On Sat, Mar 13, 2021 at 9:30 PM Willie via EV wrote:
> I don't recall what Jack recommended about stopping the charge. Perhaps
> depending on one or more cells reaching the upper single cell limit.
>
Basically it was to charge to 3.65Vpc and stop when the current
dropped to 0.05C. That is what th
paul dove via EV wrote:
Unless you change the chemistry they will be the same voltage
Paul, that is exactly right. And they *do* change the chemistry...
often. You can buy a batch from the same vendor a year later, and the
formulation will have changed.
I suppose that is possible but I nev
For some reason, I didn't see Willie's reply below. I may be excessively
argumentative.
However, my intent is to give accurate information. A lot of things are said in
these forums that
can both cost people a lot of money unnecessarily, shorten the life of their
cells or even be a hazard.
Sci
I suppose that is possible but I never observed that is the brands I have
tested.they always settled to 3.38v. I so no variation. I ran then in a vehicle
for 6 months. Never varied in the slightest. Very stable and predictable
performance. My experience is limited to a few brands but Physics is
At the risk of being called “overly argumentative” (though I’m sure you’ve
already pegged me for that), these discussions help everyone and provide for
greater clarity. They teach everyone, including those who think they know all.
I like accuracy, and far too often false or inaccurate stuff post
Thanks for the clarification. I didn't use lead acid in an of my vehicles.
Just know of the process.
On Monday, March 15, 2021, 11:36:29 AM CDT, Lee Hart via EV
wrote:
paul dove via EV wrote:
> Equalizing batteries is a process designed to de-sulphate lead acid battery
> plates by car
On 3/15/21 11:43 AM, paul dove via EV wrote:
I see. Still not correct. OCV for Lithium Iron Phosphate is 3.38 volts per
cell. Holding cells above this voltage damages the cells.
Paul, I haven't before pegged you as an excessively argumentative guy.
My LFP days are long past and not to be
paul dove via EV wrote:
I see. Still not correct. OCV for Lithium Iron Phosphate is 3.38 volts per
cell. Holding cells above this voltage damages the cells.
That's pretty close; but it depends on the design of the particular
cells you are talking about. There are dozens (perhaps hundreds) of
I see. Still not correct. OCV for Lithium Iron Phosphate is 3.38 volts per
cell. Holding cells above this voltage damages the cells.
On Monday, March 15, 2021, 11:18:12 AM CDT, Willie via EV
wrote:
On 3/15/21 10:16 AM, paul dove wrote:
> Equalizing batteries is a process designed
paul dove via EV wrote:
Equalizing batteries is a process designed to de-sulphate lead acid battery
plates by carrying out a controlled overcharge.
Close; but not quite right.
"Equalizing" refers to bringing each cell in a series string to the same
level of charge. It applies to *all* types o
On 3/15/21 10:16 AM, paul dove wrote:
Equalizing batteries is a process designed to de-sulphate lead acid
battery plates by carrying out a controlled overcharge. Battery plates
tend to acquire a sulphate coating over time which then hinders the
chemical action between the electrolyte and the
Equalizing batteries is a process designed to de-sulphate lead acidbattery
plates by carrying out a controlled overcharge. Battery plates tend to acquire
a sulphate coating over time which then hinders the chemical action between the
electrolyte and the plate. By equalizing the battery in this
Hi Gordon,
I'm still around, and still at Delta-q, which is now part of Zapi Group.
The Leaf is my wife's car, but she does let me drive it from time to time.
I've still got my conversion, and a lithium pack for it, but health issues in
recent years are making it quite challenging to do much p
On 3/13/21 11:47 PM, Gordon Wong via EV wrote:
My idea was to expedite the balancing process by starting at a low SOC and
let the BMS stop the charge when the lower capacity cells came up to 3.6
something or whatever the BMS was set to.
That bottom balancing confused everyone. As Bill wel
On 3/14/21 11:09 AM, paul dove wrote:
No! However, if you want them all at the same exact voltage then connect
them in parallel for a day. Then connect them in series and charge the pack.
To get balance closer, best to equalize in parallel while on the high
voltage tail. I would think some
No! However, if you want them all at the same exact voltage then connect them
in parallel for a day. Then connect them in series and charge the pack.
Sent from AT&T Yahoo Mail for iPhone
On Saturday, March 13, 2021, 2:19 PM, Willie via EV wrote:
On 3/13/21 1:57 PM, Lee Hart via EV wrote:
>
Gordon,
We use a "CellPro" PowerLab 8 to initially balance, and cycle our
LiFePO4 packs in groups of eight cells (or less.)
http://www.store.revolectrix.com/Products/Cellpro-PowerLab-8-EC5-version/Cellpro-PowerLab-8_3299
About $250 and you will realize that you have been sleeping under a
rock
Sorry if this message is not in the flow - I am a digest-only subscriber.
