Using Smart UPS 3000 on 15 amp

[Stephen1R2_apc]

This was originally posted on APC forums on 10/10/2016

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Hello;

My load will be around 600-900 watts -- dual cpu workstation and I would like to have the extra runtime while being not quite so close to the ups load limit as I would be with a sua1500 type. 

Will it blend? -- Even though the load is under the breaker limit will the UPS charging current break the bank so to speak?

-thanks!

[MarkC_apc · Accepted solution]

This was originally posted on APC forums on 10/11/2016

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First, assuming you are in the US (110 VAC nominal outlet).  Somewhat depends on which "3000" you choose.  The newer tech units are more efficient and better power factor so that your 900 watts will draw even less amps from your outlet.  Also, the efficiency drops off in all units as they are loaded less and less.  The charging circuit on the double conversion SURT units in this size range draw 400 watts when batteries are recharged after a failure.  If you use 90% efficiency, 1300 watts total, and the power factor of these units being low  - say .9 then you would draw right at 15 amps using a SURT3000 as an example - might not work.  However if you used a SMX3000 with a 96% efficiency, a .95 PF and assuming the same 400 watts for recharge (Schneider will have to confirm that), the amp draw would be 13 amps - might work.  If your actual VAC at the outlet is closer to 120, then you would even be better off.

Another consideration is that the standard plug on any of the "3000" units will not work on a 15 amp (US) outlet.  You would have to change something which is NOT recommended.

This is not exact, but are some things that need to be considered when installing a UPS.  Usually, if the plug on the UPS does not match your wall outlet - not recommended.  I change plugs on these units - but only for testing and re-install the correct plug before actual use.