OPERATION:
Operation of the BZ 7 is fully automatic. When the battery voltage is lower than the float
voltage, full PV charge current is applied to the battery. When the battery voltage equals the float voltage
the BZ 7’s PWM circuitry activates and maintains the float voltage. During PWM operation battery charge
current will diminish.
The PV array voltage will vary greatly during normal operation.
DURING OPERATION THE BZ 7 MAY FEEL WARM.
THE BZ 7 FLOAT VOLTAGE IS PRE-CALIBRATED.
NO ADJUSTMENT IS NEEDED WHEN USING WET LEAD ACID BATTERIES.
FLOAT VOLTAGE CALIBRATION: (
Twelve volt nominal system. Refer to specifications for float
voltage set points for 24, 36 and 48 volt systems). Battery float voltage is the voltage that the BZ 7 allows
the battery to charge up to and not exceeded.
Battery float voltage is pre-calibrated to 14. 1 volts.
In most installations the float voltage needs no adjustment.
Check battery manufactures
recommendations for proper charge voltage.
Do not attempt to adjust the float voltage on cloudy or overcast days. To properly adjust the battery float
voltage a Digital Volt Meter is required. Locate the float voltage adjustment control, refer to the wiring
diagram. Connect the Digital Volt Meter to the battery. A 1/8” wide screw driver is needed to adjust the
float voltage. Adjust the float voltage control in small increments, turning the float voltage control clock
wise to increases the float voltage and counter clockwise to lower the float voltage, until the desired float
voltage is displayed on the Digital Volt Meter. The YELLOW Float LED will light when the float voltage
is reached. Disconnect the Digital Volt Meter from the battery.
MAINTENANCE:
The BZ 7 requires little maintenance. Periodically clean the BZ 7 with a damp cloth.
Inspect all wire and wire connections. Tighten and clean 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. Keep batteries clean. Follow battery manufactures maintenance recommendations.
WARRANTY:
BZ Products, INC. Model BZ 7 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 this 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 BZ 7 for repair provide the following information.
Name/Company name, return address, daytime phone number, description of failure, copy of sales receipt.
Include $7.00 for return postage. Return to BZ Products, INC.
BZ PRODUCTS, INC.
7614 MARION Ct. St. LOUIS MO 63143 USA (314) 644-2490 [email protected]
