Exactly. But I think he meant that in a 33 day period he only needed 24 hours of sun which comes out to be less than an hour a day. I think his math is flawed (perhaps calculating watts instead of watt hours) but I think that's what he meant. Getting 24 hours of sun in a 33 day period is probably doable even in Seattle but it's the wrong calculation. I think he needs a lot more than 24 hours of sun in a 33 day period.
Greg On Aug 27, 2009, at 1:27 AM, Christopher Erickson wrote: > Could be but that isn't right either. > > 24 hours of daylight is not the same as 24 hours of full current > charging. > > The Sun rises and the Sun sets. > > Latitude and seasons aside, an 80 watt panel is only going to give > about > 450 watt-hours a day at absolute best. > > -Christopher Erickson > > >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless- >> boun...@wispa.org]on >> Behalf Of os10ru...@gmail.com >> Sent: Wednesday, August 26, 2009 10:43 PM >> To: WISPA General List >> Subject: Re: [WISPA] solar site >> >> >> I don't think his 24 hours of sun number meant in one 24 hour period. >> I think he meant 24 hours of sun cumulative over 33 days. No? >> >> Greg >> >> On Aug 27, 2009, at 12:01 AM, Christopher Erickson wrote: >> >>> First, the Sun never shines 24 hours in a day unless you are above >>> the Arctic circle. And even then, that only happens for a few days >>> of the year. >>> >>> Second, there isn't much charging going on when the Sun is near the >>> horizon, which is most of the time when in Northern latitudes. >>> >>> For example, an 80 watt panel will NEVER output 80 watts in >>> Anchorage, >>> Alaska because even at solar noon in the summer, the Sun is only >>> around 60 degrees up in the sky. And below about 25 degrees, there >>> isn't any charging going on at all. >>> >>> So anyway think of an amperage sine wave that builds up in the >>> morning, >>> peaks at solar noon and then diminishes in the afternoon. >>> >>> The math is more complicated than it first appears. >>> >>> "My advice is always free and worth every penny!" >>> >>> -Christopher Erickson >>> Network Design Engineer >>> 5432 E. Northern Lights Blvd., Suite 529 >>> Anchorage, AK 99508 >>> >>> >>> >>>> -----Original Message----- >>>> From: wireless-boun...@wispa.org [mailto:wireless- >>>> boun...@wispa.org]on >>>> Behalf Of Mike >>>> Sent: Wednesday, August 26, 2009 9:06 PM >>>> To: WISPA General List >>>> Subject: Re: [WISPA] solar site >>>> >>>> >>>> I'm not sure I buy into your math. If I have a repeater site >>>> that is >>>> pulling 1A @ 12V, then it is consuming something like 12W, >>>> right? If >>>> I have 60W of solar panel (2 toys) then when conditions are >>>> optimal, >>>> I have 48W left over to charge the battery. >>>> >>>> Lets say I am REALLY north, and the panels are only producing >>>> 45W. I >>>> still am consuming 12W with the radios, and have 33W left over to >>>> charge the battery. If I have an 800AH battery 24 Hours of sun >>>> will >>>> run the radios AND fully charge the battery. If the sun shines 24 >>>> hours out of 33.3 days, I will stay ahead of the curve and the >>>> battery will stay charged. >>>> >>>> No sun for 33.3 days and my 800AH battery will finally die. I >>>> NEVER >>>> see those conditions here in the midwest. I'll still maintain you >>>> can do a repeater site for $500 in solar power costs and if you >>>> monitor battery condition it will work just fine. >>>> >>>> At 09:54 PM 8/26/2009, you wrote: >>>>> Here in the north, I wouldn't bother with anything less than >>>>> 100w of >>>>> panel. >>>> >>>> >>>> >>>> >>>> ---------------------------------------------------------------------- >>>> ---------- >>>> WISPA Wants You! 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