AUXILIARY BATTERY CHARGER: The M20+ / M25 features a fixed voltage (13.8 volt) .1 amp
output trickle charger to keep engine/generator start batteries fully charged.
LED BATTERY GAUGE: Four LED’s form a easy to use Battery gauge. When all the LED’S are lit the
Battery is fully charged. As the Battery voltage drops the first Green LED will go off. When more power is
used from the battery the second Green LED will go off. As the battery discharges the Yellow LED will go
off. When only the RED LED is lit the battery is nearly empty. When all the LED’S are off the battery is
discharged. For best Battery life do not completely discharge the Battery. See specifications for LED turn
off voltages. The LED Battery gauge may be turned off by switching position 4 on SW1 to the left. See
wiring diagram for details.
MAINTENANCE: The M20+ / M25 requires little maintenance. Clean the M20+ / M25 meter assembly
and power module with a damp cloth. Inspect all wire connections. Tighten all connections as required.
Recalibrate float voltage if required. Visually inspect the entire PV system for damage. Keep the PV array
clean and properly aligned to the sun. Keep batteries clean. Follow Battery manufactures maintenance
recommendations.
WARRANTY: BZ Products, INC. Model M20+ / M25 is warranted to be free of defects in material and
workmanship for five years from the date of purchase. Failure to provide correct installation, operation or
care for this product, in accordance with the instruction manual, will void the warranty. Product liability
shall be limited to repair or replacement, at the discretion of the manufacture. The manufacture is not
responsible for the labor or other charges necessitated by the removal, transportation, or reinstallation of
any defective product. Warranty does not cover damage due to, mishandling, abusive conditions, lightning,
or exposure to weather. No specific claim of merchantability shall be assumed or implied beyond what is
printed in this manual. No liability shall exist from circumstances arising from the inability to use this
product, or it’s inappropriateness for any specific purpose. In all cases, it shall be the responsibility of the
customer to insure a safe installation in compliance with local, state and national electrical codes.
RETURN PROCEDURE: To return a model M20+ / M25 for repair provide the following information.
Name/Company name, return address, daytime phone number, description of failure, copy of sales receipt.
Return shipping charges collected via COD.
BZ PRODUCTS, INC.
7914 GRAVOIS ROAD St. LOUIS MO 63123 USA (314) 644-2490
SPECIFICATIONS: Note for 24 volt systems Battery and LED meter voltages double.
PV charge current 25 amps continuous Digital Meter .5” LCD display
Surge current 40 amps 10 min. DC volts range 0-99.9 volts ±.5%
Array voltage open circuit 60 volts DC amps range 0-99.9 amps ±.75%
Surge voltage 75 volts Temp. comp. -18mV/°C nominal
Min Battery voltage 5 volts Voltage drop <.6 volts @ 30 amps
Operating temp. -20 to + 50°C Storage temp. -30 to + 70°C
Float voltage range 12.5 to 15.5 volts Weight 2 pounds
Operating current .05 amps nominal Float regulation ± .05 volts nominal
Wire size # 2 max AWG Mounting # 6 screws
Battery size 100 AH minimum Reverse current .01 amps nominal
Wire access 1/2” conduit Float voltage 14.1 (28.2) volts
Lightning protection MOV 1000 watts Size (meter) 5 3/4” X 3 1/4”
Auxiliary Charger 13.8 volts .1 amp (fixed) Size (control) 6” X 7” X 1 1/2”
M25 meter cable 25’ Finish Black powder coat
LED battery gauge Red = 12.2 volts, Yellow = 12.7 volts, # 2 Green = 13.2 volts # 1 Green = 13.7 volts.
