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13.
Guide to Charging Time for the Solar Powered Watch
The charging time varies according to the model (including the color of the watch face).
The following data should only be used as a guideline.
Illuminance
(lx) Environment
Time required to fully
charge from stopped
status (approximate)
Time required to store
energy for one day of
operation when the second
hand is moving at 1-second
intervals (approximate)
3,000 20 cm (8 in.) beneath a
30 W orescent light 200 hours 40 minutes
10,000 Under cloudy skies 60 hours 12 minutes
100,000 Direct summer sunlight 30 hours 3 minutes
The table can be used to nd an estimate of the amount of energy that the watch can
store depending on the environment and amount of time the watch is charged.
For example, you can see that the energy that can be stored when the watch is subjected
to approximately 4 hours of light under cloudy skies is suf cient to operate the watch for
about 20 days.
More energy can be stored by allowing even brighter light to strike the watch face for an
even longer time. The watch can be ef ciently charged in less time under sunlight than
under uorescent lighting.
Although the watch becomes hot when placed under direct
sunlight for an extended period, there is no problem as long
as the temperature does not exceed 60°C (140°F).
[NOTE] A fully charged battery will run the watch for about 8 months without further
charging. The watch will maintain its accuracy for about 2 years when running
in the power saving mode. Charge the watch every day, as it will take a
long time to recharge it, as is indicated in the table, when it stops due to an
insuf cient charging.
It is recommended that the watch is charged in direct sunlight for a long time
once a month.
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