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For one (1) year from the date of purchase, The Guest Co., Inc.
will, at its discretion, repair or replace for the original consumer,
free of charge, any part or parts found upon examination by Guest
Co., Inc., 48 Elm St., Meriden, Connecticut to be defective in
material or workmanship or both. Proof of purchase required. All
transportation charges under this warranty must be borne by the
THERE IS NO OTHER EXPRESSED WARRANTY. IMPLIED
WARRANTIES, INCLUDING THOSE OF MERCHANT-
ABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
ARE LIMITED TO ONE YEAR FROM THE DATE OF
PURCHASE. THIS IS THE EXCLUSIVE REMEDY AND
CONSEQUENTIAL DAMAGES ARE EXCLUDED WHERE
PERMITTED BY LAW.
If you, our customer, have any questions concerning Guest
products, parts or warranties, please contact our Service
Department Monday through Friday between 9:00 AM and 4:00
PM Eastern Time. (formerly 2615AM)
(203)-238-0550 BATTERY CHARGER
INSTALLATION AND OPERATION
The Guest Co. INSTRUCTIONS FOR
48 Elm St. Meriden, CT 06450 USA
A Valley Forge Company
I MODELS 281 5M11 15 AND 281 5M123D
READ THESE INSTRUCTIONS BEFORE
Writefor your free copy ofthe new GUEST catalog. INSTALLING AND USING THIS PRODUCT.
Keep these instructions for future reference
The Guest 2815M ChargePro is a solid-state "3-stage" battery
charger and is lightweight, silent and completely automatic. It can Total output current
produce a full 15 amps of 12 volt DC charging current while using maximum: 15 amps at 12 volts DC
much less AC current than other chargers. This revolutionary new "float" mode: 0.1 to 0.3 amps at 13.! volts DC
design can rapidly recharge and individually maintain 2 separate Output voltage:
battery banks at one time. If a DC short or overload occurs, the with 15 amp load: 12 volts DC minimum
charger will reduce its output voltage to a safe level, then finish ("float") voltage: 13.5 volts DC (+7- 0.1 volts DC)
automatically return to normal after the overload is removed. Its Input voltage 2815M/1 15:
- 90 to 140 volts/SO or (0 Hz AC
water resistant polycarbonate housing and urethane coated circuitry Input voltage 2615M/230:
- 190 to 240 volts/SO or 60 Hz AC
make it ideal for harsh environments. Every Guest 28l5M charger Max. AC draw at 115 volts: 3 amps
is tested under load before shipment to assure superior reliability. Housing dimensions 9"H x 7 7/8"W x 4"D
Application Diagram 1 Guest 2815M charging method
This battery charger is ideal for a wide variety of installations using
12 volt lead-acid or gel-cell batteries. Some of the most popular Time
battery configurations are:
· Two Group 24 batteries 0
· Two Group 27 batteries 0
V ~V~V~VV~ ~~VV~~VV V V V
· One Group 4D battery and one Group 24 battery 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 01 01 01 01 01
Installations using more or larger batteries are possible, but it may DC Amps
require a longer time to recharge the batteries in these installations. J RBuIk ~Absorbtion 0 Float
Longer recharging times can also result if there is equipment on
board that requires substantial amounts of DC current while at
dockside, such as: This device meets or exceeds FCC Part 15 Standards elating to
· a DC only refrigerator or ice maker RF interference. This device is not intended for use with
combination 12/24 volt battery systems.
· a DC only air conditioner or heater
a large number of 12 volt DC lights in use If your vessel does not already have an ABYC app' oved AC
dockside power system, The Guest Company strongly
Iwo different versions of the Guest 281 5M are available: recommends that you consult with a qualified marine ~1ectrician
· The model 2815M11 15 for 115 volt AC input, and before installing this device. Improper AC conne tions can
· The model 2815M1230 for 230 volts AC input. cause physical injury or damage to your vessel.
Both versions will function with either 50 Hz or 60 Hz AC inputs. -2-
Operation Checklist for required tools and mate rials
When the 2815M charger senses a drop in battery voltage, it )( Tools
automatically increases its output to re-charge the battery. By Electric drill with 1/4" and 1/16" drill bits
using a sophisticated 3 stage charging method, it recharges your Wire cutting and crimping tools
batteries in the fastest, healthiest way. 1/4" slotted screwdriver
2 5/16" and 3/8" socket wrenches or nut driven
The amp meter on the front of the charger shows the total
Portable DC volt meter
combined charging current during the first and second charging
Safety glasses, work gloves, and long sleeved shirt
stages, ("bulk" charging and "absorption" charging). When the
low battery approaches full charge, the charger reduces its output Additional materials
to a "float" charging rate, indicated by the green LED light. This 4 #10 SS hex head or round head machine bolt'
low float voltage gently "tops off' your batteries, then keeps them (Bolt length = mounting surface thickness ph s 1")
fully charged and ready for use without overcharging. 4 each #10 SS flat washers, lock washers and hex nuts.
