David Nelson via EV wrote:
Lee, is your data available somewhere?
Much of my data is in the form of personal notebooks, so it's very
time-consuming to put online. Though I have typed in and posted a *lot*
of data on the EVDL over the years (probably more than anyone else).
When I do tests
Bill Dube via EV wrote:
The peer reviewed literature agrees with the scientific tests that Lee
Hart tried for himself... Do you understand the difference between anecdotal
evidence and
scientific test? When you say I measured the voltage and it was close
to the same that is anecdotal evidence.
From: Lee Hart via EV ev@lists.evdl.org
David Nelson via EV wrote:
Lee, is your data available somewhere?
Much of my data is in the form of personal notebooks, so it's very
time-consuming to put online.
I suggest scanning and then converting to an e-book format, which generally
OCRs
There were no parasitic loads on any particular cells. They were powered by the
whole string in Hardys test.
Sent from my iPhone
On Jun 27, 2015, at 10:34 PM, EVDL Administrator via EV ev@lists.evdl.org
wrote:
On 27 Jun 2015 at 15:29, Peter Gabrielsson via EV wrote:
He proved that
Watched the test on the video. In the end, he states Four of the cells
were toast. at the end of the test. These were the cells that were
_not_ protected by the BMS. This looks like the BMS did its job quite
well and the test showed what was expected.
I guess you can interpret results in
I find these chatty video presentations annoying. I'd rather read. But I
sat through this one, and got a few bits of useful info out of it.
1. You need a BMS that properly prevents over-discharge. Hardy murdered six
2000-cycle Headway LiFePO4 cells in 226 cycles (~11% of rated life) because
PS -- here's an interesting real-world experience with cell balance.
http://ka7oei.blogspot.com/2013/05/lithium-iron-phosphate-lifepo4.html
David Roden - Akron, Ohio, USA
EVDL Administrator
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
EVDL Information: http://www.evdl.org/help/
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Read back a a few days. Lee Hart explained the process entirely in an
earlier post on this . You just had to read his post on the subject.
You charge them, let them sit for x number of days, then discharge them
to see how many amp-hours remain, then you charge them up again to see
what their
Bill,
By looking at his graph it looked like they all failed but two. Cells 1$ 2. The
shunt balances were on 5 through 8. Those four failed first based on his graph.
johns conclusion stated that he could see no advantage to balancing cells since
the balanced ones stayed no closer in voltage
On Sun, Jun 28, 2015 at 9:27 AM, Bill Dube via EV ev@lists.evdl.org wrote:
There were folks right here on this list that performed a _scientific_ test.
They cycled cells to find their capacity, charged the cells fully, then
placed them in storage. After extended time on the shelf, they tested
. And it
doesn't seem needed for me.
Jerry Dycus From: EVDL
Administrator via EV ev@lists.evdl.org
To: Electric Vehicle Discussion List ev@lists.evdl.org
Sent: Sunday, June 28, 2015 5:44 PM
Subject: Re: [EVDL] Good data or bad? How do you
I have a question about the self-discharge data Cor (below) and Lee
has listed and/or referred to in various posts on the EVDL and more
recently referred to in the various self-discharge threads.
On Fri, Jun 19, 2015 at 2:48 PM, Cor van de Water via EV
ev@lists.evdl.org wrote:
I have shared that
...@lists.evdl.org] On Behalf Of Peter Gabrielsson via
EV
Sent: Saturday, June 27, 2015 3:30 PM
To: Paul Dove; Electric Vehicle Discussion List
Subject: Re: [EVDL] Good data or bad? How do you know? Or is it the
interpretation?
He proved that putting parasitic loads on some cells in a series string
Discussion List
Subject: Re: [EVDL] Good data or bad? How do you know? Or is it the
interpretation?
He proved that putting parasitic loads on some cells in a series string vill
cause the string to
go out of balance. Nothing else.
On Jun 27, 2015 1:37 PM, Paul Dove via EV ev@lists.evdl.org wrote
https://www.youtube.com/user/jlghardy/videos
John Hardy's YouTube channel is extremely interesting (here) he test some of
the theories out there about li ion batteries and the effect of a BMS.
In the video battery test 2 he demonstrates that a cell balancer actually
damages the cells.
Sent
He proved that putting parasitic loads on some cells in a series string
vill cause the string to go out of balance. Nothing else.
On Jun 27, 2015 1:37 PM, Paul Dove via EV ev@lists.evdl.org wrote:
https://www.youtube.com/user/jlghardy/videos
John Hardy's YouTube channel is extremely
On 27 Jun 2015 at 15:29, Peter Gabrielsson via EV wrote:
He proved that putting parasitic loads on some cells in a series string
vill cause the string to go out of balance.
That's what you'd expect, no?
I see this less-than-ideal behavior in my Ping batteries, which are fitted
with an
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