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Planning
connections (cont.)
the DC
This is the most common type ofbattery charger installation:
Diagram 2
Two 12 volt
batteries
--~----
12 volt DC negative
Two alternative methods for making the DC connections are:
I. connecting the DC positive (+) outputs of the charger to
the battery connections on your battery switches or
2. connecting the DC positive (+) outputs of the charger to
the
posts of your battery isolator.
output
connect the charger's outputs to an isolator's inputs.)
are
These methods
only recommended if your 281 SM will be
mounted much closer to your battery switches or battery
isolator, than it will be to your batteries.
For sample diagrams of these types of installations, refer to
Guest document 1-21681. This is included with all Guest
battery switches and isolators, and is available on request.
-7-
red
(-)
ground
(Do NOT
Making the DC connections
1. Use the following table to determine the gauge
(thickness) of the wire you will need to
from the charger to your batteries safely and efficiently.
Recommended DC wire
Length of wire, (in feet) as measured from the
chargerto the farthest battery
(maximum 3% voltage drop)
Max.
10 feet
15 feet
20 feet
amps
10
l4ga.
l2ga.
lOga.
115
I2ga.
lOgs.
lOga.
20
10 ga.
10 ga.
8 ga.
25
10 ga.
8 ga.
6 ga.
30
10 ga.
8 ga.
6 ga.
40
8 ga.
6 ga.
6 ga.
50
6 ga.
6 ga.
4 ga.
from Section
table
ofthe American Boat and YachtCouncil (ABYC)
E9,
Vii
and Recommended Practices for 5mail Craft'
standards
2. Find a path for the DC wires between the chargt~rand
your batteries. Remember to route the wires away from
hot surfaces or other areas where the wires could be
damaged. Make sure you will be able
to a solid surface at least every 18 inches throughout the
length of the wires to support them according to ABYC
standard E-9. 1 5h.
carry
the current
sizes
battery
and back to the charger
40 feet
50 feet
25 feet
30 feet
tOga.
tOga.
8 ga.
6ga.
Sga.
8ga.
6ga.
6ga.
6 ga.
6 ga.
6 ga.
4 ga.
6 ga.
6 ga.
4 ga.
4 ga.
6 ga.
4 ga.
4 ga.
2 ga.
2 ga.
4 ga.
4 ga.
2 ga.
4 ga.
2 ga.
2 ga.
1 ga.
to fasten a ceVble tie
-8-
I
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