281
edits
5V UPS for Raspberry Pi: Difference between revisions
Jump to navigation
Jump to search
no edit summary
No edit summary |
No edit summary |
||
| Line 4: | Line 4: | ||
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. | 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. | ||
---- | |||
== USB current and USB cables == | == USB current and USB cables == | ||
[[File:Cabling.jpg|200px|thumb|Belkin USB cable]] | [[File:Cabling.jpg|200px|thumb|Belkin USB cable]] | ||
| Line 10: | Line 10: | ||
Unfortunately not all power supplies and power banks are able to provide that much power. You can buy some cheap UPS for 500mA from Adafruit (e.g. [http://www.adafruit.com/products/1944 PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost]) but they won't be able to provide enough current for your RaspberryPi with all accesories which might use as much as 2A. Not only that - some cables has high impedance and are unable to transfer enough power for your device. For example devices with Belkin USB cable was charging only 400mA while with Samsung USB cable I was able to achieve charging speed up to 1,000mA with same charger. | Unfortunately not all power supplies and power banks are able to provide that much power. You can buy some cheap UPS for 500mA from Adafruit (e.g. [http://www.adafruit.com/products/1944 PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost]) but they won't be able to provide enough current for your RaspberryPi with all accesories which might use as much as 2A. Not only that - some cables has high impedance and are unable to transfer enough power for your device. For example devices with Belkin USB cable was charging only 400mA while with Samsung USB cable I was able to achieve charging speed up to 1,000mA with same charger. | ||
---- | |||
== How much current do you need? == | == How much current do you need? == | ||
[[File:Charger-doctor.jpg|200px|thumb|USB Charger Doctor]] | [[File:Charger-doctor.jpg|200px|thumb|USB Charger Doctor]] | ||
It is sometimes difficult to determine how much current is your device using and how much current do you need. Of course you can use multimeter but in case you do not want to buy two USB connectors and connect multimeter between them for example using breadboard I would recommend you using ready to use solution called '''CHARGER Doctor'''. You can buy it from China on [http://www.ebay.com/ E-Bay] for approximately 2 USD including WorldWide shipping from many suppliers. | It is sometimes difficult to determine how much current is your device using and how much current do you need. Of course you can use multimeter but in case you do not want to buy two USB connectors and connect multimeter between them for example using breadboard I would recommend you using ready to use solution called '''CHARGER Doctor'''. You can buy it from China on [http://www.ebay.com/ E-Bay] for approximately 2 USD including WorldWide shipping from many suppliers. | ||
---- | |||