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The WP-20 is a rugged, waterproof and sophisiticated three state lead-acid battery charger. With a wide operating
temperature range (-10 ºC to 55 ºC) and UL/CSA1236 certification, this product is especially suited for emergency vehicle
and severe environments.
Charging operation, LEDs, and relay control signals are generated by an embedded microcontroller that contains soft-
ware. The charger precisely controls charging voltage and current to insure a complete recharge every time. The charger
may be left connected indefinitely to the battery, maintaining full charge at all times.
1) INSTALLATION
1-1) Location
• Do not mount directly over or under a battery or onto a carpeted, upholstered or varnished surface.
• Install in an area where all charger electrical cords will avoid hot surfaces such as exhaust pipes and moving parts
such as fan wheels.
• Operating temperature is -10 ºC (-14 ºF) to 55 ºC (131 ºF). Storage temperature is -30 ºC (-22 ºF) to 80 ºC (176 ºF)
• Provide as much surrounding cooling clearance as possible. At a minimum, maintain an 8 inch clearance around the
perimeter and top side of the charger.
• Never mount in the vicinity of explosives, pressurized cans or other flammable material.
1-2) Mounting
• Wear safety goggles, gloves and a long sleeve shirt when drilling mounting holes near a battery.
• In most cases, #10 stainless steel mounting bolts with aircraft nuts or nylocks or #10 screws provide for solid mounting.
2) ELECTRICAL
2-1) DC Wire Connections
• The charger should be used only with a lead-acid type battery.
• DC wire connections to the battery should be made before plugging in the AC cord. Do not remove DC connections
while the AC cord is plugged in.
• When installing in the bilge and or battery compartment of boats, open hatches and operate bilge blowers if any for ten
minutes to remove any fumes and hydrogen gas. Be certain the area is ventilated for personal health and safety.
• Keep wire routing from the charger to the battery neat and secure by anchoring with cable tie to a solid surface every
few inches, not to exceed 18" intervals.
• As is true with any device connected to a battery, an in-line fuse added to the positive lead to the battery is required
(installer provided) and will provide further protection if the DC cord is somehow damaged.
• For a single 12 volt battery, connect the charger lead set to the battery as follows; the charger red lead is connected to
the battery positive terminal and the black charger lead is connected to negative terminal of the battery. When
charging two 6 volt batteries connected in series connect the red lead of the charger to the positive terminal of
battery #1. Connected the negative terminal of battery #1 to the positive terminal of battery #2. Connect the black
lead of the charger to the negative terminal of battery #2. All connections should be clean and tight. See installation
diagrams.
• When connecting two batteries in series it is imperative that the amount of discharge be equal for both batteries or
excessive battery voltage during charge will be occur resulting in an overvoltaged battery. This will cause dangerous
battery out gassing and destruction.
2-2) Electrical Characteristics
AC Input Voltage Range: 90 - 132 VAC
AC Input Current: 6A rms Maximum
Max. Charging Current: 22A (Fast Mode)
Charging Voltage (Absorption Mode): 14.1 VDC, 4 amps
Float Voltage (Float Mode): 13.5 VDC
170 Cherry Ave.,
West Sayville,
New York 11796
www.kussmaul.com
Pg. 1
Phone: 800-346-0857
Fax: 631-567-5826
E-Mail: sales@kussmaul.com
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