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OutBack
Inverter Stacking
How does the OutBack modular system work?
Several stacked configurations are possible. For
systems not requiring 240V output, two inverters may be stacked
in L1 mode to operate in parallel to power one leg at 120V. The
"slave" inverter will turn off if not needed. The X-240
transformer is not needed in this mode. This system is capable of
producing significant power on that one leg - see the manual for
breaker and wire sizing.
For systems requiring 240V split phase, the X-240
transformer is necessary. The slave inverter is programmed as an
"L2" slave, and will turn off when not needed. The X-240
has two main benefits: heavy loads are balanced between two inverters,
and loads on either leg may be powered by one inverter if power
needs are small, allowing one inverter to idle even if there are
loads on two legs. This configuration also allows easy use of a
240V generator. We are very enthusiastic about this configuration.
When charging from an AC source, both inverters
will be on.
OutBack has placed some very nice schematics for
the various configurations on their webite in the wiring
diagrams section. We recommend purchasing a prewired panel,
which of course we would be happy to help you with!
New OutBack "Half-Rack"
Uncovered "Full Rack"
Note the X-240 fits inside the PSAC or PSAC-2, and
also comes with a 2pole 25amp breaker, so the PSAC is highly recommended
as a clean way to install the X-240. This also provides a place
for input, output and bypass breakers.
What is a bypass breaker? It's simply a way to connect
an AC source (generator or grid) directly to loads in the event
of inverter or DC system failure. Normally this function is handled
by the transfer relays in the inverters; the bypass breaker
is not used during normal operation.
NOTE - For Grid-Interactive systems, at the present
time, the OutBack G series inverters may be stacked in classic,
series mode for 120/240. This does not require the X-240. Only (2)
G series inverters may be stacked at this time. Parallel stacking
is not yet supported for G series inverters.
POLICIES
All
items are new with full manufacturers warranties, unless otherwise
noted. CSE guarantees all items to be as advertised, subject to
typographic errors. Any item may be returned for a refund within
30 days. Returns require return authorization from CSE. Returns
may be subject to a 15% restocking fee. Shipping charges are not
refundable.
Any back-ordered items may be cancelled at any time before shipping
for full credit.
Colorado residents add 2.9% sales tax.
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