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Is Maxgreen online UPS any good?

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The seller suggested me to get
"MaxGreen MGO-W1KS 1KVA Standard Backup Online UPS"
He also mentioned 2 and 3 KVA UPS but I guess 1KVA is enough for my desktop

I've very limited choice here, So my question is, Is this UPS any good?
 

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i've never heard of the brand, but it's a pure sine wave so i guess that's good.

 

as for how much power... KVA ratings are vague as heck, it has to do with the reactive power blabla whatever, but the actual wattage the units can push is usually around half of that, so around 500W for the 1kva model. another thing to add is that the closer to the limit you are, the shorter your batterly life will be (and the harder you hit the battery, and the quicker you have to replace them..)

 

my own desktop is plugged into a 1400VA APC BackUPS, and i never really overload things, but at peak i *am* limited to just minutes of battery life on a fresh battery, even less on a battered 3 year old battery. geenrally on these little desktop units i recommend that if you expect any battery life at all beyond "shut down ASAP" you should never go over max load, so 250W actual load for every KVA.

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I've seen and opened similar models and no, they're terrible.

 

On 5/17/2022 at 8:22 PM, manikyath said:

i've never heard of the brand, but it's a pure sine wave so i guess that's good.

Do you really believe that? I did a quick search and they claim it has a .9pF... like, only top of the line Schneider products have such and those cost over $5000 with Li batteries and stuff, this one has a moped battery inside.

It's closer to the .5 you mention in reality. And definitely not a pure sine-wave.

 

I've made a series of... unfortunate experiments on my little victims -similar models- and they all fail under a resistive load (a string of light bulbs), the AVR circuitry takes it as a short and tries to mitigate it, most of the times there's only a 6 or 10 amp fuse to protect the whole thing so it'll never burn regardless of the load, as it filters the load the transformer gets insanely hot and basically deep fries itself and the windings short out, same for the battery but I haven't seen one explode yet. The sinewave is so dirty you can actually see it on the bulbs as flickering. Like a scope, but cheaper.

 

I can usually repair or repurpose these things so it's not a big deal when they fail, most end up as AVRs or simple surge protectors that go for $5 with clear warnings that they're NOT battery backups.

Tender is the night

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