ampere

[anikn08]

i am trying to make a mobile phone battery charger from a solar cell. but the Isc of Solar cell is about 87mA. nd Voc is 6.7V. now, if the batter requires more current, than this, wil it still get charged if i connect it whd d solar cell?? and what affect does it cause if we connect a component which require more current than the connected source. plz reply soon. bta

 

[colin55]

The item only gets the maximum current that the supplying device can supply.

 

[crutschow]

It will still charge the battery, but it may take a long time to fully charge.

 

[audioguru]

The current from the solar panel is 87mA only when it is shorted and probably only at noon. The current is less in the morning and in the late afternoon and evening. Um, the current is zero at night and nearly zero on cloudy days.
When the solar panel charges a battery then it is not shorted so its current will be less.

If you use a low current to charge a battery then the charging time will be longer.

 

[anikn08]

thanks for d replies. so it wil only charge the battery in more time. wil it affect the battery in some or the other ways??? and is there any way by which i can increase the current from the solar panel???

 

[audioguru]

If the battery is a lithium type and you over-charge it then it might catch on fire. But maybe the charging and protection circuits are inside the phone.

You can increase the current from the solar panel by placing it closer to the sun, maybe on the planet Murcury. Or use a bigger solar panel.

 

[anikn08]

cant we use any feedback type current amplifier??

 

[mneary]

cant we use any feedback type current amplifier??

To increase current, you need more energy input. Nothing is free.