Friday, December 10, 2010 - Leasburg Dam State Park, Radium Springs NM
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Prickly Pear, Leasburg Dam State Park, Radium Springs NM, January 22, 2009
Some thoughts on winter boondocking and power consumption
I've been watching where my power consumption is going. Running off just the battery I can turn things on & off and read the ammeter and see what draws significant power and what does not. It surprised me to find my 15 inch MacBook Pro and the portable hard drive I keep my pictures on are by far the biggest power users in the rig. Here's what I'm finding:
Most everything runs off 12 volts.
- There is about a 0.4 amp drain by the idle systems. ( 10 amp-hours per day)
- LED lights run about 0.2 amps apiece. ( maybe 2-3 amp-hours per day)
- The music system 12v speakers I can't even measure. ( maybe 1 amp-hour per day)
- Everything else - the intermittent stuff like water pump etc takes maybe 1-2 amp-hours per day.
So that's roughly 15 amp-hours per day to run the house.
I don't use much 120vac (at least I didn't think so). The main thing I use it for is to charge the MacBook Pro and, through it, charge the iPod Touch and iPad. And run the portable hard drive.
- The Inverter draws about 0.5 amp at idle. ( 12 amp-hours per day if left on 24/7 )
- The MacBook Pro and portable hard drive draw 2.5 - 3.5 amps almost continuously. ( maybe 70 amp-hours per day if left on 24/7)
- The WiFi router runs about 0.5 amps. ( 12 amp-hours per day if left on 24/7 )
So that's roughly 90-100 amp-hours per day to run the computer and WiFi 24/7.
With the sun low in the sky this time of year I can capture only about 20 amp-hours per day from my solar panels. Deducting the 15 amp-hours per day to run the house from that leaves only about 5 amp-hours per day to run the computer etc. That's good for about an hour and a half of computer & internet time.
I had no idea the computer was such a relative power hog. It's a real challenge to keep them shut down - I'm addicted to the convenience of having them always on and training myself to shut everything down when I walk away is proving to be quite a challenge.
[Update] I added a page to my Lazy Daze Section to expand on this power consumption and it's implications for long term winter boondocking. The new page is over at Winter Boondocking.
Night camp
Site 9 - Leasburg Dam State Park, Radium Springs NM
- Verizon cell phone service - good signal
- Verizon EVDO service - good signal
- Go to Leasburg Dam State Park website
- Locate Leasburg Dam State Park on my Night Camps map
- Check the weather here
Five Trillion Spiders
Spiders begin their hunting with a few handicaps. They're often smaller and weaker than their prey, and they have no wings to give chase in the air. Some species extend their legs by hydraulic pressure, using the same liquid that carries oxygen from their lungs, so they have a hard time running and breathing at the same time. Even their poison may be no match for their victim's: a crab spider's bite is to a honeybee's sting as "an air-gun compared with an elephant rifle," John Crompton wrote. Yet spiders kill at an astonishing pace. One Dutch researcher estimates that there are some five trillion spiders in the Netherlands alone, each of which consumes about a tenth of a gram of meat a day. Were their victims people instead of insects, they would need only three days to eat all sixteen and a half million Dutchmen.
From Spider Woman by Burkhard Bilger, The New Yorker magazine, March 5, 2007, page 69