enzioprecise
Posts: 14
Joined: Mon Feb 03, 2014 4:53 am

Use RPi with Power Bank 30000mAh

Mon Feb 03, 2014 5:05 am

Hello everyone!
I'm new with RPi.
I thinking of buying a portable battery for my Pi.
RPi plug in :
1 Webcam Logitech C270,
1 USB Hub with power supply.
1 HDMI to VGA cable.
1 Screen 7 inch
1.USB Wifi
1 Wirerless Mouse+Keyboard
2 USB Fan
and some USB.
I read some test RPi with battery with 10400mAh and Pi not connect too many thing.
Pi shutdown after ~17 hour.
So I want ask if anyone had test with 30000mAh battery and plug more thing like me how long Pi can run.Because I think about 50000mAh .
Thank you for read my post

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FLYFISH TECHNOLOGIES
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Re: Use RPi with Power Bank 30000mAh

Mon Feb 03, 2014 12:06 pm

Hi,
enzioprecise wrote:1 HDMI to VGA cable.
Take a powered converter instead of this cable.
enzioprecise wrote:... and plug more thing like me how long Pi can run
You need to take numbers (power consumption) of each your device from the list and calculate sum.
Even with this your "customized" sum, it is going to be an approximation, because the power consumption depends of the mode of each device (eg. the webcam is capturing or not), etc.

So, you cold take another approach - instead of calculating the values from specifications, measure them.
Put everything together (without Power Bank) and measure overall current for various use cases. Then estimate your ratio of these use cases and you'll get quite precise average consumption. At this point you have easy math to multiply averaged consumption with authonomy needed... and the result is required Power Bank capacity.


Best wishes, Ivan Zilic.
Running out of GPIO pins and/or need to read analog values?
Solution: http://www.flyfish-tech.com/FF32

klricks
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Re: Use RPi with Power Bank 30000mAh

Mon Feb 03, 2014 2:05 pm

The RPi has no need for any fans

If you get an HDMI monitor then you will not need an HDMI to VGA converter box.
https://www.sparkfun.com/products/11612

Most portable monitors run from 12V DC so you will need a 12V battery. You will then need a converter to change from 12V to 5V for the RPi and USB hub etc.
Unless specified otherwise my response is based on the latest and fully updated Raspbian Buster w/ Desktop OS.

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pluggy
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Re: Use RPi with Power Bank 30000mAh

Mon Feb 03, 2014 4:37 pm

I often wonder which arm of whose marketing department came up with rating large batteries in 1000's of milliamp hours.....

Its bulls##t in the extreme to my eyes. What was wrong with amp hours ?
Don't judge Linux by the Pi.......
I must not tread on too many sacred cows......

Ravenous
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Location: UK

Re: Use RPi with Power Bank 30000mAh

Mon Feb 03, 2014 4:46 pm

pluggy wrote:What was wrong with amp hours ?
Could not agree more.

It makes the number look bigger.

I'm waiting for a battery with a MILLION mAh (Micro-amp hours... someone will try it...)

MarkDaniels
Posts: 59
Joined: Sun Oct 28, 2012 2:01 pm

Re: Use RPi with Power Bank 30000mAh

Mon Feb 03, 2014 5:00 pm

by Ravenous » Mon Feb 03, 2014 4:46 pm

I'm waiting for a battery with a MILLION mAh (Micro-amp hours... someone will try it...)
Yeah, I actually have a 1 million mAh battery (1000 Ah)! It's 12 volt, lead-acid and weighs about 600 kg. It's made up of six wet (not gel) cells! So annoying how marketers b*stardise units purely for sales gains and then they become standard.

enzioprecise
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Re: Use RPi with Power Bank 30000mAh

Tue Feb 04, 2014 3:59 am

Thanks for reply,
I connect RPi to projector so i need HDMI to VGA Converter.
I wonder how long I can use Pi with 30000mAh because i want use it about 15 hour/day.

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FLYFISH TECHNOLOGIES
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Re: Use RPi with Power Bank 30000mAh

Tue Feb 04, 2014 10:18 am

Hi,
enzioprecise wrote:I wonder how long I can use Pi with 30000mAh because i want use it about 15 hour/day.
Connect everything together and measure the current consumption. If it is lower than 2A, then you can reach this goal.


Best wishes, Ivan Zilic.
Running out of GPIO pins and/or need to read analog values?
Solution: http://www.flyfish-tech.com/FF32

enzioprecise
Posts: 14
Joined: Mon Feb 03, 2014 4:53 am

Re: Use RPi with Power Bank 30000mAh

Tue Feb 04, 2014 11:02 am

Thank you very much.

JoeDaStudd
Posts: 274
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Re: Use RPi with Power Bank 30000mAh

Wed Feb 05, 2014 11:53 am

pluggy wrote:I often wonder which arm of whose marketing department came up with rating large batteries in 1000's of milliamp hours.....

Its bulls##t in the extreme to my eyes. What was wrong with amp hours ?
iirc its because mobile phone batteries have always been rated in mah and the 5v power packs with the usb sockets started off as emergency mobile phone chargers.
It was easier for someone with a 1620mah phone battery to see they needed 1620mah or better power pack. As opposed to having to convert 1620mah into 1.62 ah then find a 1.62ah or better power pack. I know its simple maths, but for the average Joe its something they cba to do.

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