4 ms·
I wonder what the actually numbers for these watches are. Energy received via the solar cell, energy consumption, battery capacity.
by ant6n 12y ago
I wonder what the actually numbers for these watches are. Energy received via the solar cell, energy consumption, battery capacity.
- maxerickson 12y agoSome bookending it is as least possible. They imply that the draw is no more than 1/60th the input (1 minute of sun for 1 hour). The 3 hours for 6 months would be much lower, checking their documentation, it enters a low power mode that freezes the hands (it still keeps time, the hands are advanced when power becomes available). The input is limited to something like 10 square cm (that's a bit more than 3 cm by 3cm, or a circle ~3.5 cm across). 1000 watts / square meter is usually used as peak sun, so the max input would be ~1 watt (but actual energy captured would probably be more like 1/10 of that). 3 Watt hours is a very respectable figure for a AA battery, so it clearly isn't storing that much power. After looking up that figure, 10% efficiency for the solar cell is probably high.