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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Wed Oct 08, 2014 5:53 am 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4075
Location: San Diego
I just did a full range test on #2496:

10,800 miles

Full charge to Turtle mode

116.4 miles
2.9 miles per kWh from
40.14 kWh calculated burn +/- about 0.5
39.4 kWh reported net burn from CAN bus (48.2kWh burned, 9.3 kWh regen)
0.5 kWh estimated remaining usable energy (1.4% * 39.9kWh)
41.8 kWh advertise useable when new at room temperature

1.4% SOC
2.992v - 3.096v - minimum / maximum resting cell voltage
278.72v - resting pack voltage (92 series configuration)
30C - 32C - minimum / maximum cell temperatures


39.9 / 41.8 = 95.5% capacity from new (4.5% loss, however full charge was only 97-ish%)

4.2 - maximum cell voltage during regen
4.14 - maximum observed resting voltage (I believe 4.15 is probably specification)
2.5 - educated guess minimum cell voltage before auto shutdown


Edit: 8 October 2014

42.063kWh - Full charge reported by the CAN bus
50.0kWh - estimate of "from the wall" power required

84% charger efficiency @ 40 amps / 240 volts



Image

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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Wed Oct 08, 2014 3:08 pm 
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Joined: Thu Dec 27, 2012 10:55 pm
Posts: 606
TonyWilliams wrote:
I just did a full range test on #2496:


Is that the one you are going to QC today ?

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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Wed Oct 08, 2014 3:39 pm 
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Location: San Diego
fromport wrote:
TonyWilliams wrote:
I just did a full range test on #2496:


Is that the one you are going to QC today ?


We will probably do #2496 and #1134.

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Tony Williams
QC Charge
1780-104 La Costa Meadows Drive
San Marcos, California 92078 USA
tony@QCcharge.com
www.QCcharge.com
Twitter: QCPower
1-844-EV-PARTS
1-844-387-2787
1-760-798-0342 Office
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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Wed Oct 08, 2014 5:10 pm 
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Joined: Thu Dec 27, 2012 10:55 pm
Posts: 606
TonyWilliams wrote:
We will probably do #2496 and #1134.


Exciting, please keep us posted.
A photo would be nice as well

Q:
you wrote about an empty battery pack:
Quote:
278.72v - resting pack voltage (92 series configuration)


From a quick glance over some of the chademo specs that is freely available on the net,
a chademo is imho a huge programmable powersupply.
I assume they won't start with a charging voltage of 390 volt of a full battery pack.
do they gently increase the voltage until a certain amps/kW is reached and they gradually increase
the voltage during the charge ?

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past ev's: 3 yr leaf 30k, 3yr rav4ev 34k, 3yr rav4ev 25k


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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Wed Oct 08, 2014 6:57 pm 
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Joined: Fri Mar 01, 2013 10:01 pm
Posts: 189
Location: Long Beach, CA
fromport wrote:
From a quick glance over some of the chademo specs that is freely available on the net,
a chademo is imho a huge programmable powersupply.
I assume they won't start with a charging voltage of 390 volt of a full battery pack.
do they gently increase the voltage until a certain amps/kW is reached and they gradually increase
the voltage during the charge ?

The charger is a current regulated source. See http://www.chademo.com/05_protocol.html

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Shoreline Blue Pearl 2012 Rav4 EV


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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh
PostPosted: Wed Oct 08, 2014 9:14 pm 
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Joined: Mon May 13, 2013 6:15 am
Posts: 343
Location: Volcano, CA
miimura wrote:
showing the linux boot text going by on the screen when you power it on pretty much ruins the first impression...


au contraire, mon ami.... that reassures me that its not built on some version of embedded WIndows!

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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Wed Oct 08, 2014 9:16 pm 
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Joined: Mon May 13, 2013 6:15 am
Posts: 343
Location: Volcano, CA
oh and i've never seen that screen "No driving power avialable". When mine turtled (the one time i've done that) i didnt get that screen. But i was only turtling for 0.9 miles mostly flat. so maybe i didnt get down as far as you did).

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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Wed Oct 08, 2014 11:59 pm 
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Joined: Thu Oct 02, 2014 7:51 pm
Posts: 39
Hi,

This might be a little off topic but would running the traction battery all the way down to turtle be good for it? I know some batteries have memory issues and it helps to run them down from time to time.

Also, are there a general rules regarding good battery treatment for longevity?

thanks
james

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2014 Rav4 EV Blizzard Pearl #3192
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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Thu Oct 09, 2014 5:33 am 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4075
Location: San Diego
james wrote:
Hi,

This might be a little off topic but would running the traction battery all the way down to turtle be good for it? I know some batteries have memory issues and it helps to run them down from time to time.

Also, are there a general rules regarding good battery treatment for longevity?

thanks
james



Lithium batteries don't have memory issues. The best place for the battery is charged to 50%, then kept cool. That's ideal.

Anything that isn't the above is "bad" for the battery.

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Tony Williams
QC Charge
1780-104 La Costa Meadows Drive
San Marcos, California 92078 USA
tony@QCcharge.com
www.QCcharge.com
Twitter: QCPower
1-844-EV-PARTS
1-844-387-2787
1-760-798-0342 Office
Hours M-F, 9-5 Pacific Time


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 Post subject: Re: Traction Battery - Volts, Amps & SOC%, kWh, Rated Range
PostPosted: Sun Jun 26, 2016 7:48 pm 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4075
Location: San Diego
I have assumed for sometime that the RAV4 EV used 2900ma cells. A little background; the Tesla Roadster used 2600ma cells, as did the Smart ED, and as did the prototype RAV4 (using two 18kWh Smart ED packs).

RAV4 EV has to have a 45kWh-ish battery to be able to offer 41.8kWh usable when new, and we know there are 4416 cells in Rav4 EV. Divided into the 7104 cells that are in a 85/90kWh Tesla Model S = 0.6216 ratio.

0.6216 * 85kWh = 52.8kWh, so clearly the two cars do not share the same 3100-3400ma cells used in Model S. We knew that.

So, 45kWh divided by 52.8kWh is about 85%

85% of 3100ma cells = about 2600ma.

So, just swapping the cells from the 90kWh car (3400ma) will provide a 30% boost in range.

Take the cells from your current RAV4 and use them for a home battery backup.

It's looking more and more like RAV4 EV uses 2600ma cells.

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Tony Williams
QC Charge
1780-104 La Costa Meadows Drive
San Marcos, California 92078 USA
tony@QCcharge.com
www.QCcharge.com
Twitter: QCPower
1-844-EV-PARTS
1-844-387-2787
1-760-798-0342 Office
Hours M-F, 9-5 Pacific Time


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