Monday, February 18, 2008

Various Updates

1) The rechargeable battery in the digital camera experiment came to an abrupt end. The camera just doesn't like those batteries. I got about 20 photos before the low battery light came on. Not as bad as the cheap battery experiment, however. You know the ones, you get them in packs of 100 for $12? Four flash pictures before the camera failed to function properly. Smooth!

1b) So I'm transitioning the rechargeables to more mundane uses, like remote controls and my work pager. So far so good. I think that's probably their natural role, in low drain devices that are relatively near the charger. The pager eats a regular Duracell in about a month. That should recoup the cost of the rechargeable in under a year. Then, profit.

2) Did you know Flickr has rss feeds? Had no idea. Efficiency!

3) I spent most of yesterday relearning the rules of DC electricity. I was trying to do a load test on a battery for a UPS (Absorbed Glass Mat Lead Acid). More ridiculously, I was trying to figure out what the wattage of a 100W 120VAC lightbulb would be when hooked up to a 12 VDC battery. I gave up and went and bought a headlight for a 1979 Dodge Magnum. $8 and I know it is 55W @ 12 VDC.

3b) I wanted to do this because I just don't understand batteries. I have an RBC11 battery back for a SUA2200RMXLNET UPS. It consists of four 12V batteries hooked up in series. It measures out at the expected voltage. But just wouldn't support a load when in the UPS. Turns out, if one of the batteries fails, the whole string goes bad. More enragingly, each 12V battery (even your car battery) consists of 6 2V cells in series. That means if ONE cell goes bad, the whole thing goes kaput.

3c) I demand an investigation.


At Monday, February 18, 2008 9:51:00 PM CST, Blogger cljo said...

I've had your Flickr account on an RSS feed for over a year. Post some damn pictures.

At Tuesday, February 19, 2008 8:05:00 AM CST, Blogger gc said...

I have about 3 flickr accounts accidentally. That's on the list for rectification.


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