Alan, I have measured 40ma current with the tester probes between the solar
cell and the battery pack, but  the batteries were not full charge: however
I will execute the test suggested and using the diode.

Thanks
Marco



----- Original Message -----
From: "Alan B. Pearce" <A.B.Pearce@RL.AC.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 28 febbraio, 2002 12.46
Subject: Re: [EE]: mini solar charging system


> >tested with a small  (1" x 3") solar cell from a toy and I have
> >measured about 40 milliamp. out in direct sunlight.
>
> Is this just by putting a current meter on the solar cell, so you are
> measuring short circuit current? The current will then be less when
charging
> a battery.
>
> See what the actual current is when using a resistor as a load, such that
> the voltage across the resistor matches the battery voltage. You may need
to
> include a low voltage drop diode in the circuit as well.
>
> --
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>
>

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