20 7" cable ties w/mounting holes (cx Beckson L-7M1-I)
The total 15 amp output of this charger is divided between both # 8 x 3/4" SS pan head self-tapping screws (for
ofthe batteries connected to it, however the charge being applied fastening cable ties to mounting surface).
to each battery is individually regulated. AC wiring
When using the 281 SM to charge a single battery, a jumper wire, 1 5 amp AC circuit breaker or fuse (if one is rot already
(not included), must be connected between the two DC positive installed and available in your Main AC panel)
(+) outputs ofthe charger. (See page 10.) 6 #8 ring terminals (to attach the AC input wires to the
charger and to the main AC panel).
The Guest ChargePro 281 SM battery charger is fully automatic,
as 3 conductor, 14 gauge Marine UL listed AC cable to
requires no maintenance, and can be left unattended indefinitely. bring powerfrom your AC Main panel to the charger.
However, the electrolyte (battery acid) in lead-acid batteries can ~i
gradually evaporate, particularly in warm climates. Check your Tinned, stranded copper wire to connect the charger's
batteries once a month as a part ofyour maintenance routine.
as DC outputs to your batteries. (Red wire for positive (+)
req. connections and black wire for ne~ative (-)
Overload Protection Use the table "DC wire size" on page 8 to determine
Ifan electrical overload(excessive demand) occurs in the DC system the correct diameter wire to use ror your
connected to this charger, it will reduce its output voltage to a safe installation.
level. In the event of a dead short, the charger's output voltage will 4 #10 ring terminals to attach DC output wires to
effectively be zero volts. charger.
3 5/16" ring terminals (for connecting the 1)C output
Once the overload or short is removed, the 281 SM will automatically wires to the batteries' positive (+) terminal pcsts).
resume normal operation. 1 ring terminal to fit the engine's negative (-) ground post
Installation Preparing the mounting location
1. Hold the battery charger against the surface wh ~re you
are planning to mount it. (Be sure that you will bc able to
drill holes through this surface later without damage to
Before beginning this installation - wiring, tanks or other equipment.) Using a penc:1, mark
· Open engine hatches and operate bilge blowers for 10 the locations of the battery charger's four mounting holes
minutes to remove dangerous fumes and hydrogen gas. onto the mounting surface
· Disconnect all AC power sources. 2. Drill four 1/4" holes through the mounting surface at the
locations you marked with pencil.
· Disconnect negative battery cables from all batteries.
· Wear safety goggles, gloves and long sleeved shirt when Note: Do not mount the charger until ~~you have
made thefollowing electrical connections
drilling or while handling batteries.
Choosing a mounting location Electrical connections
1. Mount this charger in an upright position only, with the Installing the Guest 2815M1115 or 2815M/230 ~equires
aluminum cooling fins running vertically. It is important making two different types of electrical connections: the DC
that the charger have at least 6 inches of unrestricted (12 volt battery system) and the AC (dockside power)
airflow on all sides for effective cooling. Do not install Planning the DC connections
onto a carpeted, upholstered, or varnished surface.
You can configure the Guest 281 SM charger to main:ain one
2. Although this charger is ruggedly designed, avoid or two separate 12 volt batteries. There are several ways to
mounting it in an areathat is open to rain, snow or spray. connect this charger into your present 12 volt system.
3. Avoid mounting this charger within 3 feet of a compass, The simplest and most widely used connection metho i is:
TV or FM radio.
1. Run one red DC wire from each of the charger's :wo DC
4. Select a mounting location which will allow the shortest positive (+) outputs to the positive posts ofeach battery.
DC wires between the charger and the batteries. When charging a single battery, you must conncct both
5. Do not mount this unit directly over your batteries charging outputs to the battery.
because their corrosive fumes can damage the circuitry 2. Connect a black DC wire from the charger's ommon
inside this charger.
negative (-) terminal to the engine block's ommon
6. Be sure that the mounting location will allow access to negative ground terminal.
the connections on the charger after it is mounted. This method is illustrated in diagram 2 on page 7.
Planning the DC connections (cont.) Making the DC connections
This is the most common type ofbattery charger installation:
1. Use the following table to determine the gauge
(thickness) of the wire you will need to carry the current
from the charger to your batteries safely and efficiently.
