34 Generac
®
Power Systems, Inc.
2.7.6 SENSING HARNESS
A sensing harness has been provided with the gener-
ator to connect to the inverter (Figure 2.22). It is 12
feet long, however, it is also available in a 24 foot
length: Model # 04612-0. The four (4) DC power
wires (Red, Blue Black, and Green) may be cut to the
desired length to meet the installation (see Figure
2.22).
DO NOT in any way cut or shorten the
sensing harness. If the harness is too long,
simply tie the excess up neatly with standard
cable ties.
2.8 BATTERY INSTALLATION
2.8.1 RECOMMENDED BATTERY
Install a battery that meets the following require-
ments:
• 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 capa-
ble of delivering 400 cold cranking amperes.
• For prevailing ambient temperatures below 32°F
(0°C), use a battery rated 95 amp-hours and capa-
ble 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.
2.8.2 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 best cold weather starting, the
voltage drop between battery terminals and the gen-
erator 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 larg-
er the cable size must be as shown in the following
chart.
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Section 2 – Installation
IMPACT-36 plus II Recreational Vehicle Generator
Figure 2.22 — Generator to Inverter Connection
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