Narada 6V Series, Operation Manual

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6V&12V Serials
15 16
The 6V & 12V batteries require ventilation, drying, and avoid direct sunlight. The batteries experience
self-discharge in open circuit state, the result is that open circuit voltage decreases, and the capacity
also decreases. The self-discharge rate is related with ambient temperature. The self-discharge
rate is smaller when the ambient temperature is lower, otherwise is larger. If the open circuit voltage
is lower than 2.10V/cell, or storage period reach 6 months shown in following table, the batteries
should be recharged to avoid damage caused by self-discharge.
| Storage
It’s suggested to record the storage time in the periodic maintenance record and record the time when
another necessary supplemental charge should be made. The quality certificates and packages of
6V & 12V series batteries record the latest charge time of the batteries, next charge time can be
calculated according to this charge time.
Above 30°C
Below 30°C
3 months
6 months
Storage temperature Max. Storage period
Proper maintenance will prolong the life of a battery and will aid in assuring that it is capable of
satisfying its design requirements. A good battery maintenance program will serve as a valuable aid
in determining the need for battery replacement. The users must consider their particular application
and reliability needs if maintenance procedures, other than those recommended in this document,
are used. Battery maintenance should be performed by personnel knowledgeable of batteries and
the safety precautions involved.
| General
| Inspection
Maintenance
Chapter
Four/04
Monthly Maintenance
■ Keep the battery-room clean.
■ Measure and record the ambient temperature of the battery-room.
■ Check each battery’s cleanness; check damage and overheating trace of the terminal, container
and lid.
■ Measure and record the total voltage and floating current of the battery system.
Yearly Maintenance
■ Repeat quarterly maintenance and inspection.
■ Check whether connectors are loose or not every year.
■ Make a discharge test to check with exact load every year, discharging 30-40% of rated capacity.
Make an 80%DOD capacity test every year after three years’ operation.
Special inspections
If the battery has experienced an abnormal condition (such as a severe discharge, overcharge, or
extreme high ambient temperature), an inspection should be made to assure that the battery has not
been damaged. Include the requirements for the yearly inspection.
Quarterly Maintenance
■ Repeat monthly inspection.
■ Measure and record floating voltage of every on-line battery. If more than two cells’ voltage is
less than 2.18Vpc after temperature compensation, the batteries need to be equalization charged.