Installation Guide

Table Of Contents

The charge controller’s

On/Charging (green)

LED is flashing.

The charge controller is outputting charge

current.

No problem. This is intended operation. See

“Viewing Status Information on the Solar Charge

Controller” in the Conext MPPT 80 and MPPT 100

Owner's Guide for LED status information.

Replacing the Ground Fault Protection Fuse

DANGER

HAZARD OF ELECTRIC SHOCK

If a ground fault is indicated, normally grounded PV conductors could be ungrounded and

energized. Before working on any portion of the array or wiring, make sure that portion of

the array is de-energized by blanketing, use of disconnects, or other safe working

procedures and by testing for voltage before beginning work.

Failure to follow these instructions will result in death or serious injury.

The ground fault protection fuse blows when a significant leakage current flows between

the PV array and earth ground or when the system has been installed with deficient

wiring. Before replacing the fuse, it is important to have qualified service personnel, such

as a certified electrician or technician, determine the cause of the ground fault and effect

repair.

To replace the ground fault protection fuse:

1. Make sure the PV and battery disconnect switches are open and the charge controller

is de-energized.

2. Remove the wiring compartment cover, as described in Wiring on page 31. The

ground fault protection fuse is located behind the wiring terminals.

3. Remove the blown fuse and replace it with a new AC/DC midget cartridge, DC-rated

600 VDC, 1 A (Littelfuse® KLKD 1 or equivalent). Be careful not to damage the fuse

clips, circuit board, and surrounding components.

4. Replace the wiring compartment cover.

5. Clear the fault and reset the system by removing and then reapplying both PV and

battery power.

Ground Faults in a Normally Ungrounded Array