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
Solar Lighting | Solar Garden Lights | Outdoor Solar Lights
solar outdoor light
Tags: energy · led · light · lighting · solar · solar outdoor light post · solar outdoor lighting · solar outdoor lighting fixtures · solar outdoor lighting home depot · solar outdoor lighting reviewsNo Comments
0 responses so far ↓
Like gas stations in rural Texas after 10 pm, comments are closed.