[TriEmbed] Battery Power for Projects (informal survey)

[Tadd Torborg]

I'm using a 2.5amp-hour 12v Gel Cel - PS-1220  Costs $10 in quantity 10. 
https://www.amazon.com/gp/product/B077Y9FT5K

I'm using it as a backup supply to keep a Raspberry PI alive if the main 14.2v supply goes away.  I have the two main and battery diode ORed through a bridge rectifier to a DROK switcher supply which outputs 5.2v on USB to run the Raspberry PI 4B.  Another leg of the bridge rectifier provides 13.8v only from main supply, which I run through a 10watt 50ohm resistor back to the +DC lead on the gel cel.  This gives me a really cheap trickle charger. 



Objectives:
1. feed stable power to the Raspberry PI with 5.2v even if main supply glitches or goes off

2. run off a main power supply supply which can also feed power to 12-15v peripherals

3. have backup capability for at least several hours of running the Raspberry PI 4 and it's daughter cards.

4. be cheap

5. be easy to get now and into the future



Details on the trivial circuit are here:

http://tarpn.net/t/builder/builders_robust_power_for_raspberry_pi.html


  Tadd / KA2DEW

On November 18, 2019 at 12:41 PM, Robert Henry via TriEmbed <triembed at triembed.org> wrote:


(--sending from correct e-mail this time--)

Hey all,


Question for group: I'm curious what battery packages folks in this group use for their projects? If there is quite a variety - perhaps offer your favorite/most flexible.



Background: I'm currently selling ~12v LiFePO4 battery packs (4s1p) that I had as surplus from a consumer product.  Product launched with limited success, but the battery packs are selling well enough that I'm considering sourcing other chemistries / configurations.  Would like to keep with the embedded project market to start (that is - capacities less than 100 Watt-Hours).


Any insight would be greatly appreciated.  Thank you!
Rob Henry


Rob Henry

LT Cage Productions, LLC

ph: +1.919.245.7684

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