Installation Guide

Over-current Protection
WARNING
HAZARD OF ELECTRIC SHOCK, ENERGY, AND FIRE
Over-current protection must be provided, external to the unit, to protect the battery wiring.
External disconnecting means must also be provided for both the PV and battery circuits.
Consult applicable electrical codes to establish the correct fuse or circuit breaker ratings
and for required locations of protection and disconnecting means.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
Battery Circuit
The DC-rated fuse or circuit breaker between the battery and the charge controller must
be rated—at minimum—100 A for Conext MPPT 80 600 and 125 A for Conext MPPT 100
600, and must not exceed the allowable over-current protection rating for the size of wire
being used, in accordance with applicable electrical codes.
If a fuse is used for over-current protection, a disconnect switch must also be provided
between the fuse and the source of supply (the battery). If a circuit breaker is used, it will
serve both purposes of disconnection and overcurrent protection.
PV Circuit
DANGER
HAZARD OF ELECTRIC SHOCK
The PV array will produce a hazardous voltage with even a small amount of light.
Appropriate measures must be taken to prevent electric shock.
Failure to follow these instructions will result in death or serious injury.
WARNING
HAZARD OF ELECTRIC SHOCK, ENERGY, AND FIRE
PV wiring must be done by qualified personnel and in accordance with local electrical
codes.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
A properly rated PV disconnect switch is mandatory between the PV array and the
charge controller, and it must be rated for 600 VDC and have a sufficient current rating for
your specific installation.
If the PV array is configured in just one or two strings, then a single 600V disconnect
switch may be used. If the short circuit current rating of the solar array does not exceed
24A under Standard Test Conditions, then the switch may be rated for 30A. If a larger
Installation Conext MPPT 80 and MPPT 100 Installation Guide
990-91319 This document is for use by qualified personnel 32