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Series Operation
7–4 445-0089-01-01
AC Input
The AC input (shorepower) supply to the system must be a 120/240Vac split-
phase system that provides two line conductors (referred to as L1 and L2), a
neutral, and ground. Each PROsine requires a line, neutral, and ground run to it,
so 2-conductor-plus-ground cable is needed with a 30A max circuit breaker
installed in the line conductor. Typically these AC input cables originate in a
distribution panel, providing a main disconnect and the separate 30A circuit
breaker required for the AC input of each PROsine. That distribution panel,
referred to as the “source panel,” also provides neutral and ground busses,
allowing for easy connection of the neutral and ground conductors in the cables.
AC Output
The AC output of each PROsine requires a separate 2-conductor-plus-ground
cable (line, neutral, and ground) run from the PROsine to a 120/240Vac split-
phase sub-panel for the loads. The sub-panel, referred to as the “load panel,” must
be equipped with a double-pole circuit breaker rated 30A max, 240Vac for the two
line conductors (L1 and L2), and neutral and ground busses for the neutral and
ground conductors from each unit. The load panel then provides circuit breakers
for the 120Vac and 240Vac branch circuits powering the loads. Since the neutral-
to-ground bonding is provided upstream (by one of the PROsines in Invert mode,
and by the utility otherwise) this load panel must not bond the neutral to ground.
Most panels have a removable screw that allows the neutral to be unbonded.
Battery Disconnect and Over-Current Protection Requirements
As with a single PROsine system, batteries must have a fuse and disconnect or a
DC-rated circuit breaker in the positive side, matched to the cable size. The
recommendations about wire sizes, over-current protection, disconnection means,
and other important details discussed in Chapter 3, “Installation” apply here.
Refer to “Step 1: Designing the Installation” on page 3–4 for details. Each
PROsine must be wired to the battery separately (whether a single bank or two
banks are used).
Series Sync Connection
The SYNC connectors on the PROsines are connected by a series sync cable. This
cable is a standard 4-conductor telephone cable of ten feet or less and may be
purchased from most electronic retailers.
Important:
The series sync cable is an option and is not supplied with the PROsine
PROsine. Contact Xantrex or your distributor for this part.