jvernan
Posts: 4
Joined: Wed Sep 19, 2018 2:16 pm

What battery do I need based on these components?

Sun Sep 23, 2018 12:01 am

Image

I am thinking about using USB 5V Voltage Booster Step Up Module, with a lipo battery of 3.7v and 2500 mah?
Last edited by jvernan on Sun Sep 23, 2018 1:26 am, edited 1 time in total.

klricks
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Location: Grants Pass, OR, USA
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Re: What battery do I need based on these components?

Sun Sep 23, 2018 12:35 am

jvernan wrote:
Sun Sep 23, 2018 12:01 am
1.- raspberry pi 3

2.- Sim800L
3.- usb-ttl
4.- ublox neo 6m gps
5.- camera
6.- ADC ADS1015
7.- Sharp-2Y0A21

I am thinking about using USB 5V Voltage Booster Step Up Module, with a lipo battery of 3.7v and 2500 mah?
You will need to gather current specifications from the product datasheets OR better... Neasure the actual current usage of your complete system while in operation.
Decide how many minutes of run time you need.
Buy a USB powerbank that can meet your requirements if possible.
I am guessing the setup you mentioned will run 30 min to an hour?
Unless specified otherwise my response is based on the latest and fully updated RPiOS Buster w/ Desktop OS.

LTolledo
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Re: What battery do I need based on these components?

Sun Sep 23, 2018 12:40 am

How about using 8D battery and a few buck converters......
"Don't come to me with 'issues' for I don't know how to deal with those
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W. H. Heydt
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Re: What battery do I need based on these components?

Sun Sep 23, 2018 2:02 am

At a rough calculation--with what you've shown--you're going to need something more than a 3A supply. It would probably be best to spec your PSU for 4A. In addition, you've "low balled" the power for the Pi3B. The fully loaded spec for a Pi3B is 2.4A, though that allows for 1.2A to the USB ports. If any of the peripherals are going to be connected to the USB ports, you can adjust your total power requirements accordingly.

You really need to build your full hardware config and *measure* the power requirements.

grahamed
Posts: 277
Joined: Mon Jan 30, 2012 7:01 pm

Re: What battery do I need based on these components?

Sun Sep 23, 2018 5:59 pm

The current for the USB-serial is suspiciously large, not more than 50mA and probbly more like 25mA.

The current draw of the devices is the same whether they are pugged into the Pi USB ports or elsewhere; why assume a fully loaded Pi and then count them twice?

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