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  Reply # 195237 11-Feb-2009 06:18
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True, but they do not start automagically. Anyway I bought 2 1000VA UPSes without batteries off TradeMe and a friend of ours works at Exide so I will be getting two 150ah batteries in a few days time... Laughing

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  Reply # 195367 11-Feb-2009 18:17
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chrisjunkie: True, but they do not start automagically. Anyway I bought 2 1000VA UPSes without batteries off TradeMe and a friend of ours works at Exide so I will be getting two 150ah batteries in a few days time... Laughing

that is not quite true, depending on the type, you can get them wired up to do an auto start when a power loss is detected.



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  Reply # 195370 11-Feb-2009 18:19
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Johnk:
chrisjunkie: True, but they do not start automagically. Anyway I bought 2 1000VA UPSes without batteries off TradeMe and a friend of ours works at Exide so I will be getting two 150ah batteries in a few days time... Laughing

that is not quite true, depending on the type, you can get them wired up to do an auto start when a power loss is detected.


What I meant to say was simultaneously... as to not let the servers go down in the first place :)

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  Reply # 195386 11-Feb-2009 20:01
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chrisjunkie:
Johnk:
chrisjunkie: True, but they do not start automagically. Anyway I bought 2 1000VA UPSes without batteries off TradeMe and a friend of ours works at Exide so I will be getting two 150ah batteries in a few days time... Laughing

that is not quite true, depending on the type, you can get them wired up to do an auto start when a power loss is detected.


What I meant to say was simultaneously... as to not let the servers go down in the first place :)


typically you have UPS's *and* a generator.  In that scenario the UPS only has to hold the fort for a short time until the generator kicks in.

Not sure how easy it is to hook a 'cheap petrol generator' up so that it would automatically start and feed power where you need it though.

We have a diesel generator the size of a shipping container parked out the back of our building.  It took less than 20 seconds to cut over to the generator and then less than 10 seconds to cut back to the grid power in the recent outage.  During both operations the building loses all power so the UPS has to kick in to keep things up.  When you only have <30 second outages you can load your UPS up to max kVA and not have to worry about the shorter runtime.  If, for some reason, the generator fails to kick in I have confiured the UPS to shut down all non-essential services after the first 10 minutes.  The 30 minute runtime at full load then extends to over an hour for the remaining services as the UPS is only running at 35% of rated kVA.




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