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I have 6 solar cells. each is 5.5v (max efficiency) at 150mA
I would like to wire them to a USB jack to charge my iphone.
I've built several mock ups, at a very simple design. some with a regulator but I do not like as I have to wire them in series to accommodate for the voltage drop out. This also then drops the amp to 1/2 whats possible
I have then been testing a bunch of designs using a step up regulator MAX756, various capacitors, resistors and diodes.
I feel like I just lack the complete knowledge to get what I'm after.
The main issue being that the panels operate at the 5.5v 150ma at peak efficiency, which is the first 20-30 minutes in full sunlight. After this amount of time they drop to 4.5v range and will no longer charge.
I would like to avoid having to design a battery into the system. And would like to get as many amps as possible to facilitate charging quickly. I could even go to 9 solar cells.
I would like to use elements that minimize the need for heat shi...
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