800.261.3602
Revised 07/18
Choosing a Mounting Location
Most trailer manufacturers have a recommended location that provides easy accessibility for
running wires from the charge controller to the batteries and solar panels mounted on the roof.
The SunExplorer III-35 should be mounted:
As close to the batteries as Feasibly possible, avoid long wire runs
>10 feet, longer runs have higher voltage drops when charging.
Where there is sufficient depth behind the controller (min. depth 1 1/4")
To allow for the battery and solar panel wires and ventilation.
Away from moisture and heat sources (sinks, shower, stoves etc.).
The controller needs to be protected from steam, water and spray cleaners that can get
behind the faceplate, causing damage to the unit.
Indoors away from doors and windows, protected from weather.
WARNINGS – IMPORTANT
This charge controller is designed for indoor use only and should never be exposed to moisture
(water or rain). It will damage the electronics.
Electricity can be very dangerous. Installation should be performed only by a licensed
electrician or qualified RV service technician.
When working around batteries, always wear protective eye wear and appropriate clothing,
observe all safety precautions of the battery manufacturer. When batteries are charging, they
produce hydrogen gas which is highly explosive. Avoid any sparks or open flame when
charging.
Always cover the solar panels with a thick cloth or blanket to block out ALL light before
connecting the panel wiring to the charge controller. Avoid accidental shorting of the wires
or terminals which could cause personal injury or damage to the unit or sparks causing a fire.
Disconnect all power sources before installation (utility power & batteries)
Observe correct polarity when installing. Reverse polarity of either the solar panel or battery
connections could cause damage to the controller.
Ensure all electrical connections are tight and secure. Torque hex screws to 16 inch
pounds, re-torque after ten days of operation to avoid any loose connections that can
cause sparks and/or excessive heat.
Do not exceed the SunExplorer III-35’s Maximum current (Amps) and PV voltage ratings, total
of 35 Amps (IMP) and 25.0VDC (VMP). See solar panels electrical ratings info tag found on the
back side of the solar panel.
Tools and Materials needed for Installation
Philips Screwdriver (for mounting bracket screws)
Torque Allen Wrench (for wire terminals)
Wire stripers or utility knife
Small hole saw or utility knife (for cutting opening for flush mounting) 7