Diy the Best Sunjar in Www.instructables.com :-)

About: A science lover

It is very easy and cheap to diy a sunjar !My circuit can test the sunshine and the leds turn on only at night and turn off while the sun rise again:)

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Step 1: The Circuit Programme

The units can easilly got by electronic pcb junks!

Step 2: Assembling

Now let us see how to make it by one wire one pin,and one wire one pin :)

Step 3: Just Have Fun From Your Sun Jar!

Collect the sunshine and keep it until night to use.

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    49 Discussions

    my panels give out 2.5 to 3 volt at 20ma
    what i have just found is 2 in series wont run this circuit with the components i am using diffent pnp transitor and 1k res insted of 5k

    but if i get another to cells wire them up in series and parallel so i get 5-6volts but 40ma the unit works correctly

    i myself would find out what the trickle charge limit is and have a wind turbine run at that and maybe solar to charge it faster during the day as long as these dont go above what you use they wont be any problems

    then you have nothing to worry about if the battery is 3.6 volts you need to feed it 5-6volts to charge it you need to work out at what ampage to charge it at and for how long

    :)From my observation two solar cell series connection are lower than two solar cell parallel connection then jt to li-ion.
    the solar cell :2*2.4v/65vma

    in series the voltage is higher but ampage (current) is the same
    in parallel the voltage is the same but ampage is higher
    a 3.6 volt battery needs 5 to 6 volts to fully charge same as a 1.2 to 1.5 volt battery needs 2 to 2.5 volts to charge

    From my observation two solar cell series connection to 1.2v battery are still lower than two solar cell parallel connection then jt to li-ion.
    the solar cell :2*2.4v/65vma
    Maybe i should use two solar cell parallel connection to 1.2v battery ,:)

    it will charg but take a very very long time to charge
    i have found if you run a dead bettery that wont take a charge on a joule thief it will then after take a charge

    i have found if you run a dead bettery that wont take a charge on a joule thief it will then after take a charge
    What is it meaning?

    ok you have a battery that reads 0.00 volts or 0.10 volts put that in a wall charger and it will not charge
    but charge it with a jt for an hour then put it in the wall charger it will then charge