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DaveEV
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Re: How to mitigate a badly out of balance pack?

Sat Nov 16, 2013 3:24 pm

Rauv wrote: I had a 2012 SL and the tapering off during the final hours of 100% charge was not nearly so dramatic as my 2013. It tapers, as seen in the graph link below, but not as gradual. Also, I do not have any data to support any balancing ocurring later (several hours) but that does not mean it doesn't happen, just not for me because I never left it at a high state of charge for very long.

2012 charging graph:

http://www.tc.umn.edu/~rauvo001/2012%20 ... arging.pdf
Great chart! Matches up with the others I've seen, but with better resolution.

cwerdna
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Location: SF Bay Area, CA

Re: How to mitigate a badly out of balance pack?

Sat Nov 16, 2013 7:15 pm

Rauv wrote:Here is my typical charging load profile that clearly shows tapering and bumps, presumably when balancing is occuring.

http://www.tc.umn.edu/~rauvo001/2013%20 ... arging.pdf
Thank you! This saved me the trouble posting my tiny Chargepoint EVSE graph that only is in 5 minute increments.

Yep. This looks basically like what I see when charging to 100% at work.

For me, on my charge to 100% on Friday, I received a charging complete email from Carwings at 5:22 pm. Chargepoint graph showed a 0.55 kW draw at 17:23:24, but again, they only show 5 minute increments. I noticed no more bumps in their graph after that. At 5:38 pm (they probably have a built in delay before sending this), I received a
ChargePoint Notification: Charging Complete

Dear (my name),

We wanted to let you know that your vehicle, which is charging at (work location), is drawing very little power. Typically, this means it's fully charged, however, it may also indicate that your vehicle is configured for delayed charging. Your vehicle has accepted 7.72 kWh of electricity and has been plugged in for 02:35:10 (hh:mm:ss)....
I pulled the plug at 7:19 pm and was monitoring the graph until a few minutes before that (received ChargePoint Notification: Plugout Detected mail at 7:19 pm).

For me, on my '13 SV, if I charge only to 80%, the draw abruptly drops from ~5.8 or 5.9 kW to 0 and I'm pretty sure there are no bumps after that. EVSEs at work run at 208 volts, per the Chargepoint tech who came to my work a few weeks ago.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
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Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

arnis
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Re: How to mitigate a badly out of balance pack?

Thu Mar 17, 2016 11:12 am

I also confirm this on European 2014 Leaf.
3-10 bounces (depending on temperature) are expected if charging to 100%.
It stops when consumption drops to 500W or less and highest cell at maximum
voltage (4,136V or smth, depends on temperature a little bit) and resumes after
after small pause. Does make sense. Why keep charging if more than half of
the juice is wasted on pumps and other parasitic devices :lol:

If battery is below freezing charging might take 2-4 hours from 90% to 100%.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

cwerdna
Posts: 9819
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: How to mitigate a badly out of balance pack?

Fri Mar 16, 2018 10:06 am

Rauv wrote:Here is my typical charging load profile that clearly shows tapering and bumps, presumably when balancing is occuring.

http://www.tc.umn.edu/~rauvo001/2013%20 ... arging.pdf
Rauv,

If you're still active here, can you repost these somewhere? The URLs are dead and I guess nobody submitted them to http://archive.org/web/.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Rauv
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Re: How to mitigate a badly out of balance pack?

Sat Feb 16, 2019 6:59 am

Oops. been gone a while. Here is the '13 Leaf charging graph:

https://www.dropbox.com/s/ip156e47rqztw ... g.pdf?dl=0
2013 Cayenne SL [70 months][45000 mi][11 bar]
GE Wattstation 7.2kw EVSE + EVSE Upgrade (16A)
5.67 kw PV System. 3-ton GSHP

cwerdna
Posts: 9819
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: How to mitigate a badly out of balance pack?

Sun Feb 24, 2019 2:19 am

Rauv wrote:Oops. been gone a while. Here is the '13 Leaf charging graph:

https://www.dropbox.com/s/ip156e47rqztw ... g.pdf?dl=0
Thanks!

Do you still have the '12 charging graph?

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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