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The solar panel will run at a certain voltage, probably 12 or 24 volts. Your battery pack has to match the voltage of your solar panel. When you put batteries in series, the voltage increase, but a …

Are you trying this inside? Those panels just can't produce any usable power indoors under normal incandescent or fluorescent light. In general, a solar panel will output most of it's rated voltage …

With regardsto charging li-ion batteries, the above answer is completely correct, however, Most phones control the charging of their batteries within the phone itself, and all we have to do is supply …

Without more information, it is hard to know your problem. Using a different diode as suggested would help. Also, your panel voltage might be = your battery voltage. What I mean is that the 1.2 vo …

Solar panels act a little differently than you might think. For example, all "12 volt" solar panels actually output 18 volts, as high as 20 volts Voc in bright sunlight. You have to remember this is …

Looks like a David Smith has them all except number 10 which is a feature in some solar controllers where they allow you to connect a load (usually 12 volt lighting) directly to the solar controller. …

I suspect that you will have some problems with this setup. Your solar panel may get up to 6+ volts under no load, but it doesn’t act like your typical voltage source holding to 6 volts and producing …

Excellent question and I cannot for certain tell you the answer except to say that I leave solar panels out in the sun regularly not connected to anything and they have not developed any damage. I wo …

Lots of questions. In general, the microcontrollersellers won't use much energy compared an AC apliance. A car battery is a bad idea. They aren't designed for deep discharges. They are designed to …

Solar panels are interesting in that there are not simply voltage sources. For example, in full sun your panel puts out 17 volts, but attach it directly to a 12 volt battery and the voltage it suppli …

An excellent school project and it would change the face of the RC hobbyist if you could get it to work, but I'm afraid that the answers you have received are correct, the current technology of solar …

The problem with solar power is that it is not a consistent or constant source of power. I.E. The current that solar panel will supply will fluctuate through out the day. As a result it is a good idea …

If I understand you correctly, you have only 5 x 5 inches for solar panels? That would translate to approximately 5 watts if I remember correctly (I will check that figure and edit if necessary). EDI …

On a very basic level you have it correct(or at least a reasonable estimate), but we can get more detailed and in depth. First of all, 12v * 40 Ah gives 480 Wh NOT watts. Watt-hours, I.E. 480 watts …

To the question of inefficiencies, it sounds like you are using some sort of USB powerbank or USB powered or charged device. Since the battery runs at a nominal 3.7 volts, you need to boost from 3.7 …