Installation Guide

Planning
10 900-0144-01-01 Rev B
Maintenance Bypass Switching
Inverter systems are often equipped with AC maintenance bypass switches or interlocks. If the
inverter system ever needs to be shut down or removed, the AC sources and loads must be
disconnected. A bypass device allows the AC source to deliver power directly to the loads, bypassing
the inverter. This can minimize disruption to the system and avoids the need for extensive rewiring.
Figure 4 Bypass Switching
The GS Load Center (GSLC) can be equipped with bypass circuit breakers for this purpose. However, if
multiple Radian inverters are stacked in a single system, then the GSLC bypass kits should not be used.
The bypass function must be simultaneous for all inverters. The GSLC bypass kits operate
independently, not simultaneously.
Both manual and automatic double-throw bypass switches are commonly available in a range of sizes
and options. These are highly recommended for systems with more than a single inverter.
WARNING: Shock Hazard or Equipment Damage
Using independent bypass devices on multiple inverters can result in power being routed to
inappropriate places. This could create an electric shock hazard or damage the equipment.
Figure 5 Bypass Switching for Multiple Inverters
AC Source
AC Loads
GSLC Bypass
Inoperative
Radian
Inverter
Input Wiring Output Wiring
AC Source
AC Loads
Output Wiring
Inactive Radian Inverters
GSLC Bypass Devices
(not to be used)
External Bypass Device
Input Wiring