Hmmmm.  Note to self.  Build good mounts, but make them so that they 
collapse in high winds instead of breaking.

Thanks for the tip Bill!
marlon

----- Original Message ----- 
From: "Bill Prince" <part...@skylinebroadbandservice.com>
To: "Principal WISPA Member List" <w...@wispa.org>
Cc: "'WISPA General List'" <wireless@wispa.org>; 
<isp-wirel...@isp-wireless.com>
Sent: Tuesday, August 25, 2009 8:21 AM
Subject: Re: [Wisp] [WISPA] solar site


> IMO 24 hours is not enough reserve.  In our area, we have many occasions
> when there is not enough sun for several days running.  I would plan on
> at least 100 hours reserve; more if you are more conservative.
>
> Another issue is storm damage.  Two years ago we lost the panels on a
> solar-powered site because of hurricane-force winds.  One of the panels
> only flew about 100 feet from the tower, and was not damaged
> electrically.  The other panel went 200 yards, and was damaged pretty
> badly.  We put the surviving panel back up in 3 days (we had to build a
> new mount, as the old one was completely destroyed).  Still, the site
> never went down because we built a week reserve into the batteries.
>
> We emergency-ordered a replacement panel, and got it less than a week
> later.  We were able to operate on that one panel for the intervening
> time.  We weren't completely charging the batteries, but there was
> enough reserve to limp along for the time we were down one panel.
>
> YMMV
>
>
> Bill Prince
> Skyline Broadband Service
> (a division of Coastal Sierra)
> 650-917-9279
>
>
>
> Scott Parsons wrote:
>> Hi Marlon, Long time...
>>
>> Voltage 12V
>> Power Consumption: MT 4 watts, 2 Radio cards 8 watts
>> Total= 12 watts @ 12V
>>
>> We have a handy calculator at
>> http://tyconpower.com/learning_center/learning_center.htm
>>
>> I've attached the results. I used 4 hours of sun for your location based 
>> on
>> another post I saw.
>> I used 24 hours extra battery capacity. You may want to increase or 
>> decrease
>> this depending on the reliability of the sun in your area.
>>
>> You need 73 watts minimum solar panel capacity
>> You need at least 88 Ah in battery capacity
>>
>> This is bigger than the stuff we offer right now but here's a starting 
>> list:
>>
>> 1. 85W solar panel - You should be able to get for about $350 or less
>>
>> 2. 12V 8A Solar Controller - You should be able to get for $60 or less
>>
>> 3. 100Ah battery - You don't need a deep discharge type because the solar
>> controller will disconnect the load when the battery voltage reaches 
>> 11.1V
>> which protects the battery from over discharge. You just need a type that
>> has good performance in cold weather. You should be able to pick up a
>> battery for less than $200
>>
>> 4. You'll need a mount for the solar panels try here:
>> http://power-fab.com/products.htm They make all kinds of mounts. I'm not
>> sure the cost.
>>
>> 5. You'll need a vented outdoor enclosure if you are putting the battery
>> inside. I've seen people put the battery in one of those plastic battery
>> cases you see in small power boats and then the enclosure requirements 
>> for
>> the controller and electronics becomes easy. We have suitable enclosures 
>> for
>> $70 14"x10"x5" Polycarbonate outdoor enclosure
>>
>> 6. Wiring is quite simple.
>>
>> Any decent vendor will warranty the panels for 20-25 years and the solar
>> controller for 1 year.
>>
>> Regards,
>> Scott
>>
>>
>> -----Original Message-----
>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
>> Behalf Of Marlon K. Schafer
>> Sent: Monday, August 24, 2009 10:10 PM
>> To: WISPA General List
>> Cc: Principal WISPA Member List; isp-wirel...@isp-wireless.com
>> Subject: [WISPA] solar site
>>
>> Hi All,
>>
>> Sorry for the cross post.  Time is short on this project and I need a lot 
>> of
>>
>> help.
>>
>> I've never done a solar project.  Never really even looked at them due to
>> the costs I've seen tossed about.
>>
>> Now I have a customer that's willing to purchase the initial equipment
>> needed to cover his community.  The ONLY way into the area is a hill 
>> that's
>> within sight of my tower and NOT anywhere near power.
>>
>> I'll be able to just run a single MT board with two radios in it for this
>> site.  One backhaul and 1 distribution.  I'll guess that I'll have less 
>> than
>>
>> a 2 amp draw (probably much less than 1 amp in reality).
>>
>> We don't often get long periods of no sun.  Could be days of fog or low
>> clouds in the winter, but mostly we'll have a lot of sun.  On the foggy 
>> or
>> cloudy days we often don't have enough wind to worry about wind 
>> generation.
>> I think.
>>
>> So, please clue me in on what to buy, who to buy it from (vendors 
>> welcome!)
>> and anything else I'm missing.
>>
>> Thanks all!
>> marlon
>>
>>
>>
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