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| Thread ID: 62532 | 2005-10-10 22:22:00 | UPS Question | stu161204 (123) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 395168 | 2005-10-11 21:28:00 | You will need a monstrous UPS to get an hour of up-time with that computer, so 5-10 minutes is your most likely result if you stick to reasonable cost and a manageable sized (750 to 1000VA) UPS. Your power problems may not be what you think so check first with your energy supplier for details of local outages, and if they haven't logged any significant incidents it may be your local supply i.e. in your building. If you don't suffer actual outages then any reasonably sized UPS will see you through sags and mini-outages that cause reboots. All you need is time to do an orderly shutdown if the lights go out for longer than a minute or so. If you decide that it is a localised supply issue, I have some expertise in this area (along with others on PF1) so if you don't find any answers PM me for contact details and we can talk it through. Cheers Billy 8-{) Just saw the mention of UPSs not protecting from brown-outs. Any UPS worthy of the name will protect from brown-outs so you needn't worry about that at all. I have one very simple UPS and one somewhat more sophisticated unit. Both carried my systems through the major brown-outs, surges and outages last weekend without problems, and both held up to let me shutdown all computers when it finally went off for good. |
Billy T (70) | ||
| 395169 | 2005-10-11 23:01:00 | Protection from "brownouts" is largely irrelevant these days . This was a very real problem with linear power supplies on mainframe and mini computers . The PDP-8 (linear) power supply would give a power-fail interrupt if the mains dropped to 190V, giving a millisecond to shut down while the DC voltages stayed up . That was plenty of time with core memory . :cool: A switchmode PSU rated to take 100-260VAC input will happily do just that . If the mains drops to 100V, other electrical systems will have had problems first . Electric motors will have lost their smoke if they haven't got protection . A battery UPS is really only to give time for an orderly shut down . You don't know how long the battery reserve will last when you need it . If you need continuous "no break" power, you can have this . . . for enough money . A kilowatt hour of battery amounts to about 100 Ah at 12V . ;) The best systems have an electric motor driving a generator which feeds your computer network . When the power goes off, the cluch engages and starts the diesel . |
Graham L (2) | ||
| 395170 | 2005-10-12 07:19:00 | Protection from "brownouts" is largely irrelevant these days i've got to disagree on that one. with the elcheapo psu's used these days low voltage can cause them to simply fall over or at worse kill them. the good qualty ones will handle drops in voltage most of the time. with a 17" crt or bigger i would recommend nothing less than an 800VA tho a 1000VA would be highly recommended. also one thing to check is they can chew through a few bateries over the years so it pays to check that they use a standard size thats easly obtainable. |
tweak'e (69) | ||
| 395171 | 2005-10-12 07:41:00 | If the power supply is such an issue, then a UPS which will keep going for say 10 mins, and a backup generator for long blackouts? They aren't too expensive for a smallish petrol/diesel generator. | somebody (208) | ||
| 395172 | 2005-10-19 10:48:00 | How do you work out the size UPS you need? I have a Liebert PSA 470-230 In put: 230VAC 50/60 Hz 4A Output: 230VAC 50/60 Hz 470VA/282W It worked fine on my old PC. Now I have a new one and it seemed to work fine for a while (with the new pc, old pc & LCD monitor) but now the battery needs replaced (the unit is 4.5 years old) and I was told that it was not grunty enough for my new (12 month old so hardly new...) pc when I enquired about replacement batteries. Is this true? Or a cunning sales ploy? How do you caculate the power used and back up time? Many thanks Meg |
meg_h_nz (6960) | ||
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