Super capacitors

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tlinaker1990
 
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Joined: Thu Jun 05, 2014 7:10 am

Super capacitors

Post by tlinaker1990 »

Hi I was wanting to know if I could drip feed a super cap at 3V DC over say a period of 12 hours and then get a steady output ?
thanks :)

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adafruit_support_bill
 
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Joined: Sat Feb 07, 2009 10:11 am

Re: Super capacitors

Post by adafruit_support_bill »

[Moved to General Project Help]

Most super caps, like the one we have in the store are rated for only 2.5v. 3v will damage them https://www.adafruit.com/product/1885
If connected to a voltage source up to 2.5v, they will charge to that level and stay there until you connect a load to it. These are not like batteries and the voltage will drop steadily as it discharges. You can use this page to calculate how long the output will be able to power your load.
http://www.maximintegrated.com/en/desig ... percap.cfm

If have 12 hours to charge up ad you really need a steady output at ~3v, I'd consider using a LiPo cell and LiPo charger: https://www.adafruit.com/search?q=charger
These are nominally 3.7v. You could regulate them back down to 3v if needed.

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