# what kind of capacitors would i use to store a 12v charge for lights night the solar cell puts out 5.5 v and i need 12?

i have a 5.5v out put solar cell that charges 4 aa batteries for a total of 6 w i need that to be 12v for several 12v led's on a bike so it need to be some what compact

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rickharris8 years ago
Electricity doesn't work like that - If you provide 5 volts that's all the capacitors will ever get up to.
8 years ago
hi,
can anyone help me.

# what kind of capacitors would i use to store a 12v charge for 15 seconds

appolo8 years ago
Just scour the internet for circuits... solar garden lights etc. There are plenty of simple circuits you can experiment with and build to get you started with. Once you've got the basic ideas you can advance to more elaborate projects. Solar panels can be connected to increase voltage outputs (series) or to increase current delivery (parallel) by using a combination you can get the ideal voltage and current for your own needs. I wish you all the best in your quest... Regards
frollard8 years ago
It's easier to change the load to match the source rather than convert the source. As in - change your led lighting to run on 5 volts instead of 12 - then run on 5ish volt batteries. Otherwise - you need to 'boost convert' the output from the solar cells to 12 volts and charge 12 volt batteries. Capacitors would be prohibitively expensive to use in this application.
joshfreegnan (author)  frollard8 years ago
im trying to get into electronics, specifically green energy and just trying to learn how every thing works and how to put it together so it does work. so ur saying the small capacitors arnt what im looking for. how would i increase the output from my solar cell to get to 12 v i have scavenged several 18 wheeler lights from the side of the road that are led and they only work on a 12v system how would i decrease them to 5v
8 years ago
You don't decrease them to 5V, you boost what you have to 12v. Look around for "5V to 12V Boost converters" or "LED drivers"
Something like this can be bought off the shelf.
http://www.ledsupply.com/boostpuck.php
...or you can look to make your own using chips and circuits like this
http://www.national.com/pf/LM/LM2733.html
Steve
8 years ago
...or boost convert the 5 and current control the LEDS
steveastrouk8 years ago
Why not just use batteries ? Your problem is you need to boost 6V up to 12 to run your lights. Have you looked on Ebay for suitable LED driver, or do you want to make your own ? Steve
joshfreegnan (author)  steveastrouk8 years ago
what would i need to make my own driver i am a very hands on type of person
lemonie8 years ago
Capacitors don't store much charge unless they're very big (or expensive).
steveastrouk has suggested a better alternative.

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