Recommended DC wire sizes
Length of wire, (in feet) as measured from the battery
chargerto the farthest battery and back to the charger
red (maximum 3% voltage drop)
Max. 10 feet 15 feet 20 feet 25 feet 30 feet 40 feet 50 feet
Two 12 volt 10 l4ga. l2ga. lOga. tOga. tOga. 8 ga. 6ga.
115 I2ga. lOgs. lOga. Sga. 8ga. 6ga. 6ga. I
20 10 ga. 10 ga. 8 ga. 6 ga. 6 ga. 6 ga. 4 ga.
25 10 ga. 8 ga. 6 ga. 6 ga. 6 ga. 4 ga. 4 ga.
--~---- 30 10 ga. 8 ga. 6 ga. 6 ga. 4 ga. 4 ga. 2 ga.
12 volt DC negative (-) ground 40 8 ga. 6 ga. 6 ga. 4 ga. 4 ga. 2 ga. 2 ga.
Two alternative methods for making the DC connections are: 50 6 ga. 6 ga. 4 ga. 4 ga. 2 ga. 2 ga. 1 ga.
I. connecting the DC positive (+) outputs of the charger to from Section E9, table Vii of the American Boat and YachtCouncil (ABYC)
the battery connections on your battery switches or standards and Recommended Practices for 5mail Craft'
2. connecting the DC positive (+) outputs of the charger to 2. Find a path for the DC wires between the chargt~rand
the output posts of your battery isolator. (Do NOT your batteries. Remember to route the wires away from
connect the charger's outputs to an isolator's inputs.) hot surfaces or other areas where the wires could be
These methods are only recommended if your 281 SM will be damaged. Make sure you will be able to fasten a ceVble tie
mounted much closer to your battery switches or battery to a solid surface at least every 18 inches throughout the
isolator, than it will be to your batteries. length of the wires to support them according to ABYC
standard E-9. 1 5h.
For sample diagrams of these types of installations, refer to
Guest document 1-21681. This is included with all Guest -8-
battery switches and isolators, and is available on request.
The DC connections (continued) Remove the two screws on the lower face of the to
expose the wiring terminals. The AC and DC
3. You will also need to establish a path between the
terminals are arranged as shown here:
charger's common DC negative output and the common
negative (-) engine ground connection. This is normally Diagram 3
where the batteries' negative cables connect to the engine
block. (When installing this unit in outboard powered
boats, the DC negative (-) charger output will be
connected directly to the negative (-) terminal of one or
Do not connect any wires to the batteries or to the charger
until AFTER you have cut each one to size, crimped an
appropriate connector onto each end and securely mounted
the wires with the screw-down cable ties. This can help to
prevent accidental short-circuits during your installation.
4. After you have determined an appropriate path for the
DC wires to each battery, cut them to size, leaving three to Battery 2
feet extra. Strip 3/8" of insulation from the battery ends BLACK
of the red wires. Test fit a 5/16" ring terminal onto the to NEGATIVE
threaded positive (+) posts ofyour batteries. Remove the DC ground NOTE: When charging only one I
(engine block) a 12 ga. jumper wire must be a
ring terminal from the battery post and crimp or solder it
between output posts DC #1 and DC
onto the battery end of the red wire. This is the correct way to attach terminals to the
5. Repeat step 4 for the red positive wire leading to the
other battery `s positive post~. Diagram 4 II 1l~
6. Repeat step 4 for the black wire, using a ring terminal
that will fit your engine's negative ground terminal.
7. Use screw mounted cable ties or wire straps to fasten all
the wires between the batteries and the charger onto solid
surfaces. Avoid running wires over sharp edges or near
areas ofextreme heat.
Making the AC connections To use a grounded 3-prong outlet
Do not apply AC power until after you have made all cf the DC
~AUflON! connections. Use AC sockets with a ground fault interrupter
If your vessel does not already have an ABYC approved AC (GFCI) breaker. Do not use 2 blade ground adapter plug i.
dockside power system. The Guest Company strongly recommends 1. Use only a heavy duty 3 conductor AC cord such a:; a Guest
that you consult with a qualified marine electrician before installing part # U-2554 or Radio ShackTM part # 278-1258.
this device. Improper AC connections can cause serious physical 2. Crimp #8 ring terminals onto the three AC wires.
injury and may damage your vessel.
3. Make the AC connections on the front of the charger
Before making any AC connections, be certain that all sources of according to diagram 3 on page 10.
AC current have been safely disconnected from the vessel.
4. Do not plug the charger's cord into an AC outlet until
DON'T ASSUME! after you complete the following steps.
