I did some experiments with a battery/solar powered Linksys BEFW11S4 a while back and found that it used about 900mA (or 0.9 Amps) at 12 Volts into a DC-AC power inverter. (Very inefficient - but fit the experiment with entirely off-the-shelf products.)
But these numbers aren't fully accurate either. Ideally, you would run direct DC to the access point. You are right about P = I * E and your assumption of the answer. But as you said, the power capacity of the DC supply is not the actual power *draw* of the access point. -Mike -- Mike Outmesguine TransStellar, Inc. ** Complete Technology Services ** www.TransStellar.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aaron Markham Sent: Tuesday, June 17, 2003 4:21 PM To: [EMAIL PROTECTED] Subject: Re: [SOCALWUG] Low Power AP's using solar > > P.S. - Just curious what kind of overall power > consumption (in Watts) > you seeing for APs? Overall AP power needs should > NOT really be so high that a small solar panel > couldn't handle it. > Well I don't really know power calculations... maybe someone can provide a link for that? I vaguely remember this stuff from school, but now that I actually can use it, I'm not sure how to do it. This is what I've been reading: P = I * E watts = amps * volts ??? so if the AP's power plug says 5V and 2A... 5.0V * 2.0A = 10.0 watts I re-read the plug and I see that the above numbers are the plug's output, so I don't think those are the right numbers to work with. The input is 0.5 amps and 100-120 volts. In that case we're looking at 50-60 watts. I don't like that number cuz now my power requirement just went up 5 fold. Aside from the watts calculations, looking at the solar panels it seems that to get 2 amps (0.5A * 2 AP's = 1 amp plus the extra required to charge up the battery to last all night) you'd need at least a 30 watt panel, but I'm just guessing here. This page has some good power stats: http://www.seslogic.com/solarex.html If anyone can shed some light on this calculation it would be appreciated! Thanks, Aaron
