1

The UPS is supporting a 180 watt load with a run time of 9 minutes sufficient to allow the servers to shutdown gracefully.

Once power is restored how long do I need the batteries to recover before they can power and protect the load?

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2

Does your UPS not have any type of read out on it to tell you the battery level?

3

It’s usually a couple of hours, but if you’re worried power might go off again during the re-charge, perhaps you need a larger unit that can handle a few outages on a single charge.

@mike-eaton
Probably one for you :slight_smile:

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4

Thanx for tagging me! It depends on how deeply the batteries are discharged. If they’re fully discharged, it’s typically 24-48 hours for a full charge. However, I wasn’t able dig up anything definitive. Most outages are less than a couple of minutes and it shouldn’t take more than a few hours to recharge after a shot outage. Note that there’s a setting to prevent deep discharges–you’ll see it in the manual Eaton 5P UPS - Installation and user manual

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5

9 minutes of runtime on a full charge for servers to “shutdown gracefully” is way under recommended.

You are asking for problems.

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6

Good point but 9 minutes seem to OK but I do need to review what is on the UPS and perhaps split loads which is an option on this model.

Power cuts are rare here but this was for about 3 hours followed by another one about an hour the next day. Short term a few hours is survivable.

7

But 180W seems quite low load for servers ? Even my new Dell 1U server (currently setting up the RAID 5 SSDs) uses like 168W.
Then how about other servers and other appliances like network switches etc ?

Then rather than calculating or even asking (not a pun) as there are several factors that can change charging times…like power input (13A, 16A or 32A), age of UPS and age of batteries.

I would highly recommend to perform the UPS calibration where the UPS will drain and charge up the UPS and also perform some self-tests.

Then I would also plan another UPS for critical networking appliances so that these would outlast the server UPS.