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Can i use a solar panel to charge a cell phone? Answered

I made a call phone that looks like a calculator so i can use it in school and what not and everyone thinks its super amazing but the battery dies really fast, i checked my connections and nothings touching so i think the batteries defective but my friend gave me the idea to use the solar panel from the calculator the charge it. I get about 1 volt under normal lighting about about 2.25 volts under a bright light (directly under a light bulb).

Discussions

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subwrxdragon

6 years ago

It aint gonna work bro..........lololololololol

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-max-

7 years ago

you would need a solar cell about 3 inches square. my best answer would be to get your hands on a old (working) phone with a good battery inside. the bigger the better.

my other idea id to make a crank for it, of a "shake N'go" mechanism (which is not very practical for many obvious reasons.)

if you know how to make an inductive charger you can hide in your desk, and a pickup in your gadget, that may work, but you might destroy the sensitive circuitry inside.

disclaimer: do this at your own cost. their is a reason why phones are banned.

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Jimmy Proton-max-

Answer 7 years ago

well as you can see there is no room for a bigger solar panel or battery then the one i got. I was just hoping that this could keep the battery going longer, no need for a full charge. The only thing i was worried about is over charging cause i was going to hook it directly to the + and - terminals on the battery.

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-max-Jimmy Proton

Answer 7 years ago

well with a small solar cell you definitely will not need to worry about overcharging. but consider using a blocker diode (not any old silicone rectifier, but a germanium diode. [or at least a scotchy diode] these are recommended.) a diode will stop current from flowing from battery to the solar cell.

with a standard diode you will have a significant voltage drop (0.6V). get your hands on a few germanium diodes (they have a voltage drop of about 0.2V).

you mentioned earlier your cell puts out about 1V. well a fully charged lithium ion battery holds about 4.2V if it goes below 2.25V, (amusing its protected) the internal circuity will cut off power.

so math time!
1.1V - 0.2 = 0.9V that is way too low. if you get super lucky
2.5V - 0.1 = 2.15 still too low.

im sorry it didnt work out for you. all i can say is more solar panels, or better battery.

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-max--max-

Answer 7 years ago

sorry, anywhere i said "silicone" i meant silicon. and if you get very unlucky,
0.9V from little solar energy minus
0.6 or 0.7 voltage drop equals
0.3V or 0.2V

there is more energy in a radio antenna than the limitations (small cell, large load, voltage drops). but its best to try! numbers (especially mine) don't say everything! you might get lucky, who knows?!

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Jimmy Proton-max-

Answer 7 years ago

So just hook the cell up to the battery with a germanium diode and that should be it? all I'm looking for is something to keep that battery lasting longer.

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Jimmy Proton-max-

Answer 7 years ago

also this phone cannot be activated because it is an altel phone so its no good for communications but i can take pictures/video and play music on it and some of the teachers already know about it and they think its cool.

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Mudbud

7 years ago

You need a stronger solar panel and/or a new battery... It also depends on the battery type like if its Lithium or NiCad, etc

Short answer: Yes

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Jimmy ProtonMudbud

Answer 7 years ago

That's the only working solar panel i have but despite its small size it would still work at least a little, right? Its lithium-ion....like every other cell phone battery.

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MudbudJimmy Proton

Answer 7 years ago

even if it did work, it won't charge the battery high enough, plus you need to have a regulator in there so it will stabilize the current and whatnot