How do you find out the efficiency of a solar cell with voltage and current measurements?
The PV cell that i have is 2V and 200mA, (i know, a cheap one lol), and it is 66x95mm. i need to find out what efficiency it is so i can determine what W bulb it can generate electricity from (for an experiment). Thanks!
If you want an accurate measurement, you need a variable power resistor.
2 v and 0.2 amps is about 10 ohms, and the power is 4 watts. So if you can get a 20 ohm variable power resistor, you can measure the voltage and current at different load resistors, and calculate the power for each setting. Find the point where the power is at a maximum, and that is the maximum power output.
You need to make these measurements with full sun on the panel and all the measurements should be made with the same sun conditions.
You can get a rough idea by 2v x 0.2 amps = 4 watts, but that may not be very accurate.
Once you have the max power, you can compare it to the theoretical maximum solar power to calculate the efficiency. The maximum solar power you can get as a power per square foot for your location and time of year.
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