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Desulfator Engine, Heavy duty, DIY, Overnight results.

Mosaic

Well-Known Member
Thread starter #1
Hi all:
I'm starting a Hackaday project to open source my proven desulfator engine. This is a pulse charge engine for batteries outside the vehicle as it delivers 250W RMS capability to the battery with up to 800A pulses.
https://hackaday.io/project/25741-desulfator-engine-for-climate-change-mitigation

I am not open sourcing the whole automation project but I will support those who want to do it.
This is for the DIY folks who need a stable pulse engine they can add controls to and experiment with. The battery cell pics are a b4 and after of the same cell showing the improvements.
cell2-1020sg.jpg cell2-1240sg.jpg inductance.png Bosch1.jpg
 

dougy83

Well-Known Member
#3
Hello. The schematic presumably shows a 6.6mF capacitor bank switched across a lead acid battery. What voltage are the capacitors charged to, and how frequently are they discharged into the battery?
 

dougy83

Well-Known Member
#5
36V, 400 to 700Hz.
Thanks. Wow, that's a lot of power. 36V discharged to 12V battery (say pulse cutout at 20V) at 400 Hz is >1kW. I might dial it back a bit and try with some dodgy SLA batteries I have needing treatment.
 

Mosaic

Well-Known Member
Thread starter #6
Well, it might seem so, but a substantial amount of the pulses are lost to parasitics such as connector & cable impedance as well as in circuit impedance. Capacitor ESR must be kept to a minmum, I tested a number of capacitors before settling on the suitable type.
Have a look at the 'scope trace for a pulse and you can see the actual power delivery. In reality I see around 33% efficency based on what the battery actually accepts when subtracting the associated heating losses from impedance inside the battery as well as the power delivery subsystems.
 

tomizett

Active Member
#11
As ever, Mosaic, I tip my hat to your skill and hard work. It's heartening to see someone put this much effort into a project with such laudable goals.
it's also very satisfying to see something we've seen discussed so much here on ETO reach a stage of "completion" .
 

Mosaic

Well-Known Member
Thread starter #12
The hackaday project link in the 1st post now carries the PDFs of the toner transfer layouts for easy DIY and parts placement pdfs.
 

Mosaic

Well-Known Member
Thread starter #14
The Drain and source traces require buttressing with solder braid or # 18AWG bare wire to carry the pulse currents.
 

Mosaic

Well-Known Member
Thread starter #15
The commercial desulfator just went global...first order out of West Africa, even before commercial product launch!
Prepaid, of course...
 
#16
The commercial desulfator just went global...first order out of West Africa, even before commercial product launch!
Prepaid, of course...
I am African Prince. My uncle has shipping container containing solid gold Rolls Royce stuck in shipping container in your country. If you send me free desulfator I bring you big reward....?

Keep up the good work. I'm hoping to build later this year.
 

Mosaic

Well-Known Member
Thread starter #17
This time the prince pre-paid me....
Jamaica recycler just prepaid as well, and the MoU with the local assembly form isn't done yet. I guess that means there is serious demand given 0 advertising other than a little tech blog.
 

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