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What kind of solar panel is needed to fully charged a 3.5v 400mA battery?
I would like to know how many watts should the solar panel be to fully charge the battery in full sunlight with about 5,5 kWh/m2/day of solar irradiation.
Thank you!
I would need to charge it in 6 to 8 hours
Your battery capacity is 3.5 Volts * 0.4 Ampere-hours = 1.4 Watt-hours.
Assuming a charging efficiency of 66%, the charger will consume 1.4/0.66= 2.12 Watt-hours
You want to charge it in 6-8 h, so you need a panel that provides between 2.12/8=0.265W and 2.12/6=0.35W.
You could just buy a panel that is rated around that power, but if you actually want to estimate the surface,
5.5kWh/m2/day = 687.5 W/m2 (assuming 8 hours of strong daylight)
Current solar panels have an efficiency around 15%, so
Area = Power / Radiation / efficiency = 0.35/687.5/0.15 = 0.0034 m2 = 34 cm2 (approx 6x6 cm)
It's kinda small, but it's a small battery too.
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