OutBack Power Owner's Manual

Installation
14 900-0209-01-00 Rev B
The negative jumper position also completes a connection to the internal ground fault detection and
interruption (GFDI) circuit through the GFDI fuse. The jumper is removed if an external GFDI device is
used. (See the GFDI section on page 15.)
Figure 6 Bonding Jumper
Positive-Ground Systems
The FLEXmax 100 has several critical requirements when used in a positive-ground system.

The internal GFDI function cannot be used. However, make certain to leave the GFDI fuse in pl
ace.

Ensure neither PV conductor is grounded. The battery conductor is the only item to be grounded.
Take these additional steps.

Remove the bonding jumper wire (item
A
in Figur
e 6).

Establish an external positive-to-ground bond. The controller does not provide this bond.
Several other requirements must be met to maintain NEC compliance.

Install a dual-pole PV input circuit breaker to protect both the positive and negative condu
ctors.

Install external GFDI protection. (See the GFDI section on pag
e 15.)
Page 22 depicts a positive-ground system. See page 70 for requirements when networking other devices
on positive-grounded systems.
IMPORTANT:
Make certain the bonding jumper is removed from all controllers in a positive-ground system.
Leaving the jumper in place will cause the GFDI fuse to open. The controller will not operate
and will display the symptoms of a ground fault shutdown.
A
Battery –
Ground