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Ugh, their site is full of popups and accept cookies. None-the-less, looks like a great source, but I notice the don't make pricing obvious. 
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Well, if your "specification" in your OP stands it will dig a serious hole in your wallet.
You get list prices and runtime graphs on this page[^]. I would have probably recommended a 9SX1000 with one or two extra battery modules on that spec. (Sine output and Generator compatible)
But not without making a "cost benefit analysis" beforehand.
Also note that the prices at Newegg are 35-ish percent lower.
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Plus one for Eaton, moved to them from APC and never regretted it.
When it comes round to the time to change batteries, go for the best, Panasonic or Yaesu for example. Cheaper or rebadged ones tend not to enjoy the warm environment inside a UPS and can last only a year.
So old that I did my first coding in octal via switches on a DEC PDP 8
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I've had an APC under my desk for 12 years now. It describes what you're looking for to the letter, except the 3 hour run time. My 1500VA will get me about 20 minutes at a 360W draw.
My first UPS wasn't that large, but its battery lasted about 9 years before I got a warning about the battery failing. The unit still worked flawlessly, but the battery just couldn't hold a change anymore. Keep in mind, the standard on these things is to replace the batteries every 3 years. I decided to upgrade to get more runtime.
To get 3 hours of run time at 300W, you're going to need an enterprise or rack system. Though some home/small business units support extra battery packs, I haven't heard of anything that'll get you 3 hours of capacity.
To get that run time and the specs you laid out, you're looking at something between $2,000-$4,000. You can try APC's configurator to size a system for you here[^].
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I know the title says UPS but if you are intending to power a DC charge like a computer, it might be cheaper, for your given specifications, to replace the AC-DC PSU by a DC-DC one, hook that to a battery, or a pack, and hook those to a battery charger capable of charging the batteries and powering the DC charge at the same time.
This will insulate your charge from any power line misbehaviors. This setup is basically a more efficient Online UPS (I think that is how it is called) because you remove losses from converting AC to DC back to AC in the UPS and then back to DC in your charge, which also extends runtime from the battery.
I do not know how the technology is today for this kind of setup but, some fifteen years ago, we did this in a lab to protect a 100000€ FPGA board from current spikes and over-voltages that were common in the aging building we were in.
Best of luck
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I used a TrippLite UPS a few years ago. Online and true sine wave. It could back up two Windows servers for about 4 hours. I can't remember the model but it wasn't cheap.
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I’ve run APC UPSs for over 25 years - both workstation and server-rack models. I suppose there are better ones out there, but as long as APC works for me, I have no reason to try anything else.
I run a 1500 at home, which is many times greater than needed, but I’m comfortable with that size.
I understand the difference between sine and square waves, but frankly don’t really care as long as the equipment doesn’t cycle or shut down. I guess for some scientific equipment it may make a difference.
You should be sure the UPS can issue a safe shutdown command to the connected computer so as not to surprise the system.
Time is the differentiation of eternity devised by man to measure the passage of human events.
- Manly P. Hall
Mark
Just another cog in the wheel
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I believe the phrase you are looking for is Make before Break.
Effectively the unit has a few seconds of power (like a capacitor), that keeps the circuit going as it switches.
We had a unit installed like this for these very reasons. It was QUITE expensive, but it worked.
It ran our servers, phone systems, etc.
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that's a new term, I always knew those as "Off-line" ie. they don't draw direct power from the utilities as they are allways "off-line" drawing from the batteries being charged at the same time...
but yeah, those are the real expensive ones, especially as you need them to be true pure-sinewaves
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...About all the things I should be doing in my life.
It's an oughtobiography.
I should get my coat and leave.
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it's one of those out to be read as well, will start tomorrow, for sure! 
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When you get a Round Tuit[^]
The less you need, the more you have.
Even a blind squirrel gets a nut...occasionally.
JaxCoder.com
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I have to admit, this took me way too long 
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Damn! I wish I'd thought of that ... Excellent TotD material! 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Please finish it fast.
I'll waste no time reading it. 
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I read his one of the history of glue - I couldn't put it down.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Wow, I'm writing a book about all the furry aquatic critters I've known.
I'm calling it my otterbiography.
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I'm writing a book about linearly independent vectors.
It will be my orthobiography.
GCS d--(d-) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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My mom is having her second cataract surgery (the first was two weeks ago), and I’ve been waiting since 9:40 AM, and it’s now 11:30 AM. The actual surgery only takes a few minutes, but the place doing it overbooks majorly. Ended up going down the road to get breakfast while waiting. Hopefully it doesn’t take too much longer.
EDIT: Ended up finishing around 12:30 PM, and we got home around 1 PM. Mom was in bed until 5 PM fast asleep. Follow up appointment tomorrow at 9:40 AM (again). She's doing well.
What do you get when you cross a joke with a rhetorical question?
The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.
Do questions with multiple question marks annoy you???
modified 27-Sep-21 21:53pm.
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Hope she is well. Stay strong.
I'll be lighting a candle for her.
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Cataract eye surgery is a simple operation.
Doctors could do them eyes closed.
CI/CD = Continuous Impediment/Continuous Despair
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Simple to them 
--edit
The eye isn't a simple organ. And any surgery has risc.
Bastard Programmer from Hell
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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I'm sure it will go well. Best wishes for her swift and complete recovery.
/ravi
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Had cataract surgery in one eye a couple years ago. Had a fancy multi-focal lens installed. Pretty great!
Second surgery is scheduled for next month.
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