OutBack Power Installation Manual

Installation
34 900-0123-01-00 Rev C
DC Devices
In addition to inverter or PV connections, other devices may be connected to the GSLC, such as DC
loads or sources. The wiring on these devices will vary with the application. In most cases the device
will have a separate circuit breaker which is mounted on the rail as shown on page 24. It will be wired
into the battery system using the existing bus bars or shunts. The number and location of these
connections will vary with the options or accessories installed.
PV and Charge Controller Wiring
When wiring the FLEXmax, FLEXmax Extreme, or another charge controller to the GSLC, a number of
elements are involved. These elements include the PV or RE source, the battery connections, the
disconnect circuit breaker, the PV ground-fault device, and the charge controller.
These instructions are written for a PV source which uses the OutBack FLEXmax (or FLEXmax Extreme)
charge controller and the GFDI. Other applications will be similar.
NOTE
: In GSLC models designated as “PV”, many of the connections below are already provided. The
only connections necessary are those for external wiring to the charge controller.
To make PV and charge controller connections:
1. Connect the PV positive wire to the GSLC’s PV positive (+) TBB (see Figure 31).
2. Connect the PV negative wire to the charge controller’s PV negative (–) terminal (see Figure 32).
3. Install a wire from the PV TBB to the PV disconnect circuit breaker (see Figure 31).
4. Install a wire from the PV disconnect to the charge controller’s PV positive (+) terminal.
5. Install a wire from the GSLC’s DC positive (+) cable plate to one pole of the GFDI.
6. Install a wire from the GFDI to the charge controller’s positive (+) battery terminal.
7. Install a wire from the charge controller’s negative (–) battery terminal to the GSLC’s negative TBB.
If the FLEXnet DC or another battery monitor is in use, this wire should connect to the shunt which
monitors that charge controller.
8. Repeat all steps for a second charge controller, if necessary.
NOTES:

Each TBB accepts conductors from 1/0 AWG (70 mm
2
) to #14 AWG (2.5 mm
2
) in size. See Table 2 on page 29
for required torque values.

For other GSLC required torque values (such as shunts and circuit breakers), see Table 1 on page 19.

For torque values, wire sizes, and other information concerning the FLEXmax charge controller, see the
FLEXmax Series Charge Controllers Owner’s Manual.

For more information on specific wiring of the GFDI, see the GFDI manual.

A diagram that shows typical wiring for a PV system, including the FLEXnet DC, GFDI, and other elements of
the system, is shown on page 49.

A fully-assembled GSLC diagram with the elements mentioned above (as well as the AC system) is shown on
page 49.