The Guest 2815M/1 15 and 2815M/230 chargers each require three Finishing the wiring connections
AC connections. These connections are: 1. Connect the DC output wires to the DC output ten ninals of
· a Ground wire (normally green or green/yellow), the charger as shown in diagram 3 on page 10. Use a 3/8"
socket wrench or nut driver. Do not over tighten.
· a Neutral wire (normally white or blue) and
2. Connect the other end ofthe black (negative) DC ~ ire to the
· a Hot or Line wire (normally black or brown). engine's common negative ground, or to the negativ~ posts of
To hard wire the charger into your AC system both batteries.
1. Determine a safe path for the AC wiring between the charger and 3. Connect the other ends of the red (positive) DC wires to the
Main AC panel. Avoid hot or sharp surfaces. positive posts of your batteries. NOTE: A small spark may
occur. This is normal.
2. Fasten all wiring onto solid surfaces using screw-mounted cable
4. Confirm that all sources of AC power are turned off. Connect
ties or cable straps every 18 inches. the AC input wires from the AC Main panel to the AC
3. Attach #8 ring terminals onto both ends of the AC wires by terminals on the charger as shown on diagram 3 on page 10.
crimping or soldering. Use a 5/16" socket wrench or nut driver. Do not over tighten.
3. Install a 5 amp AC circuit breaker or fuse into the AC Hot wire 5. Replace the rectangular cover plate over the screw terminals
(black or brown), in your Main AC panel. Attach the AC Hot, on the front of the charger, passing each wire through one of
Ground and Neutral wires from the charger to the appropriate the notches in the cover plate. Attach the cover plate to the
connection points at the Main AC panel. charger with the screws provided.
You are now ready to fasten the charger onto mounting ;urface.
Mounting the Battery Charger
r Problem I
One or more defective or
1. Charger does not
seem to be charging damaged batteries, replace i necessary.
Fasten the charger onto the mounting surface as shown here: batteries.
2. Charger has reduced its 2. Remove the source of
Diagram 5 (Note: Measure the output voltage below the overload or short,
voltages in your charging level due to a DC and th~n re-test the
batteries as described overload or a DC short. charger as described
under "Operation" to under `Operation" to
confirm that there is confirm that it is
actually a charging charging properly.
#10 hex nut 1. Blown DC output fuses I. To repla~efuses:
due to the charger being
a. Unplug AC power.
#10 lock washer attached to the batteries
2. The green LED backwards. b. Remove charger cover.
#10 flat washer light blinks and the 2. A single battery has been c. Inspect both fuses.
amp me er porn er connected to the charger
rubber washer bolt fluctuates rapidly. without tying its two (+) d. If a fuse has blown, use
(included) ONLY u Buss ATO 20
positive outputs together
with a jumper wire (Pg. 10) amp as ~. replacement.
#10 flat washer
I. This could be due to: 1. Disconnect the negative
(-) DC cutput wire from
Fasten all wires leading from the charger onto the mounting a. A dead short or overload, the charger. Re-apply
surface using cable ties. Avoid any sharp edges that might cut 3. The green LED b. One or more bad batteries. AC po'.ver. The green
never turns on. LED only should now
the insulation ofthe wires. This completes your installation. c. A heavy DC load on light. If it does, the
batteries while charging. charger is OK. If not,
Testing your installation (such as lights, pumps, etc.) contact The Guest Co.
Activate the battery charger by re-connecting your dockside AC I. Confirm that AC power is 1. Connect AC power
power. Observe the amp meter on the front of the charger. It available, supply cr reset breaker,
4. The amp meter
should show that current is flowing into your batteries. (Turn does not move and 2. Inspect the charger's AC 2. Disconnect all AC
the green LED does input wiring and wire power s)urces, and then
on several DC lights if you are not sure if the meter is not light, terminals for damage or repair wiring.
registering.) When the batteries have reached full charge, the loose connections.
3. Return i:harger to Guest
green LED light on the front of the charger will turn on. ~ 3. Component failure. Service department.
After 24 hours, use a voltmeter to check the voltage at the 5. The GFCI breaker, 1. There is a problem in the I. Confirn' that the
positive and negative posts of each battery with the charger on. (Ground Fault charger's AC connections charger'; AC cord is
Each battery should read between 13.2 to 13.6 volts DC. Ifyou Circuit Interrupter), or the AC power supply. intact, tien test the AC
turns off whenever . power sipply.
have large batteries, or a continuous DC load is present, 2. Certain brands of GFCI
the char er is
breakers are unusually 2., Contact Guest service
measure the battery voltages after 48 hours. turned on ~
sensitive to "switching"
style power supplies.