Holiday imperial 2001, Руководство пользователя

Страница: 204 / 301

NOTE: Driving without the tray secured can result in dam-
ages.
CAUTION: Many types of petroleum based products or bat-
tery by-products can damage the paint finish. Do not allow
these types of chemicals to get on the paint finish. If the
chemicals do get on the painted surfaces, immediately rinse
the surface using plenty of water with a mild automotive
detergent.
The only way to test a battery’s electrolyte solution is with a hydrometer.
Many styles are available, from types with cylinder graduation (shown here) to
types with floating balls. Hydrometers can be purchased from most auto parts
stores. The hydrometer tests the battery’s electrolyte solution which is measured
in specific gravity. Distilled water has a specific assigned gravity of 1,000. The
hydrometer is calibrated to this mark. Pure sulfuric acid has a specific gravity
reading of 1,840. The acid is 1.84 times heavier than water. The electrolyte
solution is about 64% water to 36% acid (fully charged battery). Hydrometer’s
with cylinder graduation are graphed and the exact state of specific gravity can
be determined.
Temperature and recent battery activity (charging or discharging) affect the
hydrometer readings. It is best to check the battery when it has been “at rest”
for at least three hours, although readings taken at other times will give a “ball
park” figure. When using the hydrometer, draw the electrolyte solution up into
the tube. Allow the hydrometer to attain the same temperature as the electrolyte
solution. Note the reading for that cell. Complete the same test for the rest of
the cells on that battery bank.
The hydrometer is calibrated at 80° F. Temperature affects the hydrometer
readings. The higher the electrolyte temperature, the higher the specific gravity
reading. The lower the temperature, the lower the specific gravity reading will
be. Add or subtract four points for each 10° variance from the 80° F chart.
Readings between cells should not vary more than 50 points.
If one cell in a particular battery bank being tested is at a 50% state of
charge while the others are indicating a full charge, charge only that battery to
see if the low cell will come up. At the same time, do not over charge the
“healthy” cells.
If the low cell does not come up after charging, this battery can damage the
rest of the battery bank and should be replaced. An accurate digital volt meter +
- .5% will also give an indicator of the battery’s state of charge.
Another test that can be performed is to place a specific load on the battery
for a predetermined length of time equal to that particular battery’s rating. This
machine is usually an adjustable carbon pile that can vary the load being
Electrical Systems - House
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
I M P E R I A L
8 • 2 0 4
Testing the Battery
Temperature Correction Chart