EEVblog® Electronics Community Forum
Electronics => Power/Renewable Energy/EV's => Topic started by: eeguy on January 16, 2025, 10:33:41 pm
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Hello, I am looking for light weight and small UPS from reliable brand that can generate pure sine wave to power mini PC. Please recommend products. Thank you
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You didn't specify any actual requirements but does 63.5 x 28.4 x 42cm and 3600 Wh do it for you? Might keep a mini PC going for 2 days. The big problem with most UPS is their self-consumption, which in this case is about 50W, possibly as much or more as the PC itself, depending on monitor etc.
https://ecoflowtech.co.nz/products/ecoflow-delta-pro
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Light weight (less than 1kg) is the top priority. The rest are flexible.
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What are the voltage requirements of the mini PC after the power supply? Is it like most computers with 12v, 5v and 3.3v, or is it a single supply voltage to the computer board? Are there control signals from the PC to the power supply?
The reason I ask is because this may be something you can do with a battery and a series diode instead of buying something pre-made. For example, if the mini PC only requires a single 12v source, maybe you could use a 12.65v lead acid battery with a series diode dropping it to 12v. As long as the power supply is supplying power, the battery is disconnected as the diode will not be forward biased, but once the supply cuts out, the diode will immediately conduct allowing the battery to take over. The PC would see a slight drop in voltage, but it shouldn't be enough to cause issues (in this example).
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Most mini PCs are either 12V or 20V, 12V matches up well with 3S lithium ion and 20V with 5S lithium ion.
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I'd use a USB powerbank suitable for laptops.