1500VA (900W) UPS not able to handle (only) 4 Cisco access switches?

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rlakhani11

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Aug 8, 2013
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Hi,

As per the title, I have 2x 3550s (65W), a 3750-24PS (57W - data only) and a 3560-24PS (43W - data only). The wattage numbers mirror the switches' respective datasheets and depict the maximum/rated usage.

I've charged the UPS (internal battery) for good 12 to 15 hours now and according to the suppliers confirmation, this UPS should provide a minimum of 3 minutes backup on full load (and as long as ~20 minutes based on the load). The switches are being consoled through an AMD Opteron PC (250W max) with an ASUS LED (<22W max).

The question is, why this 900W UPS immediately gets overloaded and turns off immediately, with both the PC and switches far from consuming their maximum rated power. The wall outlet draws ~0.8A total for the switches and ~0.9A for the PC on ~220V, which makes it a meager ~176W for switches and ~198W for PC respectively.

Appreciate your time and help.


Thanks very much.


EDIT: It's an Intex 1500VA (900W) UPS. And the ugliest thing is that I've already gotten it replaced once. This one also behaving the same way!
 
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rlakhani11

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Aug 8, 2013
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First of all thanks.

Can you please suggest a way to test this? Bcoz the battery could definitely be blamed, as the previous UPS (that I returned) was flapping between battery (backup) and AC/grid (normal/charging) every now and then, without any voltage drops below its operational range of ~145V (the normal AC voltage range here is ~170V to ~240V).

The day I returned it, it ran completely on battery between 15-60 seconds twice, without any power outages or voltage drops! So this model's battery might indeed be bad.
 
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rlakhani11

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Aug 8, 2013
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Firstly, thanks very much for the help man.

So, the UPS turned out to be "very bad" in its entirety! Only if I had just glimpsed their website before making this purchase, it could definitely have given me a strong verdict about the company itself, which as expected, is a sub-standard/low-grade/cheap manufacturing company. Ironically, this 1500VA UPS does not even exist on their website and support page returns errors constantly so that no one can contact them regarding their ugly products!

Anyway, this Intex 1500VA UPS is pathetic for these reasons:
1. Voltage Range (~145V to ~300V): False claim! The UPS immediately switches to battery mode as soon as the voltage drops below ~180.

2. AVR: False claim! As mentioned above, it does not regulate the voltage as advertised and turns to battery mode randomly/inappropriately.

3. Quoted from a document from Schneider Electric:
"It is a de-facto standard in the industry that the watt rating is approximately 60% of the VA rating for small UPS systems, this being the typical power factor of common personal computer loads. For small UPS designed for computer loads, it is appropriate to assume that the watt rating of the UPS is 60% of the published VA rating."

Apparently that's why they haven't given any information regarding the UPS's power factor on the box or on the booklet that comes with it (unlike other better/good brands), bcoz this 1500VA UPS has a mere ~0.4 (40%) efficiency, meaning its batteries shall not bear more than ~600W, implying that it is manufactured below the level of industry norms.

4. Backup Time (3-20 minutes based on load): False claim! The supplier confirmed that the minimum backup time of 3 minutes must imply the full load (or approximately full load) condition. Whereas, on its below-standard 600W so-called "full-load", it gives the backup of ~1 minute. Now that's PATHETIC!!! The supplier also informed me that Intex UPSs have extremely low-quality batteries (the 650VA battery costing only around $10!).

My personal verdict/opinion: Strictly do not recommend Intex!!! It's "apparently" a typical asian thief company cheating people big-time by providing false information about their products!
 
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