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[aprssig] UPS

Ben Lindner vk5jfk at activ8.net.au
Wed Dec 27 04:56:16 UTC 2006


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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