Guardian Technologies 004270-3 - Manual (Page 35)

Generac ® Power Systems, Inc. 33
2.7 BATTERY INSTALLATION
2.7.1 RECOMMENDED BATTERY
Install a battery that meets the following require-
ments:
• The battery must be a 12-volt, automotive-type
storage battery.
• Use a battery with minimum ratings of 70 amp-
hours and 360 cold-cranking amps.
NOTE:
If the battery is to be used to power other vehicle
accessories, as well as to start the generator, a bat-
tery with a larger capacity may be necessary.
2.7.2 BATTERY CABLES
Using battery 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 battery terminals and the
generator connection point should not exceed 0.12
volts per 100 amps of cranking current.
The QUIETPACT™ 75D generator is rated at about
160 DC amps of cranking current to operate the
starter and glow plugs.
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.
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 insulated lug on the unit frame (Figure
2.19).
NOTE:
Check to be sure the cable boot for the positive
cable has been installed.
2. Connect the battery cable from the battery post,
indicated by a NEGATIVE, NEG, or (-), to the
vehicle frame ground connection (Figure 2.19).
3. Connect a cable from the vehicle frame ground to
the negative post on the generator frame.
4. Connect cables so the connectors are clean
and tight.
Figure 2.19 – Connecting Battery Cables
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Section 2 – Installation
QUIETPACT™ 75D Recreational Vehicle Generator
Figure 2.18 – Installation With Isolation Receptacle
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
*For warm weather, use No. 2 cable up to 20 feet.