WTB: UPS TRansfer Switch Automatic (makes my switch redundantly power sourced)

[mrkrad]

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[servernewbie]

Hey, I'm a bit new here, not sure if its what your looking for but I have a few APC AP7721 units. Its a rack mountable redundant pdu (no ups), however it will only do 220v (208-230 I think to be exact). If your interested let me know and I can throw a few pictures up.

 

[mrkrad]

208-230 is 3 phase usually except in some datacenters where they pull a leg off and run 208V single phase (rare). I can't use that since i'm at 110V single phase. sorry

 

[sloop]

208-230 is 3 phase usually except in some datacenters where they pull a leg off and run 208V single phase (rare). I can't use that since i'm at 110V single phase. sorry

1 Leg off of 208V 3-phase will give you 120Volt (1 leg of 208V to neutral)

2 Legs off 208V 3-phase will give you 208 volt single phase

 

[servernewbie]

Good information. I was hoping to use one on my workbench at home, but would need it at 110v too. I may take a look in the web interface. Maybe there's a way to enable 110.

 

[mrkrad]

Well it has a measure to fail over (low and high voltage range and phase quality) so i'm guessing this might be difficult


Also earlier design devices required phase sync from both sources.

And some UPS do not work well with modern power supplies so you have to use a pure sine wave current limiting UPS (aka expensive!).

 

[nitrobass24]

How about this? Kinda old, but might just do the trick.
Baytech ATS12 120 Vac 20 Amp Transfer Power Switch | eBay

 

[cactus]

1 Leg off of 208V 3-phase will give you 120Volt (1 leg of 208V to neutral)

2 Legs off 208V 3-phase will give you 208 volt single phase

Can one use 208V rated stuff on 220V split phase? 5% over voltage, but does none BBU power stuff care?