Raspberry Pi Pico power consumption
From the table above, we can see that the mean maximum current required at 25C under load is 91.6mA, so we’ll need:
That’s a pretty intense load, so let’s take half that as our reference: 230mW
Finding the right panel size
At first glance, we could think that one should work as it can provide up to 500mW. But that’s only in perfect conditions (full sun). In order to size our panel, we need to figure out how much energy our panel will get in a day at the geographical location we intend to put it.
As an example, we’ll take Barcelona, Spain, as the location. To make sure our panel will work even under the worst conditions, we’ll use the month of January for our calculations. From the website we get:
The average energy received per day is: 
In a full day, we get 
The key point here is that we can’t extract 100% of the sun’s energy. From the panel datasheet, we can see that it has a surface of 
, and that can it can extract 500mW. That’s only 86.5W/m2, much less than the 1000W/m2 that was shining into it.
How does a panel work
Designing a charging circuit
Circuit
Panel
Chip
Sizing the supercapacitor
To see how much our circuit will last with the supercapacitors, we need 3 values:
Time = 
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