I purchased two 630F 2.5V(max) super caps recently. They do not perform the way I expected. I charged my caps at about 1A until they reached about 2.4VDC, so I would not over charge them. I left them overnight, when I check the voltage in the morning they were both at 1.3VDC. I did not expect this loss.
So, I decided to test this in the morning and I charged them again to 2.4V. After charging I placed a voltage meter on one cap, and the voltage starting bleeding off and in about 15 minutes it was down to 2V. This was like a bleeder resistor was on the cap. I had nothing but the meter on the cap and only for a few seconds then removed.
The point is expect this lower steady state voltage after charging of about HALF of the maximum rating. I paid $20 for each cap plus shipping. Also, the 630F capacity is only about 0.6 Watt-Hours, so pretty low capacity.
Super caps should be used with some care, but there are NOT a battery.
Order super caps
build super cap energy storage device Act as a battery, charger, dc to school output, adjustable.
use super cap for flash light power
use super cap to charge sub power pack for cell phone
finance goals retire by 62, have nursing home and life insurance
Build all electronic projects in a modular way and make them plug gable.
use Sparkfun proto board to complete project with a 3D printed case
Here is a RPi weather station that I built. web site
This station has news, tweets, weather, build instructions, forcasts, etc.
Here is a web site with the RPi and Android install.
click here http://www.raspberrypi.org/archives/1700
I have added more features to my tablet. The batteries are in parallel, so the load is shared from the screen and the RPi. A switching 12VDC to 5VDC regulator replaced a very warm LM338 5A linear regulator. The switcher is from a cigarette lighter to USB car charger. It runs very cool in the case. A battery charger was added using a wall wart 12VDC @500mA. I connected an extension cord to the wall wart and fed it outside the case, because I don`t want to carry another charger around like cell phones and iPads have. Just a cord and a wall outlet.
The cigarette lighter plug is active and has a 7.5A fuse just in case. The lighter port can be used in two ways, power supply and 12VDC charger for charging the internal batteries.
Switches have been added for the master power from the batteries to the rest of the tablet, screen power, RPi and USB hub, and internal battery charger. The switches get the user full control of th tablet.
A kick stand.
A cord reel like a vacuum cleaner.
A pair of audio speakers with amplifier.
Here is my Raspberry Pi on a 12.1″ inch touch screen! Very cool screen. Not the clearest screen, but ok.
Here is the body of my new post.
Testing adding another post to the first page.
Blogger here this is my first time blogging. I’m adding this blogging to my web site to test this functionality. I don’t really have a use for blogging to the World! Anyway this seems like a really nice tool to use. The editing seems OK. I’m using Joomla now for content mgt and it seems to have all this same features plus more.
Joomla seems like a better tool to use for blogging. I like Joomla’s PDF download of articles. WordPress does have a comment feature which would allow a comment on each post. That is not in Joomla. Joomla has a easy way to add calendars and events, plus all sorts of other powerful plugins, so that makes it better than this.
I looked at some other people’s blog sites using WordPress and I really do like the comment feature that can be used. Seems like a faster way to get people using the web site. I will continue to investigate this as a use for me.
I’m doing a little editing here to try out some functionality.