LiFePO4 charger ( solar, TEG, dynamo )

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mr.jb.swe
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LiFePO4 charger ( solar, TEG, dynamo )

Postby mr.jb.swe » Thu Oct 23, 2014 6:55 pm

Hi

Does anyone have suggestions on a small LiFePO4 charger circuit ? ( intended for 5-6V solar panels )
Something similar to TP4056 but for LiFePO4 would be very interesting

So far, I have just found the TP5000 http://www.electrodragon.com/w/TP5000
This circuit has a huge drawback ...it will stop charging once the current is below a certain threshold..useless for solar charger !? ( is there a workaround ? )

Why LiFePO4 ?
https://www.youtube.com/watch?feature=p ... zqFsY&t=53
They kick ass and have long shelf life, many charge cycles >2000.. ( +7000 with A123 )

I also think it's important to try to catch most of available current when sun,heat or motion is the source. This inevitably means larger batteries higher charge currents => LiFeO4

My primary use cases are flashlight and gps ....the rest is considered secondary fun use. I prefer a single cell system ...where I sometimes may combine my LiFePO4 cells into a 12V ( or whatever I need ). And I always have the option to use a step-up from a single cell LiFePO4.

Fore those who are into flashlight....a Cree XML-l2 with good cooling could be connected directly to a LiFePO4 ( no driver )....but it's more of an emergency option
It's also worth to notice a LiFePO4 can deliver more amp than you'll need ( how about soldering or even spot welding int the field )

MPPT ( nice to have when the solar panel voltage is much higher than 1.2xbattery float voltage )
http://www.eetimes.com/document.asp?doc_id=1279330
http://www.scirp.org/journal/PaperDownl ... aperID=725
http://web.archive.org/web/201304301639 ... ar-charger

/JB

been there done that

liFePO4
http://cds.linear.com/docs/en/lt-journa ... imDrew.pdf
http://www.digikey.com/catalog/en/partg ... oard/36740
http://www.youtube.com/watch?v=Nrhx9Sg8 ... e=youtu.be

li-ion
http://lygte-info.dk/review/Review%20Ch ... %20UK.html
http://www.adafruit.com/products/390
http://www.seeedstudio.com/depot/lipo-r ... p-992.html

NiMh
http://www.digitaldingus.com/reviews/ma ... c401fs.php
:) 1Charger to rule them all
http://hackaday.io/project/1936-1charger


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