this post was submitted on 03 Aug 2024
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https://blog.tripplite.com/pure-sine-wave-vs-modified-sine-wave-explained
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 itβs just a desktop, essentially.
Yes, it should be fine for your use-case. More sensitive equipment would want/need a true sin wave.
Mind giving a few examples for what the more sensitive equipment might be? Really appreciate you answering.
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.
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.