[ARC5] UPS Transformers

[Peter Gottlieb]

Switching power supplies like quasi sine and efficiency is better in the UPS. Cheap units have terrible filtering. The APC units met CE and FCC B. 

The peak starts out at 170 or so and width such that RMS is 120. As the battery runs down the width increases until it's a square wave and then the unit shuts down as it can no longer maintain voltage. 


Peter

> On Nov 19, 2015, at 10:34 PM, mstangelo at comcast.net wrote:
> 
> Check out the SAMLEC PST Series of inverters.
> 
> The cheaper SSW series generate RFI.
> 
> Mike N2MS 
> ----- Original Message -----
> From: Jim Falls <radio-tuber at att.net>
> To: kgordon2006 at frontier.com
> Cc: ARC5 <arc5 at mailman.qth.net>
> Sent: Fri, 20 Nov 2015 02:02:39 -0000 (UTC)
> Subject: Re: [ARC5] UPS Transformers
> 
> Drifting a bit, but can anyone recommend a good modified or true sine wave inverter? Or, is there a site you can point me at?
> 
> Put a "good " one on the scope at a going of business electronics remainderer sale (long time friendly sales rep was pissed he was getting the boot) : modified sine wave was +o-o+o-
> 
> Garbage all over the bands using a service monitor. He pitched it in the e-waste bin. 
> 
> Cheers!
> Jim K6FWT
> 
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