Module No. 5531

Solar Charging

This watch runs on power supplied from a rechargeable (secondary) battery that is charged by a solar panel. The solar panel is integrated into the face of the watch, and power is generated whenever the face is exposed to light.

Charging the Watch

When you are not wearing the watch, put it in a location where it is exposed to bright light.


While you are wearing the watch, make sure that its face (solar panel) is not blocked from the light by the sleeve of your clothing. Power generation efficiency is reduced even when the face of the watch is blocked only partially.


Checking the Charge Level

Immediately after you press (C) to return to the Timekeeping Mode, the day of the week hand will indicate the battery charge level. After a short while, the day of the week hand will return to indicating the current day of the week.


Good (high charge)

Good (medium charge)

Low Battery

Remaining Charge and Dead Battery

You can determine if the charge level is low by checking the hand movement. Functions become disabled as battery power goes low.

Low Battery Power

The second hand jumps at two-second intervals.


Dead Battery

All hands and the day indicator are stopped.


Charging Time Guidelines

The table below shows guidelines for approximate charging times.

Required Charging Time for 1-day Use

Light Intensity

Approximate Charging Time



8 minutes


30 minutes


48 minutes


8 hours

Time Required to Achieve Next Charge Level

Light Intensity

Approximate Charging Time

Charge Level 1

Charge Level 2



2 hours

27 hours


6 hours

101 hours


10 hours

164 hours


106 hours


Charge Level 1:

Time from dead battery until hand movement starts

Charge Level 2:

Time from hand movement starts until a full charge

Light Intensity

Sunny day, outdoors (50,000 lux)

Sunny day, near a window (10,000 lux)

Overcast day, near a window (5,000 lux)

Indoor fluorescent lighting (500 lux)

Power Saving

Leaving the watch in a dark location for about one hour between the hours of 10 p.m. and 6 a.m. will cause the second hand to stop, and the watch will enter Level 1 power saving. If the watch is left in this condition for six or seven days, all hands will stop and the watch will enter Level 2 power saving.

Level 1:

Basic timekeeping functions are operational.

Level 2:

Only the day indicator is operational.

Recovering from Power Saving Operation

Press any button or place the watch in a well-lit area to recover from power saving.