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Operation
When the 2815M charger senses a drop in battery voltage, it
automatically increases its output to re-charge the battery. By
using a sophisticated 3 stage charging method, it recharges your
batteries in the fastest, healthiest way.
The amp meter on the front of the charger shows the total
combined charging
current during
stages, ("bulk" charging and
"absorption"
low battery approaches full charge, the charger reduces its output
to a "float" charging rate, indicated by the green LED light. This
low float voltage gently "tops off' your batteries, then keeps them
fully charged and ready for use without overcharging.
The total 15 amp output of this charger is divided between both
ofthe batteries connected to it, however the charge being applied
to each battery is individually regulated.
When using the 281 SM to charge a single battery, a jumper wire,
(not included),
be connected between the two DC positive
must
(+) outputs ofthe charger. (See page 10.)
The Guest ChargePro 281 SM battery charger is fully automatic,
requires no maintenance, and can be left unattended indefinitely.
However, the electrolyte (battery acid) in lead-acid batteries can
gradually evaporate, particularly in warm climates. Check your
batteries once a month as a part ofyour maintenance routine.
Overload Protection
Ifan electrical overload(excessive demand) occurs in the DC system
connected to this charger, it will reduce its output voltage to a safe
level. In the event of a dead short, the charger's output voltage will
effectively be zero volts.
Once the overload or short is removed, the 281 SM will automatically
resume normal operation.
-3-
the first and second charging
charging). When the
Checklist for required tools and mate rials
)(
and
Electric drill with 1/4"
Wire cutting and crimping tools
1/4" slotted screwdriver
5/16" and 3/8" socket wrenches or nut driven
2
Portable DC volt meter
Safety glasses, work gloves, and long sleeved shirt
Additional materials
4
#10 SS hex head or round head machine bolt'
(Bolt length
mounting surface thickness ph s 1")
=
4
each #10 SS flat washers, lock washers and hex nuts.
7" cable ties w/mounting holes (cx Beckson L-7M1-I)
20
pan head self-tapping screws (for
# 8 x 3/4" SS
20
fastening cable ties to mounting surface).
AC wiring
amp AC circuit breaker or fuse (if one is rot already
5
1
installed and available in your Main AC panel)
ring terminals (to attach the AC input wires to the
#8
6
charger and to the main AC panel).
3 conductor, 14 gauge Marine UL listed AC cable to
as
bring powerfrom your AC Main panel to the charger.
~i
DC wiring
Tinned, stranded copper wire to connect the
DC outputs to your batteries. (Red wire for positive (+)
as
connections
and black wire for ne~ative
req.
connections).
Use the table "DC wire size" on page 8 to determine
the correct diameter wire to use
installation.
4
#10 ring terminals to attach DC output wires to
charger.
3
5/16"
ring terminals (for connecting the 1)C output
wires to the batteries' positive (+) terminal pcsts).
ring terminal to
engine's negative
the
1
fit
-4-
Tools
1/16" drill bits
charger's
(-)
ror your
ground post
(-)
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