5V UPS for Raspberry Pi: Difference between revisions
Created page with "== Why not to use Powerbanks == 200px|thumb|Xiaomi PowerBank 10,000mAh" |
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== Why not to use Powerbanks == | == Why not to use Powerbanks == | ||
[[File:Powerbank.jpg|200px|thumb|Xiaomi PowerBank 10,000mAh]] | [[File:Powerbank.jpg|200px|thumb|Xiaomi PowerBank 10,000mAh]] | ||
Using power banks as a cheap UPS might seems as good idea because they are widely available and more expensive ones (around 20USD) provide enough power not only for Raspberry Pi but also for tablets and other devices. Main issue with power banks (I tried Xiaomi MI 10,000 mAh) is that they contain just one DC-DC power converter so you can either charge them or discharge them. With my power bank '''when I disconnected power supply power bank suddenly resetted and stopped providing power for nearly 5 seconds''' so my Raspberry Pi went down. Not only that. I was suspicious that when powering output power bank was not charging itself properly. | |||
Also there is an issue with capacity. Capacity 10,000mAh means capacity of LiPol 3.7Volts battery inside power bank. After DC-DC converting you will get capacity around half - 5,000mAh for 5Volts output. If your RPi is just with all accessories is just taking out 500mA per hour this power bank will last for 10 hours maximum which is not in all scenarios (e.g. security, automation systems) enough. | |||
Revision as of 18:43, 13 September 2014
Why not to use Powerbanks
Using power banks as a cheap UPS might seems as good idea because they are widely available and more expensive ones (around 20USD) provide enough power not only for Raspberry Pi but also for tablets and other devices. Main issue with power banks (I tried Xiaomi MI 10,000 mAh) is that they contain just one DC-DC power converter so you can either charge them or discharge them. With my power bank when I disconnected power supply power bank suddenly resetted and stopped providing power for nearly 5 seconds so my Raspberry Pi went down. Not only that. I was suspicious that when powering output power bank was not charging itself properly.
Also there is an issue with capacity. Capacity 10,000mAh means capacity of LiPol 3.7Volts battery inside power bank. After DC-DC converting you will get capacity around half - 5,000mAh for 5Volts output. If your RPi is just with all accessories is just taking out 500mA per hour this power bank will last for 10 hours maximum which is not in all scenarios (e.g. security, automation systems) enough.