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Battery capacities for a UPS, anyone?

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Freddyfruitba...
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PostPosted: 11:56 - 22 Oct 2018    Post subject: Battery capacities for a UPS, anyone? Reply with quote
I have a Uninterruptible Power Supply for my computer equipment, and unfortunately today it started screaming at me that its battery had failed so I'm trying to source a replacement. Does anybody know anything about this stuff?

The device is an APS Back-UPS ES 550. The manual is here, and says that its battery capacity is 550VA/330W.

I've found a replacement battery at https://www.tayna.co.uk/ups-batteries/powerline/pu7/; which looks spot on; however it describes the capacity as 7 Ah. My tiny and ageing brain is struggling to work out if this is consistent - I'm trying to remember my O-level physics and equating 7 amp-hours with 330 watts (joules/second). Does that make any sense? Aren't these fundamentally different quantities?

Can anyone shed any light as to whether this is the correct battery for me?
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colink98
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Joined: 27 Jun 2016
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PostPosted: 14:21 - 22 Oct 2018    Post subject: Reply with quote
this one is listed as a direct replacement
https://batteryclerk.co.uk/products/apc-backups-es-550-12v-7ah-ups-battery?gclid=EAIaIQobChMIu9XY0Z6a3gIVw7ztCh249QSbEAYYBCABEgKdbfD_BwE

its just a 12v battery.
the one you link is going to be the same.

it also looks very similar to the generic type that is used in alarm systems etc.
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Freddyfruitba...
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PostPosted: 14:51 - 22 Oct 2018    Post subject: Reply with quote
ColinK98 wrote:
this one is listed as a direct replacement

Thanks - looks good: indeed, that one's a 7 Ah one like the Tanya item I found.

So what's the deal with the watts / Ah thing then, out of interest?
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colink98
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PostPosted: 15:08 - 23 Oct 2018    Post subject: Reply with quote
Freddyfruitbat wrote:
So what's the deal with the watts / Ah thing then, out of interest?


its a measure of how much power the battery can put out.
so a 7ah battery should be able to put out 1 Amp for 7 hours ?

So for example a light bulb might draw 0.5 of an Amp.
so your battery should be able to keep the light bulb live for 14 hours.

a quick google suggests a desktop will draw 3 amps so your battery might keep that alive for 2+ hours.
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Freddyfruitba...
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PostPosted: 17:02 - 23 Oct 2018    Post subject: Reply with quote
ColinK98 wrote:
Freddyfruitbat wrote:
So what's the deal with the watts / Ah thing then, out of interest?
its a measure of how much power the battery can put out. so a 7ah battery should be able to put out 1 Amp for 7 hours

Thanks - yeah, I get that bit; it was really how to equate what are apparently two different measures of capacity - Ah and VA?
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