TP-6773 5/12a34 Section 6 Electrical System
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
recommended minimum cable sizes for generator set
battery connections at various generator set-to-battery
distances. 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 hazard. See Section 7 for locations of
the battery connections to the generator set.
Required Battery Cable
(Minimum)
Distance (from battery to
generator set)
2.5 m (8.3 ft.) 5 m (16.4 ft.)
Battery Voltage 12V 24V 12V 24V
6EKOD/5EFKOD
9EKOZD/7EFKOZD
#2 -- -- -- -- #1 -- -- -- --
11EKOZD/9EFKOZD
(1 and 3 Phase)
#2 #4 #1/0 #2
Figure 6-5 Battery Cable Sizing Recommendations
Kohler Co. recommends using one 12-volt battery (or
two for 24-volt systems, 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
6EKOD/5EFKOD
650
9EKOZD/7EFKOZD
11EKOZD9EFKOZD (1 Phase)
11EKOZD9EFKOZD (3 Phase)
Figure 6-6 Battery Recommendations
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.
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