# charging circuit help

Discussion in 'Homework Help' started by klugerm, Dec 21, 2011.

1. ### klugerm Thread Starter New Member

Dec 21, 2011
5
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I would like to build a simple charging circuit where I can collect light using solar panels (small panels) and store the energy. I would then like to measure the amount of energy collected. I was thinking of hooking up the panels to a capacitor and measuring the voltage at various points in time to see how much energy has been collected. Is it that simple or is there more to it?

2. ### kwso New Member

Jan 3, 2012
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Negative.

You may think about what happen if the solar panel is replaced by a battery.

3. ### jimkeith Active Member

Oct 26, 2011
539
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As an experiment, this is possible--only use a very small PV panel and a very large capacitor so that it does not charge so quickly that you cannot obtain measurements. Set it up for a charge time of about 10 minutes.

Remember the useful relationship: IT = CV
I = current in amps (constant current)
T = elapsed time in seconds
V = volts

Plot Voltage and current vs time on an Excel Spreadsheet Graph

ε = CV²/2

Plot energy vs time

Plot relative efficiency vs output voltage