Kohler 3.5CFZ, 4CZ, 5CFZ, 6.5CZ Charging, Specific Gravity Temperature Correction

each cell should not exceed ±0.01. The battery should be charged if the specific gravity is below 1.215 at an electrolyte temperature of 80_F (26.7_C).

NOTE

Some battery testers simply have four or five beads in a tube. Draw electrolyte into the tube. Use instructions with tester; otherwise see the following chart.

°C °F

71.1160

65.6150

60.0140

54.4130

48.9120

43.3110

37.8100

32.290

26.780

21.170

15.660

10 50

4.440

-- 1.1	30
-- 6.7	20
-- 12.2	10

Correction

+ .032
+ .030
+ .028	EXAMPLE NO. 1—
+ .026	Temperature below 80°F (26.7°C)
+ .024
+ .022	Hydrometer Reading 1.250
+ .020	Acid Temperature 20°F (--6.7°C)

+.018

+.016 Subtract .024 Specific Gravity

+ .014 Corrected Specific Gravity is 1.226

+ .012
+ .010
+ .008
+ .006	EXAMPLE NO. 2—
+ .004	Temperature above 80°F (26.7°C)
+ .002
0	Hydrometer Reading 1.235
-- .002	Acid Temperature 100°F (37.8°C)
-- .004
	Add .008 Specific Gravity
--. 006
-- .008	Corrected Specific Gravity is

1.243

-- .010 -- .012 -- .014 -- .016 -- .018 -- .020 -- .022 -- .024 -- .026 -- .028

Five Beads Floating— Overcharged

Four Beads Floating— Fully Charged

Three Beads Floating— A Good Charge

One or Two Beads Floating— A Low Charge

No Beads Floating— A Dead Battery

Charging

The engine battery charging circuit will provide a charge of 12 volts at up to 10 amps.

NOTE

If the battery is used while the craft is docked and the generator set is not running i.e., auxiliary lights, two-way radio, etc., the battery will be drained and may not have enough power to start the generator set later. Therefore, it may be necessary to connect a battery charger while the craft is docked and running on shore power.

1-787

The temperature correction amounts to about .004 (4 “points”) of specific gravity for each 10°F (5.5°C) change in temperature.

Figure 3-21. Specific Gravity

Temperature Correction

TP-5695 12/93 Scheduled Maintenance 3-19