BZ PRODUCTS M20+ Installation Manual

MODELS M20+ and M25 PWM CHARGE CONTROLER
CAUTION! READ ALL INSTRUCTIONS PRIOR TO
INSTALLING OR USING THIS EQUIPMENT
Refer service to qualified service personal. Incorrect installation may result in risk of fire. Remove all
sources of electrical power, photovoltaic and Battery before servicing this equipment. Never charge a
frozen Battery. Warning! Batteries produce explosive gasses. Install batteries in a well ventilated
area. Follow Battery manufacture maintenance and charging recommendations. Install properly
rated fuses PV and Battery circuits. Do not connect to generators or alternators.
CONNECTING BATTERY REVERSE POLARITY TO THE BATTERY OR PV WIRE
CONNECTIONS WILL DAMAGE THE CONTROLLER AND VOID THE WARRANTY.
DESCRIPTION: The M20+ / M25 PWM charge controller is a dual voltage (12 and 24 volt), high
efficiency shunt type PV charge controller capable 25 amps charge current. The remote digital meter
displays Battery volts and PV charge current in amps. A four LED Battery gauge indicates relative Battery
charge at a glance. The meter assembly may be mounted up to 25' from the M25 control module. Four
large wire connectors accept up to # 2 wire. A low loss Schotkey diode prevents night time Battery
discharge. Float voltage is easily adjusted to suit any Battery chemistry. An internal MOV provides
lightning protection. Battery temperature compensation is standard. An auxiliary 13.7 volt (fixed voltage)
100 ma trickle charger is provided to charge engine or generator start batteries.
SYSTEM LAYOUT: Plan your installation. Install the M20+ / M25 control unit near the Battery bank.
Avoid installing the controller in wet, damp or small confined locations. Use short direct wiring. Install the
controller in accordance with state, local and national electrical codes. Securely fasten the controller to a
wall or other suitable structure. Provide support for all wiring. Place the Battery temperature sensor near
the batteries. Install properly rated fuses.
Install the M25 meter in any convenient location. A twenty five foot cable connects the M25 meter to the
M25 control unit. The cable connectors are keyed so that they connect properly. Insert the connector in the
M25 control unit. Run the interconnect cable from M25 control unit to the M25 meter and connect to the
meter connector. Use the M25 meter template to mark the cut out for the meter. A minimum of two inches
clearance is required behind the M25 meter. Do not pull on the meter cable connectors. Four black screws
are provided to mount the M25 meter.
WIRING: Use high quality stranded wire. Solid wire is not recommended. The M20+ / M25 Battery and
PV wire connectors will accept up to # 2 wire. The auxiliary Battery charger connector will accept up to #
14 stranded wire. Protect wire from damage. Clearly labeling all wiring with permanent wire markers will
simplify installation and help prevent wiring errors. Permanent wire labels are available from most
electrical parts suppliers. Route wiring as directly as possible to the PV panels and Batteries. Take care to
follow the wiring diagram exactly. Plastic insolating bushings are provided to protect the wiring from
chafing. Install properly rated fuses in the Battery, PV and Auxiliary Battery circuits as indicated.
BZ PRODUCTS, INC.
INSTALLATION MANUAL
VERSION 2.0

SAFETY INSTRUCTIONS: