I like the sine wave output. While cutting it a little close for the current I don't see a problem because as you mention, you don't plan an extended run using it but rather a nice controlled shutdown. While far from inexpensive I see it as a good investment. I run several lesser units and their only purpose is to maintain things for about 10 seconds till my backup is online.
Ron
Well I'm not sure if my calculations are correct? That is to say the load limit 25amps is distributed across 3 Surge Plugs, at 8.3amps per outlet. From some previous documentation I read on UPS that's what it seemed their are 3 different supply windings. It should be like that all of them I'm pretty sure at least?
Hi
The spec says:
Built-in UPS output receptacles:8 5-15/20R outlet(s); 1 L5-30R outlet(s)
Built-in controllable switched load banks:Two switchable single-outlet load banks
Output circuit breaker:Two 20A output breakers protect 4 5-15/20R outlets each
So there are 2 groups of 4 receptacles, including one that is switched.
3000VA is the total capacity of the UPS. So you can use any combination of outlets as long as the total load doesn't exceed 3000VA.
However, since the outlets are divided between two 20A breakers (4 outlets each), you have to consider that when connecting equipment.
As a guideline, if you divide the load evenly, then you can connect up to 12.5A per group of 4 outlets.
So with the numbers you listed:
Out 1 = 7.75a
Out 2 = 8.3a
Out 3= 7.29
You'll be able to connect any two to one outlet group, and the third to the other outlet group.
Hope I didn't confuse you...
Other than that, I think its a nice UPS...
eT
KV:
You MIGHT have a problem. VA is not watts.
Note this spec: 2.25 kW, 3000 VA
You have 2250 W to deal with, not 3000 W. So a resistive load is 2250 W and an inductive load is 3000 VA.
So, 2250/120 = 18.75 AMPs
So, you really need Power Factor numbers for what your going to back up.
I would not invest in that UPS until, I measured what I had to back-up. Spring for about $20.00 http://www.p3international.com/products/p4400.html first.
I have two UPS's at home. Both "broken" which meant, they need new batteries. One is a about a 500 VA Tripp-lite. If the batteries die the UPS dies.
The UPS won't even start. Not 100% sure what the APC does. One UPS does the cordless phone, ans machine, PERS alarm and a small light because of moms mobility issues. So, the high intensity lamp works and thus you can find the flashlight if you had too and we don;t lose the time on the ans. machine.
The other, at home does "most" of my network stuff.
The only UPS I had to select was one where there would be a transition from utility/generator to UPS. Not all UPS's will work with a generator. That was my management issue. Why did we need this "more expensive" UPS?
In any event the NEC will not allow a "continuous" circuit to be loaded more than 80%. So, that's why you have to feed it with a 30 A 120 V circuit.
The 20 A receptacle can only "support" 80% of 20 A continuously, so that is the max load on the receptacle.
There is a lot more to this VA thing that meets the eye. Motors/inductances require V*A to start, because A is the start-up current and the UPS has to be able to supply that. It's entirely likely that 3000 W cannot be supported continuously. Guess on my part.
I'd measure before investing. Not sure if that version of the kill-a-watt is capable of measuring start-up VA.
Now, I have 2 groups, one is on the Surge protected side and the other is on the Battery side, with one outlet that can go either way, but in this case not important.
kv
In an "always-on" topology, I think you get:
1. mains charge battery
2. Battery provides power to Class D-amp
Hence, if battery fails - no UPS.
Mission critical may require battery Hot swap and say an SNMP enabled UPS. I'll just throw something out without reading it all: https://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=AP9630&tab=features
In the low-end market, the ups might be $80 and the battery $35 to $40 with shipping. In my case, I don't care about 24/7/365. I'd probably get 24/7/365*3-(2 weeks). So, battery fails. UPS starts beeping. You transfer to non-backed up outlets hopefully and for 1-2 weeks your not covered 24/7 until battery arrives.
That, I think, is your biggest gotcha. What happens when the battery dies?
The second gotcha, is how do you monitor the batteries?
This is the User Manual, I hadn't thought to pull it off the net and look at it. This thing is a really nice unit for the Price...https://www.tripplite.com/shared/product-pages/en/SMART3000RM2U.pdf
Now my problem is that 9th switchable outlet that you describe can be turned off or on, is it on either of the 2 banks or is it independent, and if independent does it share full load capability, meaning all 25amps?
If not, I guess? it could be on either of the 2 banks, depending on the configuration.
There is one switched outlet in each group and it shares the total UPS load capacity.
There are only 2 groups of 4 outlets (3 unswitched + 1 switched) and they all share the total load capacity. So there are 8 total outlets. Each group is protected by a breaker, so each group is further limited by the breaker capacity.
The switched outlet is only independent in that it can be switched on/off without interrupting the other outlets .
eT
So, the load capacity is shared by all, with the limit being the circuit breakers and how many devices per bank of the outlets.
The single outlet can be on/off is it likely to be on one or the other breakers, Or is it's totally independent with no circuit breaker interrupt?
What I initially see is that your missing the "switched outlet(s)" which was probably there to "Re-boot" servers remotely by turning off the power.
Good Catch, I really just need to be notified in the event of a power failure e.g. to go and > restart.
Thanks,
kv
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