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Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 11:37 am
by DaveinOlyWA
Glenn wrote:
DaveinOlyWA wrote:its too bad that we dont have the option to warm the cabin during winter when charging instead of just wasting the excess heat. wonder if its too late to make any "winter package" suggestions?
Dave, I don't have my car yet, but I thought that the very thing you're asking for is already available in every LEAF, unless I'm not understanding what you mean by "wasting the excess heat."

Glenn
nope Glenn, afraid not. the excess heat is dissipated by a water/radiator system which DOES not lend to cabin heat. there is a pre-heat option but it uses ummm..."fresh" electricity to run. granted i have used it twice and its very efficient. only takes about 5-7 minutes (for all of you who report preheating for 20 mins) to completely clear a very frosted over Leaf.

i guess for viability, we would have to examine power consumption between the water pump for the cooling system and a low speed fan into the interior?

Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 2:04 pm
by GroundLoop
From what I can tell, Charging dissipates very little heat.
The hood isn't even warm. The batteries don't even rise "one bar" in the temperature graph on a full charge. It wouldn't be worth any added complexity to try to scavenge the charging heat into the cabin.

I haven't seen the car ever come back for a "second helping" after the 100% charge is complete. It makes a loud 'thunk' any time the EVSE switches the relay, so I think I would notice. I haven't seen it on the power charts either. The post-absorption trickle charge duration and shape does seem to vary, but it doesn't seem to disconnect the relay and restart. Have you seen this?

To confirm: Yes, the Blink EVSE is the one and only device downstream of this utility meter. There is no other load, and the load rests at zero when the Blink is unplugged.

I'll experiment with 80% someday soon, but for now, I want the extra range reserve that I can only get with 100%.

I had to abandon the Blink's internal timer as well -- too buggy. So I'm on the LEAF's internal timer now. This means I get the short-term 'clunk' on connection, as the Leaf tests the juice.

Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 2:19 pm
by evnow
GroundLoop wrote:I haven't seen the car ever come back for a "second helping" after the 100% charge is complete. It makes a loud 'thunk' any time the EVSE switches the relay, so I think I would notice. I haven't seen it on the power charts either. The post-absorption trickle charge duration and shape does seem to vary, but it doesn't seem to disconnect the relay and restart. Have you seen this?
Yes.

For eg. 22nd night at 7:51 PM I got one charge complete message. Two more messages in the morning at 5:38 AM and 7:14 AM. The kwh used on 23rd morning was slightly more than what Blink showed on 22nd night - by 0.05 kwh or so.

I don't have a separate meter - but I'll probably get the optical meter reading one of these days. Which one do you have ?

Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 3:14 pm
by GroundLoop
evnow -- I believe that your observation is because of a bug or crash in the Blink, and not intentional Leaf behavior.

When the Blink crashes, it may cycle power to the car, which causes the Leaf to do "another charge". You get the same start/end notifications in this event, as if you had disconnected and reconnected the J1772 plug.

These "bonus" charges from the Blink allow the Leaf to go through a brief but full charge, reaching the endpoint and doing some amount of post-charge trickle off.

For example, when I had my Blink set to 12:00-12:00 for Sat & Sun, at each midnight it would cycle power briefly and start the LEAF charging again.

Once I changed the Blink to "charge always" and used the timer in the Leaf instead, I did not see any more of these "brief charge" events.

I also notice that the Blink crashes quite often -- it frequently goes through boot-up screen during charge, or after.

Here's the thread discussing the optical port adapter:
http://www.mynissanleaf.com/viewtopic.p ... lit=tespro

Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 3:22 pm
by smkettner
Multiple charges to 100% does not sound good to me.

Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 5:18 pm
by evnow
GroundLoop wrote:evnow -- I believe that your observation is because of a bug or crash in the Blink, and not intentional Leaf behavior.

When the Blink crashes, it may cycle power to the car, which causes the Leaf to do "another charge". You get the same start/end notifications in this event, as if you had disconnected and reconnected the J1772 plug.
I haven't had any crashes of Blink lately. BTW, I charge to 80%.

My cable is plugged in from the time I come home to the time I leave i.e. evening till morning. Blink is set to charge all the time and Leaf charges from 7 PM to 10 AM.

Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 6:16 pm
by evnow
GroundLoop wrote:Here's the thread discussing the optical port adapter:
http://www.mynissanleaf.com/viewtopic.p ... lit=tespro
Interesting ... Black&Drecker has one. Below $30 at Amazon. No link to PC, though. Just a handheld meter.

http://www.amazon.com/Black-Decker-EM10 ... 117&sr=1-3

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Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 8:37 pm
by GroundLoop
Umm.. that's not a data adapter. That's a stand-alone kWh counter. It either watches the spinning rotor with the black mark, or the IR pulse (emitter) that approximates the same. Fine and all, but it's a different deal than the precise values from the meter.

Guys -- the ANSI port on the modern meters is a full-fledged RS-232 *DATA* port. You send the meter queries, it sends responses. This is how the meter reader reads out the monthly usage, sets the programming, and so on.

Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Tue May 24, 2011 11:15 pm
by GroundLoop
So here's a charge to 80%.. doesn't look much different, and I don't see any after-charge events. Granted, I only waited an hour.. do they usually come much later?

I want to get on with the 100% charge..

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Re: Blink end-of-charge demand curve, and power used by A/C

Posted: Wed May 25, 2011 4:36 am
by Herm
GroundLoop wrote:So here's a charge to 80%.. doesn't look much different, and I don't see any after-charge events. Granted, I only waited an hour.. do they usually come much later?
Probably no cell balancing stage if you only charge to 80%, and that makes sense, its one of the reasons its a recommended way to charge.