Installation Manual and Specifications

Wiring
900-0123-01-01 Rev A 47
Bypass Switches
Inverter systems are often equipped with maintenance bypass switches or interlocks. If the
inverter system ever needs to be shut down or removed, its AC sources and loads must be
disconnected. A bypass device allows the AC source to “bypass” the inverter and deliver power
directly to the loads. This can minimize disruption to the system and it avoids the need for
extensive rewiring.
WARNING: Shock
Hazard or Equipment Damage
 Bypassing multiple sources will usually connect the sources to each
other, which may damage one or both sources. It can otherwise result
in power being routed to inappropriate places.
 The bypass assembly does not disconnect the inverter’s AC input.
Even with the inverter bypassed, any AC input source may be a
shock hazard unless disconnected.
In Figure 39, when Switch 1 is on (normal operation), the inverter’s output sends power to the
loads. Switch 2 is off, preventing the inverter from sending power back to the AC source
(backfeeding).
When Switch 2 is on (bypass operation), the AC source sends power directly to the loads.
Switch 1 is off, removing the inverter’s output from the loads. This also prevents the AC source
from backfeeding the inverter. With the inverter removed from the circuit, maintenance can be
performed as necessary.
Figure 39 Bypass Switches
The GSLC can be ordered with bypass circuit breakers for this purpose, or it has a bypass
option (the GS-IOB-120/240VAC or GS-IOB-230VAC) which can be installed.
Figure 40 OutBack Bypass (split-phase)
AC Loads
Switch 1
Switch 2
Inverter Out
p
ut
B
yp
ass AC Source
Switch 1 and Switch 2 are prevented
from being on at the same time by the
Mechanical Interlock. Although both
switches can be off, only one can be on.
In OutBack bypass assemblies, circuit
breakers are used instead of standard
switches.
The inverter may use an
AC source which powers
the inverter’s output.
The bypass assembly
does not disconnect the
inverter’s input.
AC
AC Loads
GSLC
Disconnected
Radian
Inverte
r
Input Output Wiring