagram of an AC coupled solar plus storage installation (base model shown).
NOTES
1 - The backup power bus must be electrically isolated from the main electrical bus. Do not
tap the neutral wires of the main and backup buses. Refer to the installation manual for
wiring details. Load circuits are shown for demonstration. Maximum number of circuits
determined by sub-panel rating. Loads connected to circuits must not exceed nominal
power ratings (continuous/surge) of the inverter.
2 – The battery system must be earth bonded to the building ground to meet lightning
protection requirements.
3 – The battery system load and grid ports are independently controlled circuits. Should the
electrical code require additional "line-of-sight" or dedicated disconnects, a separate
disconnect must be used for each of the grid and load ports. The disconnects and/or circuit
breakers must operate independently of each other, and rated for the branch circuit.
4 - CTs are equipped with 8 ft pigtails. Twisted pair extensions can be run up to 30 ft. CT
extensions should not be required if the DURACELL HUB is within 4 ft of the PCS.
5 – Ethernet connection between router and EMC is optional. EMC can communicate using
Wi-fi or cellular.
6 – PV cannot exceed 5kW AC output in backup mode. PV systems larger than 5kW AC must
have a self-curtailment mechanism (software or hardware) to ensure limit is within the 5kW
AC rating. If curtailment means are not available, the balance of PV (if applicable) must
be routed directly to the main panel.
7. For electrical services rated less than 200A, the ESS system must be line side tapped as
shown in figure 11.
Disclaimer:
Manufacturer supplied components represented here are limited to the PCS/Battery, DURACELL HUB, and CTs for PV, battery, and
mains. All other materials and components represented are customer supplied. CEC/NEC electrical code compliance is the
responsibility of the designer and/or electrical permit holder.
HUB ESS
to
HUB
Figure 11: 100 Amp main panel line
side tap to the DURACELL HUB.
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