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5V UPS for Raspberry Pi: Difference between revisions
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== Classic UPS == | |||
[[File:Classic-ups.jpg|200px|thumb|Classic 230V off-line UPS]] | |||
Using classic widely available UPS from any computer shop for back-up power for your Raspberry Pi might seem as a pretty good idea. Until you find out problems assigned with these cheap off-line UPS. One of the main problem is that some models last 50 minutes maximum (no matter how much battery is charged, it will power off after certain time amount). Second problem comes with double voltage conversion. Normally UPS use built-in 12V battery which is converted to 230V AC voltage (if you have UPS under low load there will be pretty high lost) and then 230V AC is converted with your Raspberry Pi adapter to 5V DC. So there are two conversions, time limit and most importantly cheaper UPS do not allow you to measure battery voltage (you may buy more expansive one and connect it to your Raspberry Pi with USB UART convertor. Considering these facts I do not recommend classic computer UPS | |||
=== Advantages of classic UPS === | |||
* extremely easy to buy | |||
* easy to connect and get working | |||
=== Disadvantages of classic UPS === | |||
* usually time limit | |||
* high power lost due to double conversion | |||
* no battery measurement in basic models | |||
== Powerbanks == | == Powerbanks == | ||
[[File:Powerbank.jpg|200px|thumb|Xiaomi PowerBank 10,000mAh]] | [[File:Powerbank.jpg|200px|thumb|Xiaomi PowerBank 10,000mAh]] | ||