I think that's why they developed the sun hour maps I referenced earlier. They just tell you what to expect in your area for sun hours a day.
----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------- From: "Christopher Erickson" <christopher.k.erick...@gmail.com> Sent: Thursday, August 27, 2009 12:57 AM To: "WISPA General List" <wireless@wispa.org> Subject: Re: [WISPA] solar site > 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! Join today! >> >> http://signup.wispa.org/ >> >> ---------------------------------------------------------------------- >> >> ---------- >> >> >> >> WISPA Wireless List: wireless@wispa.org >> >> >> >> Subscribe/Unsubscribe: >> >> http://lists.wispa.org/mailman/listinfo/wireless >> >> >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > >> > >> > >> ---------------------------------------------------------------------- >> ---------- >> > WISPA Wants You! Join today! >> > http://signup.wispa.org/ >> > >> ---------------------------------------------------------------------- >> ---------- >> > >> > WISPA Wireless List: wireless@wispa.org >> > >> > Subscribe/Unsubscribe: >> > http://lists.wispa.org/mailman/listinfo/wireless >> > >> > Archives: http://lists.wispa.org/pipermail/wireless/ >> >> >> >> ---------------------------------------------------------------------- >> ---------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> ---------------------------------------------------------------------- >> ---------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
