I buy the APC BE750G battery backup model. Using it on my Mac Pro with two 27' monitors, it gives me about 12-15 minutes to save my work and shut down gracefully when the power goes out. Using it on my Mac Pro with two 27' monitors, it gives me about 12-15 minutes to save my work and shut down gracefully when the power goes out.
Hello, Sorry for not knowing where to put this, but I'm using this for my Power Mac G5. I bought an APC Battery backup surge protector since the lights flicker sometimes and the APC kicks in to supply the voltage or lack thereof, but I have a problem. The thing beeps me to death. The included PC software does have the ability to turn this beeping off, but Im in an all mac household. I dont think the library would like it if I brought the APC and installed software on their computers to turn off the beep.
That said, does anyone know how to accomplish turning off the beeping just using a mac? There must be some terminal command that can communicate with the APC via USB. Save me from the beeping, Matt Dual G5 with APC backup Mac OS X (10.4.5). Edit: The power actually hasnt gone out yet at all, but the lights flicker alot.
Presumably there is a bad transformer outside (I dont mean Optimus Prime's evil brother) and when there is high demand, it flickers. The lights look like they go to half brightness and flicker about 2-3 times a second. This can go on for several minutes and then stops. I made a new user account in windows 2000 in virtual PC.
I got it past my installation error now it stops installation at 'There is no USB APC 500 Connected' If it's not one thing, it's another. Either the USB support in virtual pc for windows 2000 is lacking or because OSX is using it. I wonder if it would work if OSX was not using it, but the moment I plug it in I get an OSX dialog box, 'An APC 500 has been detected.' Is there a way from stopping OSX from auto-recognizing the APC? Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only.
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I recently converted a basement space into a finished, computer area. Part of the moistuer treatment was hacing a sump pit and two drain channels dug under the floor.
The sump pump in the put activates rarely, but in really moist periods it comes on every 20 mins, for 3-4 seconds, or so. I worry about what would happen if power went out.
Rather than just having a standby generator, could I use a computer batter backup system, like these from APC: ll.or would the load, even tho it only runs 3-4 seconds each time, be too much? It's a small pump - maybe it'd be ok. I'd feel better with one of these and a generator vs. A standby generator alone. :The sump pump in the put activates:rarely, but in really moist periods it comes on every 20 mins, for 3-4:seconds, or so. I worry about what would happen if power went out.:Rather than just having a standby generator, could I use a computer:batter backup system, like these from APC: Yes, generally speaking you can use 'computer' UPSes for other purposes such as pumps. The trick is to size the UPS properly.
There are at least four important considerations in choosing a UPS: 1) Does the UPS do the kind of power cleaning that is important to you. The cheapest variety of UPSes pretty much just pass power through raw until the power fails, and then kick in the battery. There might be some power spike filtering, and there would be some amount of protection against brownouts and blackouts, but you can still end up with some pretty ugly power inbetween those limits. These are called 'standby' UPSes. The kind of UPSes that clean the power up the most are called 'online' or 'double conversion' UPSes, but they are -much- more expensive. There is a third intermediate 'single conversion' kind of UPS. 2) Can the UPS handle the voltage and amperage you need in total?
You can do a worst-case calculation by looking at the specifications of the devices, multiplying voltage by rated amperage and totalling the results over all of the devices, and buying a unit that handles that many VA (Volt-Amps); this will often come out noticably higher than you really need, but extra doesn't hurt other than pricetag. If the UPS is rated in Watts, then you have to be careful in how you do the VA to Watts conversion: there is a phase angle involved in the calculation and the angle is much more favourable for computer equipment than for motors such as pumps: you need a more powerful unit (in Watt terms) to handle motors than you do modern computer equipment that looks to have the same rating.
3) If the UPS goes out, can the UPS handle the drain for as long as you need? In your case, the time the pump would be most needed would be during a storm, but a storm is the time the electricity would be most likely to go out. If you had a really bad storm, could the pump end up running effectively continuously? Take the highest expected load and look through the manufacturer's tables of how long the model could support that load, and figure out whether that's long enough for you. Are you trying to protect against power going out for 5 minutes? 4) How long is the unit going to last? How much is it going to cost to change the batteries a few years down the road the batteries lose their effectiveness over time, depending how far down you draw them, and depending on how exactly they get recharged.
5) Does the UPS have enough of the right kind of outlets for all of your equipment? Examine all the specifications.very. carefully; it's very easy to end up with the wrong kind of receptacles if you don't make a list and check it four times. In the case of your pump, you might find that you need to 'hardwire' the connection - the pump might not.have.
a plug of any sort. If the unit you are looking at does not have exactly the right kind of connections, it is possible that the next one along will. But every once in awhile you find a plug type that a particular manufacturer just doesn't support. Four major UPS manufacturers that I can think of at the moment are APC, Powerware, Tripp-Lite, and Liebart. APC has more than half the market, but I would not say that they are always the best value for your money, and their lower-end equipment does not always last as long as some of the other manufacturers (but you would definitely want to look at APC if you were putting together a '911' call centre or other establishment combining high power with high availability.) There are hundreds of lesser-known UPS manufacturers, some of which produce excellent devices, and others of which don't.
Shopping around can really pay off. But it can also take a long time to decide between multitudes of similar units with similar prices.
Click to expand.An electric motor takes 2 times the running current at start. So if it takes 2A at 120VAC during a normal run. The peak demand on each start is 4A at 120VAC. Therfere you need to rate your UPS for the inrush. Not the normal run. Some people suggest basing at 3x the normal run current or 6A!
Which I feel is actuallly not a bad Idea for a UPS especially if the pump cycles often. Based on the rough numbers of V.A (Volt Amperes) we come out with 6.
120 = 720va. A good UPS for this would be AT least 1400VA. To give plenty of runtime while your Natural Gas or Diesel generator is comming up to speed. (automated transfer switches assumed.) Another idea is to use a trace inverter that works very similar to a UPS without the nice casing. It produces the voltage from the seperate batteries but is charged from the genset or the mains when available, these have the advantages to synchronizing with the frequency of the genset/mains to provide good line control.
These can be powerful enough to run your whole computer system during a bad blackout. From the Desk of the Sysop of: Planet Maca's Opus, a Free open BBS system. Telephone 860-738-7176 300-33.6kbps Telnet://pinkrose.net.dhis.org The New Cnews maintainer B'ichela.
I recently converted a basement space into a finished, computer area. Part of the moistuer treatment was hacing a sump pit and two drain channels dug under the floor. The sump pump in the put activates rarely, but in really moist periods it comes on every 20 mins, for 3-4 seconds, or so. I worry about what would happen if power went out. Rather than just having a standby generator, could I use a computer batter backup system, like these from APC: ll.or would the load, even tho it only runs 3-4 seconds each time, be too much?
It's a small pump - maybe it'd be ok. I'd feel better with one of these and a generator vs. A standby generator alone.
:Based on the rough numbers f V.A (Volt Amperes) we come out with 6. 120 = 720va. A good UPS for:this would be AT least 1400VA. To give plenty of runtime while your:Natural Gas or Diesel generator is comming up to speed.
You have mixed up greater VA capacity with greater runtime for a constant VA. A 1400 VA UPS being run at 720 VA is not necessarily going to run any longer than a 720 VA UPS run at 720 VA. The better manufacturers have runtime charts showing what the expected runtime would be for particular loads.
(It usually isn't exactly a linear relationship, but it's not that far off.) The better UPSes also allow chaining of extension batteries. An 750 VA UPS with a battery might come out cheaper than a 1400 VA.
And would probably drive a 720 VA load a lot longer than a typical 1400 VA unit without extera battery.