I was going to mention Xantrex as a contender. They used to be Trace 
Engineering. They make a decent inverter. Tripp Lite makes some special high 
quality high reliability inverters for things like ambulances if you need 
something a cut above. The cream of the crop is the Outback.

Greg
On Sep 20, 2011, at 12:36 PM, Dorn Hetzel wrote:

> I have had good luck with some of my servers using a xantrex inverter/charger 
> and a pile of wal-mart car batteries.  It's not pretty but I have had no 
> power drops in a couple of years.  Since the unit is designed for RVs etc, it 
> will keep the 12v pile charged even in the face of 12v drain, so you can 
> drive both 120vac and 12vdc loads off the same setup.  It will charge the 
> batteries when they need it and ac is available, and float them after they 
> are charged, and use the batteries to provide ac if the mains ac disappears.  
> You decide how big a pile of batteries to attach...
> 
> On Tue, Sep 20, 2011 at 12:59 PM, Patrick D. Nix, Jr 
> <[email protected]> wrote:
> Whatever works best for reasonable $ :-)  it's been a nightmare so far. 
> Starting to upset customers. 
> 
> Sent from my iPhone
> 
> On Sep 20, 2011, at 11:55 AM, "Chris Hudson" <[email protected]> wrote:
> 
>> Is this just while using the Jack? Via POE, 24V is the way to go.. IMO.
>> 
>>  
>> 
>> Do you want to make a full conversion to DC? Or just replace the typical UPS 
>> setup?
>> 
>>  
>> 
>> Chris
>> 
>>  
>> 
>>  
>> 
>> From: [email protected] [mailto:[email protected]] On 
>> Behalf Of Justin Wilson
>> Sent: Tuesday, September 20, 2011 11:52 AM
>> To: WISPA General List
>> Subject: Re: [WISPA] Power for tower sites
>> 
>>  
>> 
>>             Careful on powering most Mikrotiks with 24 volt.  We have found, 
>> and verified with roc-noc and some others, that many of the MT boards will 
>> get hot with 24 volts to the DC jack and lockup and other weirdness.
>> 
>>  
>> 
>>             Justin
>> 
>>  
>> 
>> --
>> 
>> Justin Wilson <[email protected]> 
>> Aol & Yahoo IM: j2sw
>> http://www.mtin.net/blog – xISP News
>> http://www.twitter.com/j2sw – Follow me on Twitter
>> 
>>  
>> 
>> From: "Patrick D. Nix, Jr" <[email protected]>
>> Reply-To: WISPA General List <[email protected]>
>> Date: Tue, 20 Sep 2011 11:45:49 -0500
>> To: WISPA General List <[email protected]>
>> Subject: [WISPA] Power for tower sites
>> 
>>  
>> 
>> Currently we are having some horrible issues with power at our tower sites.  
>> Our current configuration is that we have tripplite smart 500VA rackmout UPS 
>> connected to deep cycle marine battery.  This seems to work OK for a month 
>> or so and then kills either the battery or the UPS or both.  We then notice 
>> that the equipment at the tower will power off (battery shuts down for about 
>> 10 min) and then powers back on.  This happens almost daily and in some 
>> cases multiple times in a day.  I think it may have to do with the output 
>> volts of the battery not being high enough for the UPS to operate.  We are 
>> desperately looking for other alternatives to what we are doing to resolve 
>> this issue.  Most equipment will operate at 12/24 volt.  1x Mikrotik, 2x 
>> Trango AP, 2x Trango Link45, 4x UBNT Rocket.  Any suggestions are 
>> appreciated.
>> 
>>  
>> 
>> Pat
>> 
>> Csweb.net
>> 
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