I have been helping John through this via direct email for maybe a couple
of weeks, and it was Willie who said it most accurately.
John's pack has probably never been properly balanced and an fire early on
due to improper m
On 13 Mar 2021 at 19:17, Alan Arrison via EV wrote:
> If you regularly run your cells to 2.5 volts, you'll be replacing them soon.
>
> 3.00 volts with no load is considered dead. 2.5 volts is deader than dead.
Thanks Alan. Is that true for LiFePO4? In the original post, John gave the
nominal
If you regularly run your cells to 2.5 volts, you'll be replacing them soon.
3.00 volts with no load is considered dead. 2.5 volts is deader than dead.
Al
On 3/12/2021 11:30 PM, John Titman via EV wrote:
Hello all: I am a newby so, bear with me . I have converted my 1965 Ford
Falcon to an all
On 3/13/21 3:47 PM, Bill Dube via EV wrote:
On 3/14/2021 5:18 AM, Willie via EV wrote:
His primary point was that bottom balanced voltage would drop off so
perspicaciously as the battery neared full discharge that there was
little risk of ignoring a few low cells as might be the case with
I recommend the iCharger 306B for charging individual cells, it can do
up to 30 amps.
Jay
On 3/13/21 3:29 PM, EVDL Administrator via EV wrote:
John, first of all, a '65 Falcon conversion is a SUPER COOL idea. I'm
jealous. Well done!
Second, I'm far from a lithium battery expert, but I'm havi
On 3/14/2021 5:18 AM, Willie via EV wrote:
His primary point was that bottom balanced voltage would drop off so
perspicaciously as the battery neared full discharge that there was
little risk of ignoring a few low cells as might be the case with top
balancing.
By "solving" the issue of to
John, first of all, a '65 Falcon conversion is a SUPER COOL idea. I'm
jealous. Well done!
Second, I'm far from a lithium battery expert, but I'm having trouble seeing
why you're concerned with "bottom balancing." I don't see why it would be
necessary or even desirable.
As I understand it, th
On 3/13/21 1:57 PM, Lee Hart via EV wrote:
John Titman via EV wrote:
Hello: Nobody answered my question The whole reason I need to balance my
batteries is that a number of batteries reach 3.6 volts before the
others,
who only reach only about 3.3 volts The Orion BMS shuts of the
charger and
On 3/13/21 1:57 PM, Lee Hart via EV wrote:
John Titman via EV wrote:
Hello: Nobody answered my question The whole reason I need to balance my
batteries is that a number of batteries reach 3.6 volts before the
others,
who only reach only about 3.3 volts The Orion BMS shuts of the
charger and
John Titman via EV wrote:
Hello: Nobody answered my question The whole reason I need to balance my
batteries is that a number of batteries reach 3.6 volts before the others,
who only reach only about 3.3 volts The Orion BMS shuts of the charger and
balances the batteries but, the same problem oc
Hello: Nobody answered my question The whole reason I need to balance my
batteries is that a number of batteries reach 3.6 volts before the others,
who only reach only about 3.3 volts The Orion BMS shuts of the charger and
balances the batteries but, the same problem occurs after the next
recharg
On 3/13/21 11:18 AM, Willie via EV wrote:
Jack Rickard's... primary point
was that bottom balanced voltage would drop off so perspicaciously as
the battery neared full discharge that there was little risk of ignoring
a few low cells as might be the case with top balancing.
I can see the p
wers ? https://quietcleanseattle.org/ >>
-- Original Message --
From: "Willie via EV"
To: ev@lists.evdl.org
Cc: "Willie"
Sent: 13-Mar-21 8:18:13 AM
Subject: Re: [EVDL] Bottom balancing batteries
On 3/13/21 4:00 AM, Bill Dube via EV wrote:
Trust the sc
On 3/13/21 4:00 AM, Bill Dube via EV wrote:
Trust the science. Trust that the OEMs would not spend an extra
penny on a BMS if they did not have to. Believe that you will have a
fire that could very well burn down your house if you forgo a BMS.
A very good support; I had intended to res
Hi John,
Your very nice Orion BMS will balance your batteries in standard
manner ("top" balancing, so to speak.) Orion makes an outstanding (and
a bit pricey) battery management system, with all the bells and whistles
if you wish to use those features.
Attempting to perform some sor
Hello all: I am a newby so, bear with me . I have converted my 1965 Ford
Falcon to an all electric vehicle with an HPEVS AC51 motor with a Curtis
1239e controller,
an Orion2 BMS . I've fitted 48- 271 Ah 3.2 volt batteries and am
experiencing
battery balance problems . I am in the process of bott
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