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Looking at 2 Uninterrupted Power Sources, CST1500SUC and CST135UC2. Which should I go for? (self.asklemmy)

submitted 3 months ago* (last edited 3 months ago) by TheGoldenGod to c/[email protected]

28 comments fedilink hide all child comments

Both are on sale at Costco, at the moment.

$109 https://www.cyberpowersystems.com/product/ups/battery-backup/cst135uc2/

$170 https://www.cyberpowersystems.com/product/ups/battery-backup/cst1500suc/

I got a rig with a i9-14900 with a 4070ti Super, but with local brownouts I was hoping either one will cover it. Hoping to go with a cheaper option, but if the group consensus is the more expensive option I’ll go for it. Thanks for the help! 🤞🤞

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[–] [email protected] 6 points 3 months ago (1 children)

https://blog.tripplite.com/pure-sine-wave-vs-modified-sine-wave-explained

[–] TheGoldenGod 7 points 3 months ago (1 children)

Wow, thanks so much for sharing this! It really helps to see it explained.

It sounds like the one for $109 should suffice for my situation then, right? Seeing as it’s just a desktop, essentially.

[–] [email protected] 5 points 3 months ago (1 children)

Yes, it should be fine for your use-case. More sensitive equipment would want/need a true sin wave.

[–] TheGoldenGod 6 points 3 months ago (1 children)

Mind giving a few examples for what the more sensitive equipment might be? Really appreciate you answering.

[–] [email protected] 5 points 3 months ago (1 children)

My understanding is that pure sine is only needed for inductive loads, like motors. If you run a vacuum cleaner with modified sine, it'll sound bad, maybe not work, maybe something will overheat, etc.

Computer power supplies are resistive loads (although reading about it just now it's slightly more complicated than that) and they don't mind the modified sine.

[–] lemming741 5 points 3 months ago

Computers use switch mode power supplies. The first step is a bridge rectifier, they could run on a square wave or ~170vdc. Most have active power factor correction, which chops the incoming current up even more.

Cheap capacitive dropper power supplies won't like a modified sine. Simple motor loads won't either. If you're doing radio frequency work, it will be a huge source of noise but shouldn't damage anything.