Good information.... http://www.solar4power.com/solar-power-sizing.html
----- Original Message ----- From: "Mike Hammett" <wispawirel...@ics-il.net> To: "WISPA General List" <wireless@wispa.org> Sent: Thursday, August 27, 2009 9:55 AM Subject: Re: [WISPA] solar site >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/
