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Put the word GREEN in that grant app and you might just have a shot!
Not too bad of an idea with those solar panels. Brian Christopher Erickson wrote: The right type of batteries could give you 15 to 20 years of service.And adding a pair of solar panels and an MPPT solar charge controller could increase your backup battery run time from a couple of days to a couple of weeks. And no volatile fuel issues to deal with either. And their PMI interval is a godsend too. And cheaper than a genny. Add another panel or two and you might even be able to drop your grid connection. Remember to eliminate as many power conversions as possible from your telecom power design. -Christopher Erickson Network Design Engineer 5432 E. Northern Lights Blvd., Suite 529 Anchorage, AK 99508 N61?11.710' W149?46.723'-----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org]On Behalf Of Tom DeReggi Sent: Monday, August 03, 2009 10:49 AM To: WISPA General List Subject: Re: [WISPA] Small auto start generator Patrick, In general, sounds like good advice. To clarify our intent, in posting..... >From yr 2000-2008, our model was to.... 1) Have minimum 12 hour run-time of battery for core cell sites. 2) Have contingency plan for hooking up a mobile gasoline powered generator, in longer lasting Emergencies. (We have a couple hot spare generators) Why are we changing our view point? 1) Many of the batteries have now died, and need replaced. Batteries are still very expensive. Propaine Generators have come way down in price (aka Generac) In most case, the generator will be less expensive than the batteries, based on watt load at the sites. 2) Our network has grown, but our staff size has shrunk. We realize the challenge that more than one site can loose power at once, and harder to get to multiple locations at once with generators. Its hard to know when batteries will hold or not, when towards the end of their life, so its always a rush with the genrators. 9/10 cases by the time we get generators onsite, the power gets restored within minutes. 3) Its easy to throw a generator on a Grant Application :-) We believe permanent onsite generators would likely increase uptime, and not necessarilly be more expensive, for some of our sites. (We'd of course still keep some patteries inline) The question is whether it will be more hassle than we realize to re-fill them and inspect them. Some people told me quarterly inspections are needed, or sometimes they do not start when needed. We are already connected to building generators, where we were allowed to, so we are looking at sites where our only option was to put in our own. I'm still uncertain what objections or preferences property management would have for this type stuff. For example, whether they would be concerned about it blowing up if a gas leak occured. I actually have one building in mind wher egetting a new electrical connector from the roof to the ground would be really a big pain. Would require Xray and drilling every floor of 20. There I'd like to put a roof mounted propaine generator. I was thinking maybe the best option is to just have a small external tank, and swap the tank after use? I would think where there is pre-existing riser space, I'd want to mount on ground level, and run thick gauge AC wire up. Mostly I was wondering if management companies look for specific features for the device, or if Generac would offer all standard features to meet the requirements of code and property managers. For our smaller watt sites, we'd of course stick with batteries. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "Patrick Shoemaker" <shoemak...@vectordatasystems.com> To: "WISPA General List" <wireless@wispa.org> Sent: Monday, August 03, 2009 9:07 AM Subject: Re: [WISPA] Small auto start generatorYes, it's possible to get a generator installed on a roof, but it will be an expensive project in our area due to the code compliance issues. However, most commercial buildings will have a preexisting emergency power system for critical loads installed already. There are strict requirements such as sub 10 second startup times, routine testing, and fuel availability requirements. If you talk to the building engineer, you might be able to convince them to allow you a small amount of power from an emergency circuit. The buildings I am in do this for most of their tenants for phone systems, etc. Failing that, have an electrician run conduit to the parking lot and place a power inlet down there. Be sure to have 24 hours of battery capacity, and use a trailer-mounted generator in the parking lot for the rare outage that lasts longer than the batteries. Patrick Shoemaker Vector Data Systems LLC shoemak...@vectordatasystems.com office: (301) 358-1690 x36 http://www.vectordatasystems.com Tom DeReggi wrote: |
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