Kohler 17.5EFOZ/20EOZ, 8.5EFOZ, 9EFOZ/10EOZ, 80EFOZ/99EOZ, 6.5EFOZ/8EOZ, 4EFOZ/5EOZ manual Wiring, Cca

6.5 Battery

Batteries and their installation must conform to USCG Regulations 183.420 (a) through (g). Provide generator sets with batteries separate from the propulsion engine’s whenever possible. The starting/charging systems of both the generator set and the engine must have a common negative (--) ground.

USCG Regulation 183.415, Grounding, requires connection of a common conductor to each grounded cranking-motor circuit. Size the conductor to match the larger of the engine’s two battery cables. Figure 6-5 lists cable sizes for generator set battery connections at various ambient temperatures. Connecting a common conductor to each grounded cranking motor circuit prevents the starting motor current from using alternative electrical paths should the cranking motor ground circuit be restricted or open because of oxidation or loose hardware. Alternative electrical paths include metallic fuel lines that can pose a fire hazard. See Figure 6-7 and Section 7 for battery connections to the generator set.

Distance between		Cable Size (AWG)
Generator Set		At –18°C	At 0°C	At 24°C
and Battery m (ft.)		(0°F)	(32°F)	(75°F)
12.2	(40)	00	0	1
9.1	(30)	0	1	2
7.6	(25)	1	2	4
6.1	(20)	2	2	6
4.6	(15)	2	4	6
3.0	(10)	4	6	8
1.5	(5)	6	6	8
0.8	(2.5)	8	8	8

Figure 6-5 Battery Cable Sizes

Kohler Co. recommends using one 12-volt or 24-volt battery (as the spec requires) to start the generator. See Figure 6-6 for minimum cold cranking amps (CCA) recommendations.

12-Volt Starting Battery Size CCA at -18°C (0°F) or 100 Amp. Hr.

Models	CCA
3.5–20EFOZ and
4--24EOZ	500
23/27/100/125EFOZ and
28/32/125/150EOZ	800
33--80EFOZ and
40--99EOZ	640

Figure 6-6 Battery Recommendations

			1
	5
	4	3	2
			TP-5586-6
1.	Starter solenoid
2.	Battery positive (+) connection
3.	Equipment ground
4.	Battery negative (--) connection
5.	Engine block mount

Figure 6-7 Battery Connections (5EOZ/4EFOZ model shown)

6.6 Wiring

Use only stranded copper wire. Conform to USCG Regulations 183.425 through 183.460 for wire gauges and insulation, conductor temperature ratings, sheath stripping, conductor support and protection, conductor terminals and splices, and over-current protection (circuit breakers, fuses). Use rubber grommets and cable ties as necessary to protect and secure the wire from sharp objects, the exhaust system, and moving parts.

24 Section 6 Electrical System TP-6069 6/03