OutBack Power Owner's Manual

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Installation

900-0209-01-00 Rev B

Ground Fault Detection and Interruption (GFDI)

If a ground-fault event occurs, the controller’s GFDI fuse will open. The FLEXmax 100 GFDI circuit

detects continuity across the fuse. Lack of continuity will cause the charge controller to shut down. If the

fuse is not initially installed, the controller will be unable to operate. In either case the LED indicators and

the system display will show GFDI Fault. (See pages 30 and 38.)

If multiple controllers are used on a common system, all but one fuse must be removed. The other

controllers will detect the continuity of the remaining fuse. All units will then respond equally to a ground

fault. Figure 7 shows how the fuse is removed or replaced.

IMPORTANT:



Removing the fuse from all controllers (or failing to install it) will prevent the controllers

from functioning.



Using multiple fuses will keep the FLEXmax 100 GFDI protection from working as

specified. It will also establish multiple ground bonds, potentially leading to other error

conditions. This will result in noncompliance with NEC or other codes.



Removing the ground bonding wire from all controllers will defeat the GFDI function.

This is a requirement in positive-ground systems. See the Ground Bonding section.

Figure 7 GFDI Fuse

External GFDI

IMPORT

ANT:

An external ground fault device must also contain the means for PV disconnection.

This function is built into OutBack GFDI products.

If alternate PV system grounding configurations or GFDI methods are required, remove the ground

bonding jumper wire from all FLEXmax 100 controllers. (See Figure 6.) Do not remove the GFDI fuses

from any controllers. Once the bonding wire has been removed, the external ground fault device can be

installed according to its own instructions.

1. To remove the fuse holder A, simply

grip it tightly by the top handle an

d pull

ward. The fuse and holder w

ill

unsnap from th

e board.

2. To open the fuse holder, push on the

o halves of the

top handle in

opposite directions as show

n in B

The holder

will o

pen on a hinge.

3. The fuse C can be

easily removed a

replaced as needed.

Replace

with a fu

se of

the same t

ype.

4. Replace the fuse holder by following these instructions in reverse.

Hinge