# Is there a maximum switching frequency for solar cells ?

I'm wondering what the frequency response of a solar cell is. Does a solar cell behave like a low pass filter e.g if i switch a load at 1 MHz, 10 MHz, 100 MHz ? Does the output power decrease if the frequency is too high ?

I'm asking because there exists a Maximum Power Point Tracking Method which is called "Pertub and Observe" . I'm wondering how fast you can change the load and measure the voltage at the load (e.g with a high speed adc) and still get accurate readings.

Will i have problems regarding the frequency response of a solar cell if I change the load 1 Million Times(e.g with a appropriate Transistor) and read the result with a high speed ADC, let's say with 1 Mega Samples per Second.

• What would be the point of using such a ridiculous sample rate? Conditions that affect the output of a solar panel simply don't change anywhere near that fast. – Dave Tweed Oct 3 '17 at 13:01
• You say "solar cell" so I think: large cells for converting sunlight into electrical energy. The sun's light intensity changes are quite low in frequency so how would the frequency response matter? Unless you mean photo diode or photo transistor which are light sensitive sensors? – Bimpelrekkie Oct 3 '17 at 13:11
• @Bimpelrekkie I mean solar cell, yes. At both: Yes you are both correct, the environment doesn't change that fast but this is not the reason for my question. The reason for it is, that the solar panel powers a circuit which needs to be disconnected during the mppt measurement . That means in the meantime the circuit needs to be powered by Capacitors. The shorter the measurement time the smaller the capacitors may be. I'm aware that there a alternatives, but i'm currently researching the feasibility about this method hence the question regarding the frequency response. – KoKlA Oct 3 '17 at 13:28
• OK, but then you're not really switching the solar cells themselves then. You're switching the load of the solar cells. – Bimpelrekkie Oct 3 '17 at 13:34
• @Bimpelrekkie yes exactly. I should have worded the question a little bit better. – KoKlA Oct 3 '17 at 13:49