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 <[email protected]> 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 _______________________________________________ Triangle, NC Embedded Computing mailing list To post message: [email protected] List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org TriEmbed web site: http://TriEmbed.org To unsubscribe, click link and send a blank message: mailto:[email protected]?subject=unsubscribe
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