Brochure

Photo courtesy of DOE/NREL and Steven Strong.
Battery Equalizers
12 Volt DC Power from Your 24 Volt DC System
With Vanner VoltMaster battery equalizers, you can have an abundance of 12 volt DC power
from your 24 volt battery system. Our equalizers allow operation of more reliable and less
costly 12 volt lighting and equipment on 24 volt electrical systems, saving you time and
money.
Extend the Life of Your Batteries
With Vanner VoltMaster battery equalizers, the voltage between each 12 volt battery is balanced in a 24 volt series connected battery array.
This arrangement equalizes the 24 volt battery system and avoids the over/under charge problems associated with other approaches to
providing 12 volts of power.
A Simple, More Reliable 24/12 Volt System
With Vanner VoltMaster battery equalizers, you can avoid the reliability problems associated with complicated and space consuming dual
alternators on vehicles, or multiple battery chargers on renewable energy systems.
Sizes for Any Application Need
Whether you need just 10 amps to operate a two-way radio or 200 amps to support a fully loaded tour bus, Vanner has the right size
equalizer to meet your application needs. Please see the back of this brochure for specifications.
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Experience the Power.
With the Vanner VoltMaster battery equalizer, you can run 12 volt loads
from your 24 volt battery system. Perfect for transit buses,
private coaches, tour & charter buses, heavy trucks, off-highway
equipment and alternative energy applications!
VoltMaster
VoltMaster Equalizer Operation
In many 24 volt electrical systems, it is desirable to tap
into the battery system to obtain power for 12 volt loads.
This method, while seemingly simple, causes a charge
imbalance resulting in Battery B (see diagram) being
overcharged, and possibly boiling, while Battery A
discharges.
To solve this application problem, the Vanner VoltMaster
battery equalizer is connected to the battery system at
the +24, +12 and ground points. The battery equalizer
maintains the voltage balance and charge acceptance
rate of each battery to within 0.1 volts under light loads
and within 0.5 volts at full loads. When the voltage of
Battery A is higher than that of Battery B, the battery
equalizer is in standby mode - meaning it is not
transferring power from its 24 volt input to its 12 volt
+24V
VANNER
Battery
Equalizer
+12V
GND
12V
Battery B
-
+
+
-
12V
Battery A
+12V
+12 Volt
Loads
+24 Volt
Loads
+24V
24V
ALT.
+
_
Note-Battery Banks A and B should
have the same amp-hour capacity.
F2
F1
output. When a 12 volt load is present, and Battery A’s voltage decreases to just below the
voltage of Battery B, the battery equalizer activates and transfers sufficient current from Battery B
to Battery A, satisfying the load and maintaining an equal voltage and charge in both batteries.
Know What Your Battery System Is Doing
With Vanner Electrical System Monitors, you can monitor a number of critical functions on a
24/12 dual voltage system. These monitors indicate high or low battery voltage, battery voltage
imbalance, alternator failure, or overloading of the 12 volt DC power.