PV Gap

Nathaniel Said:

Would I be allowed to use a travel charger on a plane?

We Answered:

most likley yes, but if i were you i would call the airline and ask, they will tell you everything you need to know. this is the website i always use for getting the correct number. very easy.http://airtravel.about.com/od/basedinnor…

Kathy Said:

please help with circuit diagram........?

We Answered:

you can search in google you may find

if u stil dint get any proper circuit from Google
go and ask the same doubts in this following sites

http://www.electro-tech-online.com/
http://forum.allaboutcircuits.com/showthread.php?t=9538

befor asking u must become a member....

Anthony Said:

Environmentally friendly way of charging a mobile phone. HELP HELP.?

We Answered:

Theres no really environmentally friendly way.
But when your not charging, you can take the charger out of the socket.
That saves energy.
Orrr, you dont have to use your phone/mp3 as much. Therefore, you wont need to charge it as much.

Jimmy Said:

photovoltaic mobile charger help...plz?

We Answered:

skip the 7805. First of all, it needs 7 volts or more to operate, and you are getting 6 volts at the most from the solar cells, more likely about 3 volts. Get a voltmeter and see what the solar cells are supplying. The 6 volts applies only to bright sunlight with the cells are an exact right angle to the sun's rays. And with not much load.

You don't list the current spec of the cells, but it is probably low, perhaps too low to charge your battery.

The next unknown is your battery type and voltage, and how much voltage and current is needed to charge it.

But in any case, you need a voltmeter to see what is happening.

edit
"my phone has an electric charger which gives an output of 5v...I have an voltmeter wth which I checked that the cells gave out 7.93v in bright sunlight and 6v-5.4v in normal...so I tthink the mobile sld start charging with atleast 5v output isn't it?."

It will charge for any voltage over 5 volts IF there is enough current. The cells may put out 6-7 volts, and with any current load, drop below 5 volts. Connect the cells directly to the phone (preferably via a diode) and see what voltage you have then. A diode will prevent the batteries from discharging through the cells if their voltage is lower than that of the batteries.

Another test is to put a load on the cells and see if you still get 6-7 volts. A resistor somewhere around 600 ohms will present a load of around 100 mA.

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