Dulas Solar VC150, Handbook

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if the level of water in any cell has ever dropped below the op of the metal plates.
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where he obtains his distilled water, and how often.
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what the distilled water is stored in, and how is the container closed.
This information will help you determine if the batteries are in good condition. Since:
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if a cell in a battery needs water added more often than the other cells, then this
cell is no longer operating correctly and the battery should be replaced.
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if a battery needs water often (more than once in six months) then it is either
poorly ventilated exposed to direct sunlight, or is being deeply discharged in which
case its life will be considerably shortened.
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if a water added to a battery is not clean and distilled; the battery life will be
shortened.
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if the plates of the battery are exposed to the air, then they are damaged and the
battery should be replaced.
(j) If you have DONE ALL of the above user Maintenance Tasks and have not found
anything which would cause the refrigerator not to operate correctly, then PROCEED
TO TEE NEXT STEP ON THE FAULT FINDING CHART.