wireless internet dish/wind turbine tower [RE-wrenches]

[Tom Simko]

BOB-O,

 Huh... I didn't catch the minus sign, as in positive ground, got it now,
thanks for pointing that little detail out! No, never done telecom before, I
will forge ahead with this assuming all loads will be as you say, from my SW
inverter powering their power supply. I'm still on the hook, waiting to hear
back on the $$ offer. My place is still their best choice last I heard.

Tom Simko
Skyline Solar

on 2/18/03 7:36 AM, Bob-O Schultze, Electron Connection at
econnect at snowcrest.net wrote:

> Tom,
> Dunno if you've ever done a telecom before, but when they say they
> want -48VDC, that's what they mean-as in a positive ground system.
> And THAT, honey, ain't so simple. You can find charge controllers
> that will handle that, but the selection is poor and forget MPPT. Far
> better to supply all the loads from your inverter, keep the system
> grounds separate, and let THEIR power supply sort it out.
> Bob-O
> 
>> Tom Simko wrote:
>> 
>>> Fellow Wrenchs,
>>> Here's the power requirements for the proposed wireless internet provider
>>> dish they want to install on my wind turbine tower, not as bad as I thought
>>> it may be, of course it was sunny AND windy today, 2:00 am December 21 st or
>>> so I may think differently!
>>> 
>>> I plan to make them an offer they can't refuse: that I set them up with an
>>> autonomous PV powered system, with my own home off grid system as a backup.
>>> Also, I will move the proposed site OFF of my wind tower, (and its potential
>>> complications) and about 200' away to an outbuilding, where I already have a
>>> pole with a windsock about 30' high. I will offer to erect a 40' length
>>> (plenty high for their purposes and requirements) of 4" schedule 40 pipe,
>>> bearing on a concrete footer, grounded of course, and secured to the hanger
>>> at about the 25' point, thus no guy wires. This will also allow them free
>>> access anytime without going into or around my shop, and its closer to the
>>> buried phone lines so it'll save them some money. I'll do all the required
>>> work with my own equipment, as its the kind of work I do anyway (although
>>> usually not at my own place, it'll be a short commute)!
>>> 
>>> It appears that a simple 48 VDC PV system, to handle the router loads,
>>> along with a 48 to 12 VDC converter to handle the 12 volts required by the
>>> radio unit, ought to do it. Then again.....It may be simpler to equip my
>>> 24VDC home system with 48 VDC and 12VDC converters, and supply all the power
>>> neeed from my main power center. I'm open to suggestions and comments. My
>>> home system is up to the job, I havn't used a generator for a couple years
>>> now. Below is the wireless ISP'rs requirements.
>>> 
>>> 
>>> "I have looked at equipment that we may install at your location. The
>>> equipment is not finalized yet as to manufacturer so I am giving you what I
>>> would consider maximums at this time.
>>> 
>>> The router (Cisco systems, model 2621) 110VAC @1.5 amps 75w or if I can
>>> get it with a DC power module -38 to -75 VDC, 2.0 amps @75 watts.
>>> Radio unit, 110VAC/DC 12V output 7 watts.
>>> 
>>> Since you are completely green at your site and if these power
>>> requirements exceed what you would want to deal with, and if you have a
>>> neighbor that would be interested in what we discussed, I would be most
>>> pleased to take a call from them."
>>> 
>>> 

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