Last year, I was inquiring about custom battery packs and got the
following response from Tim. I don't know if he's currently on the list,
so I'm posting his response here, for you. You still need to source your
own cells, but he makes the rest of the process pretty easy.
Peri
--------------
I've designed an open source BMS and cell packaging system, if you don't
want to design your own.
You need to source some pretty amazing lithium ion cells for that 53C
discharge rate! I think you might end up with a larger battery to get
that big C rate.
Anyway it's free to use if you want here is the website for all the
files. https://github.com/offgridsystems
There are some parts up on ebay if you don't want to make/order your
own.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=dkblock&_sacat=0
Also a website if you want so build information.
https://dkblock922508958.wordpress.com
You may need to reprogram the Teensy (arduino like) controller (using my
code) for your application.
Cheers,
Tim Economu
Offgrid Systems LLC
Whidbey Island
<< Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
------ Original Message ------
From: "David Chapman via EV" <[email protected]>
To: "EVDL" <[email protected]>
Cc: "David Chapman" <[email protected]>
Sent: 08-Dec-20 7:23:39 PM
Subject: [EVDL] Lifepo4 packs math
Michael et al,
So after a little more study I guess I see the possible shortcoming on these
Lifepo4 packs, they have a recommended max discharge rate of 10 amps continuous
so if I am doing the math right 4 of these in series would give me a (approx)
52v 400-500 watt pack to the controller. This would be awesome for range but
probably rather sedate on the performance part. I probably need more like 30-40
amps @ 52v. Darn. TANSTAAFL. The search goes on. Dach.
"Do what you can, with what you have, where you are" - Theodore Roosevelt
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