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[aprssig] UPS

John Gleichweit smokeybehr at sbcglobal.net
Wed Dec 27 23:54:38 UTC 2006


I have a couple of small UPSs in use around the house. The 400va unit
that I have powering the headend for the network (dsl modem and
wireless router) uses a single 12V x 7AH battery, similar to the one
that is the battery back-up for the burglar alarm in the house. 

The other one is a 1400VA unit and uses a pair of 12V x 14AH batteries
in series for 24V into the inverter. That's used to power a server
that's online 24/7. 

On Wed, 27 Dec 2006 15:26:16 +1030, Ben Lindner <vk5jfk at activ8.net.au>
wrote:

>The UPS that I checked out and posted the original message about had 
>only 1 12volt/7Ah sealed lead acid in it and was 600va UPS
>
>Ben Lindner
>VK5JFK
>
>Michael Hatzakis, Jr MD wrote:
>> Tapio,
>>
>> <<<It depends. Many, I'd even say most of, today's small and affordable 
>> UPSes (well under 1 kVA) use a single 12 volt sealed lead battery.>>>
>>
>> Thank you, I did not know this, all the larger UPS units I have ever seen
>> use from 24-96 volts DC.  Good info...!
>>
>> Michael  K3mH
>>
>> -----Original Message-----
>> From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
>> On Behalf Of Tapio Sokura
>> Sent: Tuesday, December 26, 2006 5:37 PM
>> To: TAPR APRS Mailing List
>> Subject: Re: [aprssig] UPS
>>
>> Michael Hatzakis, Jr MD wrote:
>>   
>>> I'll try to be helpful here... First, most UPS's do not run on 12v, they
>>>     
>> run
>>   
>>> on 48v for the older and larger units and the newer one's use a lower
>>> voltage, but still much higher than 12v required for TNC's and radios, so
>>> you simply cannot use a UPS to keep batteries charged to run a TNC/Radio
>>>     
>> if
>>   
>>> this is what you were thinking...
>>>     
>>
>> It depends. Many, I'd even say most of, today's small and affordable 
>> UPSes (well under 1 kVA) use a single 12 volt sealed lead battery. 
>> Higher VA versions use several batteries connected in series, for 
>> example I have one under my desk that eats five (60 volts) and another 
>> at work that has eight (96 volts). The bigger you go in kVA, the higher 
>> the voltage, generally.
>>
>> I agree that directly plugging into a UPS's battery for 12 volts for 
>> radios, TNCs, and such isn't necessarily a good idea. Use the UPS for 
>> those devices that need "house current" and use a power supply with a 
>> battery for 12V. Some just use a big sealed lead battery and a smart 
>> battery charger permanently connected together. If you want to spend 
>> some money, the pwrgate works fine as well.
>>
>> If you absolutely have no use for uninterruptible AC, then by all means 
>> use it to power the DC equipment. But keep in mind that many small 
>> off-line UPSes aren't designed to continuously run on/charge batteries. 
>> So if you continuously "steal" 12 volts from the battery, you might fry 
>> something up, especially on a higher load. On-line UPSes always convert 
>> all power going through them to DC, so they should handle continuous DC 
>> loads better.
>>
>>    Tapio
>>
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>>
>>   
>
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-- 
John "Smokey Behr" Gleichweit FF1/EMT, CCNA, MCSE
IPN-CAL023 N6FOG UP Fresno Sub MP183.5 ECV1852
List Owner x6, Moderator x4 CA-OES 51-507
http://smokeybehr.blogspot.com
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