Generac Power Systems 00862-2 - Manual (Page 34)

INSTALLATION
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Section 2 - Installation
Series QP55-G Recreational Vehicle Generator
2.7 BATTERY INSTALLATION
• 2.7.1 RECOMMENDED BATTERY___________________
Install a battery that meets the following
requirements:
• The battery must be a 12-volt, automotive type
storage battery.
• For prevailing ambient temperatures above 32° F
(0° C), use a batteiy rated 70 amp-hours and
capable of delivering 400 cold-cranking amperes.
• For prevailing ambient temperatures below 32° F
(0° C), use a battery rated 95 amp-hours and
capable of delivering 400 cold-cranking amperes.
NOTE:
If the battery is to be used to power other vehi­
cle accessories, as well as start the generator,
you may need a battery with a larger capacity.
• 2.7.2 BATTERY CABLES
Using batteiy cables that are too long or too small in
diameter may cause a drop in voltage, which causes
starting problems. For the best cold weather starting,
the voltage drop between batteiy terminals and the
generator connection point should not exceed 0.12
volts per 100 amperes of cranking current.
These generators are rated at about 100 DC
amperes of cranking current.
Select battery cables based on (a) cable length and (b)
prevailing
ambient temperatures. Generally, the
longer the cable and the colder the weather, the larg­
er the cable size must be, as shown in the chart.
CABLE LENGTH
in Feet (meters)
CABLE SIZE
0 to 10 (0 to 3) 2*
11 to 15 (3.4 to 4.5) 0
16 to 20 (4.5 to 6) 000
♦ 2.7.3 BATTERY CABLE CONNECTIONS
1. Connect the battery cable from the battery post
or terminal indicated by a POSITIVE, POS or (+)
to the lug on the starter contactor (Figure 2.19).
NOTE:
Check to be sure the battery cable hoot for the
starter cable has been
installed.
2 .
3.
Connect the battery cable from the battery post
indicated by a NEGATIVE, NEG or (-) to the
frame ground connection (Figure 2.19).
Connect cables so the connectors are clean
and tight.
Figure 2.19 - Connecting Battery Cables
SIDE VIEW OF GENERATOR
♦ For warm
weather, use No.
2
cable up to
20
feet.
- ♦ 2.7.4 BATTERY COMPARTMENT ____________________
Install the generator battery in its own, vented com­
partment.
Place the batteiy compartment away
from any source of heat, sparks or flame.
Provide ventilation openings in the batteiy com­
partment. The minimum size of openings should be
2 square inches at the top of the compartment.
Mount the battery on a strong, rigid supporting
structure, where leaks and spills of battery fluid
will not cause damage.
32 Generac® Power Systems, Inc.