Sai lo
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Portable power for pi5

Thu Dec 07, 2023 10:31 am

I need a battery pack similar to the Pisugar but can produce 5V and 5 amp for the Pi 5 and a 5V 2 amp screen. If anyone has any recommendations I'd appreciate it.
Thanks.

bjtheone
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Re: Portable power for pi5

Thu Dec 07, 2023 1:01 pm

Three comments....

1) You need to specify desired runtime, or the responses you get are going to be meaningless
2) 5V @ 7A is a big ask for truly portable power with a reasonable runtime
3) Do you really need 5A for the Pi. That current is for the pathological workload case of all CPUs pinned with max current draw from the USB ports.

My Pi 5, booting from a USB connected SSD seems to be perfectly happy being powered from a DigiAMP+ hat, which claims to be supplying 5.1V @ 2.5A.

hippy
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Re: Portable power for pi5

Thu Dec 07, 2023 2:50 pm

bjtheone wrote:
Thu Dec 07, 2023 1:01 pm
2) 5V @ 7A is a big ask for truly portable power with a reasonable runtime
Especially with PiSugar footprint which is Pi Zero sized - https://www.pisugar.com

I would be looking at car, motorcycle or SLA batteries though 'kids of today' do tell me I am 'old school'. I tell them they have never lived, haven't suffered for their art, until they've made and worn a battery vest to facilitate a full day of video recording with an old school camcorder.

W. H. Heydt
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Re: Portable power for pi5

Thu Dec 07, 2023 2:58 pm

bjtheone wrote:
Thu Dec 07, 2023 1:01 pm
2) 5V @ 7A is a big ask for truly portable power with a reasonable runtime
This also depends on the definition of "portable". I say this as someone who spent some time using the original Compaq "portable" (aka luggable) PC that weighed 28 lbs. One sometimes wondered if one arm was slowly getting longer....

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HermannSW
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Re: Portable power for pi5

Thu Dec 07, 2023 3:20 pm

You might power the Pi from a lipo with step-down regulator.
I did that with (too big for you) 4S lipo:
viewtopic.php?p=1778220&hilit=LM2596+hermannsw#p1778279

I used LM2596 step-down converter.
For 5V you need at least 2S lipo (2 cells).
You want 7A in total, that needs mAh*C of 51.4 or higher (C being the lipo C rating).
(in posting above I used 4S 1300mAh 95C lipo that can deliver 1.3*95=123.5A continuously)
You can find many such lipos eg. on amazon.com.
A quick search for "2S lipo 25C" found a 37$ 2S 3000mAh 25C lipo, that can deliver 75A continuously (at 1V).
Or 7A at 7.4V you want.


Be safe when playing with such powerful lipos, I bought a lipo safety bag for charging those.
Last edited by HermannSW on Thu Dec 07, 2023 3:21 pm, edited 1 time in total.
https://github.com/Hermann-SW/RSA_numbers_factored
https://stamm-wilbrandt.de/GS_cam_1152x192@304fps
https://hermann-sw.github.io/planar_graph_playground
https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://stamm-wilbrandt.de/

bjtheone
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Re: Portable power for pi5

Thu Dec 07, 2023 3:21 pm

W. H. Heydt wrote:
Thu Dec 07, 2023 2:58 pm
bjtheone wrote:
Thu Dec 07, 2023 1:01 pm
2) 5V @ 7A is a big ask for truly portable power with a reasonable runtime
This also depends on the definition of "portable". I say this as someone who spent some time using the original Compaq "portable" (aka luggable) PC that weighed 28 lbs. One sometimes wondered if one arm was slowly getting longer....
Hence the "truly" qualifier. I had the Compaq and and then a MacSe which weighted in a svelte 17 lbs. Nothing quite like dashing through an airport with a briefcase and a luggable....

I would go 12V gel cell battery in the electric ride on kids car or motorcycle size. I really like the gel cells since you can package them in any orientation and abuse the heck out of them. Car batteries are freakin heavy, though if you can live with wheeled case level of portable a deep discharge marine/RV battery would be great.

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CharlyDelta
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Re: Portable power for pi5

Thu Dec 07, 2023 3:51 pm

Here we have a Dewalt battery and an adapter (there's room inside for a Step Down). As shown, it's a Pi4 with camera. Please note that the Dewalt battery has no safe cut-off protection. But other brands of similar batteries do. Or add an XH-M609 module.
Don't ask me how long it will feed the Pi.... I have no idea. Give it a try.

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