What I have is a
cube thing with solar panels on the sides, 4 panels total, 1 for each face, each panel contains 6 solar cells, except top and bottom. Each face outputs 6v open circuit 1 amp if I short positive and negative on full sun.
cube thing will not be outdoors. It will be for instance near a window, kitchen, etc. Direct sun will happen rarely over a month period.
But, whats inside the
Inside, I plan to have a powerbank charging itself from the ‘thing’.
But, it will take days to charge that battery from solar panels that will probably never get direct sunlight!
Correct, I guess. So my question is what is the BEST way to arrange the solar panels/cells outputs so that I get the most of them?
Please, elaborate on “the BEST way to arrange” them?
Sure. For instance, should I wire all the panels in parallel to get 6v 4A and since it will only get ambient light even 1/4 of amps is good? Or should I wire them all in series to get 24v ish and 1A and add a buck regulator? that way the usb powerbank will at least push some mah to the battery on ambient light?
Trying to find the best setting, I have attached a simple picture to illustrate the above.
You can see on the attachments how each solar cell string is made, each face of the thing is made of 3 solar cell strings, making 6 volts per cell.
Now, on the other attachment, in Fig 1 you can see that the sun hits one face only, making 6v.
But, if you look at Fig 2 the sun is hitting from a different angle, making about ~6v.
How did I came to the ~6v conclusion?
Fig 4. Sun hits from the top left. It hits A1, A2, B2, & B3 panels. A1 and B3 get the direct sunlight, as for A2 and B2 get the sunlight at an angle of 90 degrees, making the cells less efficient. Instead of making 2v like A1 and B3, I estimate they’ll make 1v each.
There is 4 “faces” in Fig 1 but, if you include the faces in Fig 2, there will be 8 “faces.”
How can I always get 6v regardless of the angle the sunlight is coming from such as Fig 1 vs. Fig 2?