Electrical system
47
Charge state
The charge state is the level to which the battery is
charged. This state can be measured either by mea-
suring the specific gravity of the battery acid in each
cell or by measuring the off-load voltage of the cell.
The latter cannot be done on modern batteries since
the cells’ electrical connections are enclosed and
therefore not accessible for measurement.
Measuring the off-load voltage across the poles
gives entirely wrong information if any cell(s) should
be defective. The specific gravity of the battery acid
should be measured with a hydrometer instead. Spe-
cific gravity varies with temperature. The lower the
temperature the higher the specific gravity.
The battery is fully charged when the acid density
is .28 g/cm3 at +25°C (77°F). A battery filled with
tropical acid is fully charged when the acid specific
gravity is .24 g/cm3 at +25°C (77°F).
Instruments
Non EVC engines
This manual covers normal instruments. Special in-
struments and senders might be required for some
installations, for example classified systems.
Select a position where the instruments will be unob-
structed and easily readable.
NOTE! The safe distance for the compass location
(to avoid magnetic interference) from the rev coun-
ter is
0.3 m (1 ft). If the compass is placed closer,
compensation must be made. Also see installation
instructions regarding the compass.
Check to make sure that there is sufficient space
underneath for the instruments and leads. Attach the
template (if needed) on the selected position.
Make sure the panel is accessible for inspection and
repair.
The instruments can be installed from a horizontal
plane (lying) to the vertical plane (standing). Other
angles (inclinations) lead to reduced accuracy and
risk of greater wear (shorter life span) of the instru-
ments.
Summary of Contents for D11 series
Page 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
Page 2: ......
Page 208: ...206 References to Service Bulletins Group No Date Concerns ...
Page 209: ...207 Notes ...
Page 210: ...208 Notes ...
Page 212: ...7748655 English 11 2007 ...