Safety Instructions PowerCharger English
Mastervolt, Inc. 7380 Cocal Cola Drive, Suite 112-113 Hanover, MD 21076 USA Tel.: 443-459-5370 Email: infoNA@mastervolt.com Copyright © Mastervolt v1.0 091125EN
6
INSTALLATION
Do not reverse polarity when connecting the PowerCharger as it may result in severe damage to the charger
and the batteries! DC output fuses or circuit breakers should be rated a minimum 120% to maximum 150%
of the charger’s rated output. AC input circuit breakers should be the same size (or as close as possible) to
the AC input amperage of the charger. ABYC standards require a fuse or circuit breaker to be located within
72 inches of the battery if the cable length is enclosed in conduit. Otherwise, a fuse or circuit breaker must
be placed within 7 inches of the battery.
5
WARNING REGARDING LIFE SUPPORT APPLICATIONS
Do not use the PowerCharger for applications in any medical equipment intended for use as a component of
any life support system!
4
WARNINGS REGARDING THE USE OF BATTERIES
1 Someone should be within range of your voice or close enough to come to your aid when you work near
a lead-acid battery.
2 Have plenty of fresh water and soap nearby in case battery acid contacts skin, clothing, or eyes.
3 Wear complete eye protection and clothing protection. Avoid touching eyes while working near battery.
4 If battery acid contacts skin or clothing, wash immediately with soap and water. If acid enters eye,
immediately flood eye with running cold water for at least 10 minutes and get medical attention
immediately.
5 NEVER smoke or allow a spark or flame in vicinity of battery or engine.
6 Do not short circuit batteries, as this may result in explosion and fire hazard! Be extra cautious to reduce
risk of dropping a metal tool onto battery. It might spark or short-circuit battery or other electrical part that
may cause explosion.
7 Remove personal metal items such as rings, bracelets, necklaces, and watches when working with a
lead-acid battery. A lead-acid battery can produce a short circuit current high enough to weld a ring or the
like to metal, causing a severe burn.
8 Do not use PowerCharger for charging dry-cell batteries that are commonly used with home appliances.
These batteries may burst and cause injury to persons and damage to property.
9 NEVER charge a frozen battery.
10 Excessive battery discharge and/or high charging voltages can cause serious damage to batteries. Do
not exceed the recommended limits of discharge level of your batteries.
11 If it is necessary to remove a battery, always remove grounded terminal from battery first. Make sure all
accessories are off, so as not to cause an arc.
12 Be sure that the area around battery is well ventilated while battery is being charged. Refer to the
recommendations of the battery manufacturer.
13 Batteries are heavy! It may become a projectile if it is involved in an accident! Ensure adequate and
secure mounting and always use suitable handling equipment for transportation.
See user’s manual for dip-switch 3 and 4 settings.
dip-switch 1 dip-switch 2
Lead Acid/ wet 3step+ charging Off
AGM, Gel, Spiral battery Constant voltage charging
(Float = 13.25/26.5V)
On
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POWERCHARGER 12/40-3 SETTINGS
The Powercharger 12/40-3 is factory set to charge lead acid/ wet batteries
Adjust dip-switch setting when charging Gel or AGM batteries. Do not charge
multiple batteries with different chemistry.
Do not use with dry cell type batteries such as NiCd or NiMH.
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