I want to use 20 led's with 3.6v and 20 milli amp current. what is the best suitable solar pannel with specs.

Question:

I want to use 20 led's in parallel circuit, and want to use solar pannel for power, so that it can charge the charger in the day light and in the night it can glow for about 8 to 10 hours. please tell me if there is any kit available or i can get different parts and put them togather. size really matters in this case, smaller is better.
i appreciate every bit of help.
thanks in advance.

Answer:
Total energy needed

= 10hr x 20 leds x 3.6v x 0.020 Amp
= 14 watt-hr.

So the 3.6 volt battery should be atleast 3.8 AmpHr capacity.

Usually solar panels are made for 12 volt batteries. You can connect a 12 solar panel to 3.6 volts but you may over charge the battery. Even if you connect a 12 volt panel to 3.6 volt battery the panel will give you almost same current.

In short look for a panel with short-circuit current of

14 watt hr / 6 day light hr / 3.6 volts = more than 650 milli Amps.

It is going to be more complicated than what you think. You will have to use a diode so that your battery is not discharged during night via panel itself. Also you will need a power-zener diode of about 4 volts , in parallel to battery so that battery is not over charged.

Try ebay , you can find panel + battery combo easly that will give you 4.8 Volt. If you want to have fun try my idea.

I want to use 20 led's with 3.6v and 20 milli amp current. what is the best suitable solar pannel with specs.

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