What is the voltage of a Li-Ion cell?

ONE cell manufactured by WHOM ???

They're usually charged at 4.2V and below ~3.5V they're dead. The useful discharge area is between ~3.6V and 4.1V. After 3.6V they drop off fast.

Don't expect a fixed voltage out of a solar panel.

As always, the data sheet is the only source of information you can rely on.

That said, a Li-Ion cell usually has a nominal voltage of 3.6V. Note that this only a nominal voltage. A fully charged Li-Ion cell is probably about 4.0V or perhaps even more. Fully discharged, maybe about 3.0V.

Good point... they don't list the standard electrode potentials here...

Maybe string together three 1.2V NiMH or NiCd batteries in series? Do you have a voltmeter? Can you measure the voltage your solar panel generates in full sunlight?

Michael

The hardest part of an answer is figuring out the question. Sounds like you're interested in the characteristics of the solar cell???

It's useful to start with the battery voltage, but there are so many solar light topologies that you may be lead astray.

The thing to do is measure the short circuit current and open circuit voltage of the solar cell under full sunlight and the dimmest light where you expect it to work.

The graph lines between those pairs of points are not anywhere near straight, but are similar for many cell technologies and can be looked up. OR you could measure more points along the load line.

You will be disappointed in what you can get out of a solar cell with less than full sun illumination.

Google for MPPT (Maximum Power Point Tracker), but unfortunately, it will not help you too much, if you have too unrealistic expectations.

snipped-for-privacy@downunder.com wrote in news: snipped-for-privacy@4ax.com:

the Samsung prismatic Li-ion cell from a cellphone says on it

p/n EB625152VA fully charged,it will be about 4.2V,IIRC.

other Li-ion cells I have say 3.6V. but that is discharged,as they come off the charger at 4.2V.