12 votes
Accepted

How does this garden solar light work?

I do not understand how the small current from emitter to base makes it back to the negative terminal of the battery, how is it getting to ground? Individual PV cell is like a diode so it can ...
kaosad's user avatar
  • 586
8 votes

How does this garden solar light work?

Some circuits should be redrawn to de-clutter: - How does this garden solar light work? When the solar panel illuminates and produces up to 4.5 volts, the 1N914 is in the charge path to the battery ...
Andy aka's user avatar
  • 452k
4 votes

How does this garden solar light work?

The solar cells, along with charging the battery, are connected to the base of the transistor through the resistor. The transistor is a PNP so it is on when the base is 0.7 V below the emitter voltage....
GodJihyo's user avatar
  • 22k
3 votes

How to implement an automatic and continuous variable load across a solar cell to obtain its I-V characteristics?

As I can have only 20 sample points sufficient to construct the I-V curve and the load needs to be varied between 10kohm to 0 ohm, how can I accomplish that so that I can get sufficient samples as ...
The Photon's user avatar
  • 129k
2 votes
Accepted

Connecting solar cells directly to battery

From what I've read, the panels are supposed to match themselves to the voltage they are connected to, so even if they aren't at maximum efficiency they will be the correct voltage to the charge the ...
hobbs's user avatar
  • 7,330
1 vote

How to implement an automatic and continuous variable load across a solar cell to obtain its I-V characteristics?

Currently, I can only have 20 different resistors ... 20 different resistors is way overkill, if you can select more than one at a time, give you plenty of resistance variation. Let's say you have ...
Neil_UK's user avatar
  • 165k
1 vote

How to check if a solar panel has a built-in blocking diode?

If the panel is in the dark and you force its voltage to its nominal open circuit voltage, it should draw something like its nominal short circuit current if there is no blocking diode. If there is a ...
John Doty's user avatar
  • 3,679

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