UPS sizing for 3850

[Patrick McHenry]

Hi,

never done this before...I need to order a UPS for a 48 port, 3750X PoE switch. The switch has 2, 750Watt power supplies.

Of course, one of the power supplies is redundant so, I only need enough to power to keep the switch and all of it's phones running for 1 hour. Could you tell me what would be an appropriate size for a 48 port, 3750X PoE switch for 1 hour?

Thank you

[Joseph W. Doherty]

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Posting

Actually, depending on your PoE usage, and PoE variant, 750W may not actually be "redundant".

You could size your power based on providing 750W for an hour, your 1500W for an hour, or you usually power usage (examine something like show power inline).

[Patrick McHenry]

I believe 1, 715 will cover our VoIP phones and 2, 37021 APs. Most phones will only be drawing 3.8 watts.

So, to size a CPU for 715 watts for one hour...what size UPS should I be looking at. Or, better yet, when I go to size out a UPS what am I looking for as far as numbers?

Thank you

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

A UPS, then, that can supply 700 W, for an hour.  UPS vendor literature should be able to describe.

For example, in APC literature, you would be looking at about a 5000VA UPS, possible one with extended battery capacity.