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Jimmydreams
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Re: Electrical charging - measured results, 120v vs. 240v

Sat Jan 15, 2011 11:22 pm

For anyone that is interested, my TED screen is available for anyone to look at. You can interact with it and view as much of the data as you want.

The main screen shows 3 MTU's. MTU1 is the house main. MTU2 is solar production, MTU3 is the EVSE. If you go to the graphic display, the ONLY MTU ON IT WILL BE THE EVSE!!

http://jjhamilton.dyndns-ip.com:50000/
(the page is slow to load, so be patient)

I generally keep a data sheet on my mileage, so if you see a day you want specific info on, let me know.
JimmyD
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AndyH
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Re: Electrical charging - measured results, 120v vs. 240v

Sun Jan 16, 2011 12:34 pm

DaveinOlyWA wrote:Balancing is something that should be working all the time even at 80%. If not then overcharging of high cells would be nearly unavoidable if charging to 100% which is one reason why 100% charging can be problematic.
Something I thought about was setting charge to 80% then letting it sit a bit then charging to 100% but not sure if the times would work with 110 volt charging being so slow
We don't have to think about this, Dave, because Nissan's got it all figured out and completely automated. The car monitors all cell voltages, current in and out, and cell internal resistance -- the car knows what's happening with the pack. Because of the full-time computerized monitoring and balancing, charging to "consumer 100%" (actual 90%!) is not problematic in the least.

We really do not need to think 'lead acid' or 'I must manage my pack' or 'I hope I didn't leave the charger on too long' or any of the other fears we have with DIY EVs because this car is in a completely different league. ;)
"The stupid become extinct."-Bill Mollison
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garygid
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Re: Electrical charging - measured results, 120v vs. 240v

Sun Jan 16, 2011 10:52 pm

If charging to 100% (of usable capacity) is not problematic in the least, why is charging to 80% suggested?
See SOC/GID-Meter and CAN-Do Info
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DaveinOlyWA
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Re: Electrical charging - measured results, 120v vs. 240v

Sun Jan 16, 2011 11:11 pm

80% provides a maximum level of safe reliable charging. Now that does not mean that 100% is not safe or risky. But as much as we would like to think we have battery management down, in actuality there are several things that are not completely understood. Add to that he changing capacities of the pack based on temperature age, depth of discharge, etc.

Its reallynothing more than covering your bases. Its like a game of zenga. It will not go on forever and that is the same with running anything all out, full bore or .....100%
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 2640.9 mi, 99.37% SOH
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garygid
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Re: Electrical charging - measured results, 120v vs. 240v

Sun Jan 16, 2011 11:29 pm

Sorry, that 80% is maximum safe, and 100% is also safe and not risky ...
to me, this "does not compute"!
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
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Randy
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Re: Electrical charging - measured results, 120v vs. 240v

Sun Jan 16, 2011 11:34 pm

I hadn't noticed this much with my work commutes, but I took a longer drive on Saturday. I left home at 100% charge, and all of a sudden I noticed that I wasn't getting any regen action (I was in ECO mode). Then it hit me that the pack was charged to 100%, so that must have been the reason...

I drove almost 10 miles before I saw any regen occurring, but it would only go on at 1 or 2 dots. I didn't see the whole amount of regen I'm used to until I had gone many more miles.

Since I live on a slight hill going down to work everyday, it probably makes sense to only charge to 80% for battery health as well as regen possibilities...

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planet4ever
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Re: Electrical charging - measured results, 120v vs. 240v

Mon Jan 17, 2011 3:30 am

sparky, evnow, and LEAFer have been talking about this over on ECO Mode Impressions. It begins to sound as if ECO mode only includes heavier regen if the charge level is below 80%.
End of April 2013: Traded my 2011 SL for a 2013 S with charge pkg.

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garygid
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Re: Electrical charging - measured results, 120v vs. 240v

Mon Jan 17, 2011 8:51 am

Is there any warning that Regen is not available (when in the higher SOC conditions)?
See SOC/GID-Meter and CAN-Do Info
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2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
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Solar PV: 33 x 225W -> 7 kW max AC
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Jimmydreams
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Re: Electrical charging - measured results, 120v vs. 240v

Mon Jan 17, 2011 10:08 am

garygid wrote:Is there any warning that Regen is not available (when in the higher SOC conditions)?
No, gary, and I can't tell a difference in braking action with/without regen. The only notice you get is if you happen to be looking at your energy meter you'll either see a regen indication or not.

Once you break barrier for no-regen (80-90%), the regen comes on slowly and eventually will be fully enabled. But as I said, from a purely feel standpoint when brakeing, Nissan did a great job of making the regen and mechanical brakes seemless.
JimmyD
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garygid
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Re: Electrical charging - measured results, 120v vs. 240v

Mon Jan 17, 2011 10:42 am

Since, in high-SOC, long-downhill situations, the disc brakes are your ONLY speed-regulating mechanism, they will need to be very heavy duty discs and pads, and the brake assembly will get, most likely, VERY hot.

But, hopefully, Nissan has designed for that (yes, infrequent) use.

Is there any special mention or caution about hot brakes in the manuals?

Clearly, this is an area where some planning ahead (to have less SOC at the top if the grade) would help.

In an emergency, turning ON the heater full blast, and opening all the windows to increase drag (and cool the car), are options to use.
Last edited by garygid on Mon Jan 17, 2011 10:51 am, edited 1 time in total.
See SOC/GID-Meter and CAN-Do Info
2010 Prius, now for sale
2011 LEAF, sold in 2015
2018 Tesla Model 3
2014 Tesla S, Model 3 in 2019
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
To Sell: X-treme 5000Li EV motorcycle

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