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The cheaper ones either produce a PWM Square wave or a "stepped" sine - neither of which make APFC PSUs very happy apparently!
The one you show say's is pure sine wave - which means it's the more expensive end.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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OriginalGriff wrote: First you have to work out how much power your kit pulls - which means a meter.
I use my existing UPS for that. 
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It's UPSes all the way down! 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I used a much simpler algorithm.
Set family rule: when power goes out start shutting things down.
Thus: UPS will get you through power blinks, otherwise, save your data and wait things out.
In case you're curious, in theory, the system, w/450 VA UPS, would last 15 minutes)
| Ravings en masse^ |
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| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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I've done quite some UPS's in previous jobs, and the best advise I can give you is to avoid the cheap ones.
Most of the basic setups are just meant to allow you to shut down gracefully, so in general you can count on five minutes on full power. The chemical efficiency in the batteries (lead-acid) are generally quite bad at full power, so you can count on quite a bit more than ten minutes at half power. But there are also units with larger battery packs or extra battery pack as addons.
The most important part of the system is to install a networked control program on all connected units, to make sure you gracefully shut down all connected units, in the right order.
They are generally done having one controller connected to the UPS, and all others are clients connected over the network. This is also where you start noticing a bigger difference between the brands.
My personal preference is Eaton Powerware, they don't charge extra for the control program, which in any case is better than APC's.
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So I'm curious, after googling some UPS's, I can't find any specs on actual amp-hours. Now, in the solar world, all the batteries specify amp-hours, usually assumed with a 20hr rating for usable power (usually that means a voltage of > 10.4V)
Given some of the comments here, like 15 minutes of reserve power, I can only imagine that the amp-hours of these UPS's are really low. Is that the case?
Marc
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Marc Clifton wrote: I can only imagine that the amp-hours of these UPS's are really low. Is that the case?
Usually yes. Cheapo UPS's usually have a couple of pretty much standard 12V/7.2Ah sealed leadacid batteries giving you 170Wh on the paper, but i reality closer to 120Wh
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It's difficult to tell - you get all sorts of different numbers depending on whose site you visit and what bizarre equations they seem to use. And none that I have seen appear to show how you get from "2 * 12V 10Ah batteries" to 2000VA or 1400W let alone how long that would last.
The closest I've come is this:
((Battery Voltage * AH Rating * number of batteries * Efficiency) / VA you need) * 60 = Estimated Run Time in Minutes
How to Select a Battery Backup for Your Computer[^]
But that doesn't explain why two units from the same manufacturer (and using the same batteries) should be rated at different maximum VA or watts since that isn't even included in the equation.
Then you get to the "real world" and a unit the manufacturer says will last 5 minutes is giving some people best part of an hour apparently!
This whole thing makes my head hurt...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I like the hidden part of the maintenance message of CP... Better than the visible...
Quote: Our In-house Deployment and Installation Operation Technicians, with support
from a bunch of Management, Upgrade, Planning and Provider Efficiency
Technologists will get this sorted out proto.
Hardware And Managed System Technicians (Enterprise Ready)
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
modified 25-Sep-16 12:20pm.
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Awesome!!
@Chris, Is it intentional??
Life is a computer program and everyone is the programmer of his own life.
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Just one of those freaky coincidences 
cheers
Chris Maunder
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Chris Maunder wrote: Just one of those freaky coincidences
Sounds like your planning a career in politics.
| Ravings en masse^ |
|---|
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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Quote: Our In-house Deployment and Installation Operation Technicians, with support
from a bunch of Management, Upgrade, Planning and Provider Efficiency
Technologists will get this sorted out proto.
Hardware And Managed System Technicians (Enterprise Ready)
I think you better report this to Homeland, Kornfeld.
«There is a spectrum, from "clearly desirable behaviour," to "possibly dodgy behavior that still makes some sense," to "clearly undesirable behavior." We try to make the latter into warnings or, better, errors. But stuff that is in the middle category you don’t want to restrict unless there is a clear way to work around it.» Eric Lippert, May 14, 2008
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I have no problem with some managers gone... Actually today I would do it myself 
Skipper: We'll fix it.
Alex: Fix it? How you gonna fix this?
Skipper: Grit, spit and a whole lotta duct tape.
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I have 1kg of best neck of lamb to cook tonight.
How?
veni bibi saltavi
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Slowly.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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It's okay, it's dead. It is cut by vertebrae, so it may well prove funions!
veni bibi saltavi
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I am with griff here, slowly, but I always like anchovies studded in lamb when roasting. What's also good is say devoting a joint and stuffing it with mint sauce, well, a few tables spoons of it. Got to be home made mint sauce though, well vinegary, it really cuts into the fat and connective tissue and seems to dissolve it.
Don't know how to apply that to neck though, but perhaps a lab ashore hot pot recipe will be best?
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So, how was it after cooked?
___@sHubHa
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Dont know if this pizza exists, I have never seen it, but the ingredients are a classic combination so I gave it a try and the results were, quite simply, mind blowingly good.
Ingredients:
1 Soft fresh goats cheese, the stuff that in a bit of liquid. http://www.bonniebluefarm.com/images/Sales/06-12-21-Goat-Cheese-PC0800.jpg[^]
2 Honey
3 Walnuts
4 Mint
The goats cheese is very moist, and provides both the base and cheese, so put it on in blobs, sprinkle on cracked walnuts, drizzle with honey, and sprinkle on some, chopped mint. Finish with a drizzle of olive oil. And after cooking, some more mint.
It is incredibly good. Seriously, the best pizza I ever ate. 
(Pistachios would also be good, and you could add a few thin slices of pear too. These are all classic combinations).
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Goat's cheese and honey is a classic combination anyway, so there's no reason why it shouldn;t work as a pizza.
The main thing is to avoid pineapple on any pizza - there will always be someone who insists it is needed... 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Yes, very much a classic combination. Round the mes there are many variants of mint and cheese in pastry parcels fried, and of course nuts and cheese sales too, but try this pizza recipe, it really comes together well, stunningly well in fact.
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"Yummy pizza" is a pleonasm
Pizza is a lot like sex. When it's good, it's really good. When it's bad, it's still pretty good.
Pizza is life.
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