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For my mobile robots I have traditionally used AA or AA batteries as power sources, which is fine but does mean that there is a minimum size of chassis that is needed and that the motors need to be more powerful in order to move the heavy batteries about. For some time I have been toying with the idea of moving to LiPo batteries and/or using solar cells to power the mobile robots (Solar Cell On A Sunny Day ) and it seems to me that these power sources need a DC-DC convertor ,as they provide a lo ...
As the sun was shining much more brightly today I decided to repeat my measurements of the solar cell (Solar Cell Maximum Power Output (Hazy Sunshine) ) to try and obtain a more detailed view. This time I only took measurements in the range 600 Ohms to 10 Ohms, in steps of 100 Ohms down to 200 Ohms and then in steps of 10 Ohms. The graph is displayed below and seems much better.   This has produced a much better curve and shows that the peak power output of 426 mW is at 60 Ohms load, com ...
For some time I have been intending to create some sort of solar powered project but never quite got around to it. However, a few weeks ago I decided to do something about this lack and purchased some solar cells, which were rated at a nominal 6V and 90 mA maximum, with a size of 120mm x 38 mm. These voltage and current ratings are nominal ideal values in very bright sunshine and optimum loading and I was not expecting to get 90 mA at 6 V. But I wanted to find out the actual characteristics so I ...