Affordable Solar & Wind

How do I replace AA batteries in outdoor solar lights with ultra-capacitor?

I have been reading on the Internet that it is possible to replace AA batteries with an ultra-capacitor. Is there a how-to article on this? Do I just wire and solder one 2.7v ultra-capacitor in place of the batteries?

Just match the polarity and make sure that the peak voltage from your solar cell doesn't exceed the voltage rating of the cap. I suspect that 2.7 won't be enough unless you shunt it with a voltage clamp such as a suitably sized zener diode.

I don't see the point of it though. AA batteries will store far more energy in a given amount of space and deliver it at a relatively constant voltage until nearly exhausted. Lots cheaper too.

The formula for energy stored in watt seconds in a capacitor is 1/2*C*V^2
A 10 farad capacitor charged to 2.7 volts will hold a whopping 19.7 wattseconds of energy.

A pair of AA NiMH cells might easily have a capacity of 2000 maH at 2.4 volts or 4.8 watthours or 17,200 wattseconds.

Don

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