Generac Power Systems 0940-1 - Manual (Page 33)

BATTERY INSTALLATION
RECOMMENDED BAHERY
Install a battery that meets the following requirements;
• Battery must be a 12 volt, automotive type storage battery.
• For prevailing ambient temperatures above 32°F (0°C),
use a battery rated 70 amp-hours and capable of deliver­
ing 400 cold cranking amperes.
• For prevailing ambient temperatures below 32°F (0°C), use
a battery rated 95 amp-hours and capable of delivering
450 cold cranking amperes.
IMPORTANT; IF THE BATTERY IS TO BE USED TO
POWER OTHER VEHICLE ACCESSORIES. AS
WELL AS START THE GENERATOR, YOU MAY
NEED A BATTERY WITH A LARGER CAPACITY.
BAHERY CABLE CONNEaiONS
1. Connect the battery cable from the battery post or terminal
indicated by a POSITIVE, POS or (+) to the large lug on
the starter contactor as indicated in Figure 35.
2. Connect the battery cable from the battery post indicated
by a NEGATIVE, NEG or (—) to the frame ground connec­
tion (Figure 35).
NOTE: If the generator compartment is grounded to
the vehicle chassis, you need not connect a NEGA­
TIVE battery cable to the frame ground on the genera­
tor base. Connect the negative cable to the frame
ground of the chassis.
3. Connect cables so the connections are clean and tight.
BAHERY CABLES
Using battery cables that are too long or too small in
diameter may cause a drop in voltage which causes
starting problems. For best cold weather starting, the
voltage drop between battery terminals and the gener­
ator connection point should not exceed 0.12 volts per
100 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 larger
the cable size must be as shown in the chart below.
CABLELENGTH
in Feet (meters) CABLE SIZE
Oto 10(0 to 3) 2‘
11 to 15 (3.4 to 4.5) 0
16 to 20 (4.5 to 6) 000
BAHERY COMPARTMENT
Install the generator battery in its own, vented com­
partment. Place the battery compartment away from
any source of heat, sparks or flame.
Provide ventilation openings in the battery compart­
ment. 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.
‘For warm weather, use No. 2 cable up to 20 feet.
Figure 35 — Connecting Battery Cables
POSmVE CUSTOMER
CONNECTION
STARTER
CONTACTOR (13) TO PANEL
(16) TO STARTER
GROUND
WIRE
(SS) CONTROLLED
12 VOLTS DC
FRAME GROUND
31 —