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Assessment of the state of charge via the battery acid density
If the acid density at 27°C is 1.24 kg/dm³ or less, please first charge the battery before carrying out fur -
ther tests and check the acid density again after one hour of standing time.
Acid density at 27°C in kg/dm³ State of charge
1,25 - 1,28
1,20 - 1,24
Lower as 1,20
The acid density should be the same in all cells of a good battery. Maximum permissible tolerance bet -
ween highest and lowest measured value of the 6 cells: 0.03 kg/dm³.
If the acid density is the same in all cells but less than 1.25 kg/dm³, please charge the battery.
Temperature compensation
Due to the chemical reactions that take place in a lead-acid battery, the test results depend on the bat -
tery temperature. In order to obtain the most accurate test results possible, compensation must be car-
ried out from approx. -8°C.
This is achieved by subtracting 50 amperes of cold test current from the printed value of the battery's
cold test current for each -10°C cold. This means that at -20°C 100 A and at -30°C 150 A cold test cur-
rent are subtracted.
Example: If the printed battery cold test current is 500 A and the test is carried out at -18°C, use the
400 CCA scale.
Testing the charging system
With the help of the battery tester, many small general faults in the charging circuit can be quickly and
easily detected.
The motor should be at normal operating temperature for testing.
Connect the battery tester to the vehicle battery with the correct polarity.
•
Start the engine and run it at a speed of at least 1500 rpm.
•
Do not operate the test switch on the unit!
•
Read the display when the electrical consumers (light, fan, etc.) are switched off. The need-
•
le should be in the green area (OK) at approx. 14 volts.
When the electrical consumers are switched on, the needle should remain in the green
•
area.
If the needle is in the red area above or below the green area, this indicates a fault in the
•
charging circuit (e.g. defective charge controller).
© by WilTec Wildanger Technik GmbH
http://www.WilTec.de
http://www.aoyue.eu
http://www.teichtip.de
Charged
Half charged
Poorly charged
Artikel 62553
Actions
Test possible
Charging recommended
Load immediately
Seite 7
11 2020-1
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