PV Gap

Leona Said:

How many or what kind of solar panel do I need to charge a cell phone?

We Answered:

Cell phone and "small radio" are two different things. Actually, you don't want to charge either one of those things, you want to charge their batteries.

Charging modern batteries is somewhat of a black art. If you want to charge the battery in your cell phone, I would strongly reccomend that you use the charger that came with it. If it came with a "car charger," great! You can use a nominal "12V" solar array to power the charger, and use the charger to charge the phone's battery.

If you just try hooking up solar cells directly to your cell phone, and you don't know the detailed specifications of the phone and its battery, then your likely outcomes range anywhere from "nothing happens" to "the battery catches fire or explodes."

If you google for "solar charger" you will find a variety of ready-made solar products into which you can safely plug your cell phone's car charger.

Joyce Said:

how many panel of solar cell are needed to produce enough electricity to run all house machines and devises?

We Answered:

We need to know a lot more information to answer the first part of the question.

Where you are has a huge effect on the answer because that determines the insolation (the power density of the sun on the ground) and also the cloud cover you are likely to experience. Then you need to know what kind of electrical equipment you have, particularly do you use gas or electricity for heating and cooking. Finally you need to know the efficiency of the solar cells you want to use (a factor of 4 variation can exist between different types)

As for storing the power for night time use, batteries would be the simplest, and most common scheme.

See the sources for a couple of decent discussions