Kev994
Posts: 22
Joined: Wed Aug 28, 2019 6:00 pm
Delivery Date: 14 Sep 2019
Leaf Number: 309727

Re: Preheating cabin use battery

Wed Nov 13, 2019 7:32 pm

Try setting your preheat earlier? The big draw from the heater is at the beginning, the preheat stays on for a while... I’ve heard both 30 and 45 mins, mine seems to top up a bit higher when I’m running late.
2016 SL Coulis Red

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Nubo
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Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Preheating cabin use battery

Wed Nov 13, 2019 9:35 pm

jjeff wrote:
Wed Nov 13, 2019 3:21 pm
I believe what's happening(and I've noticed it too with my 30a EVSE and my 6.6kWh Leaf charger) is the battery is near(or at 100%) so it doesn't call for a full 27.5a that the car can draw, it just takes a top off amount which unfortunately isn't enough to keep up with the preheat draw. The only way I've found to avoid this is to set my '13 to 80%(you won't have this option on your '14 :( ) and set to 80% when the preheating starts the battery is low enough to basically draw the full amount the preheat is using from your EVSE. I know this won't do you any good if you want a 100% charge but it's just the way it is. Note you won't really lose more than a max of 3% off 100% from what I've observed but I understand when you want a full 100% you might feel cheated only getting 97%.
The way to get the most out of preheat in this case, is to make sure it runs long enough to thoroughly warm the interior, not just the air. As the cold-soak is removed, the overall consumption of the HVAC system goes down. And so the equilibrium point of charge rate vs. consumption will shift to a slightly higher state of charge. The pack will "catch up" a bit. And you won't be spending battery power to warm up cold fabrics, metal and plastics.
I noticed you're still working with polymers.

GerryAZ
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Re: Preheating cabin use battery

Thu Nov 14, 2019 3:05 am

I have a different perspective: My experience with 2015 was that the battery would show only 96% to 98% SOC on dash display, but would have higher voltage (Leaf Spy display) after running climate control while plugged in. Therefore the battery was actually at full charge even though the dash display indicated less.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019

LeftieBiker
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Re: Preheating cabin use battery

Thu Nov 14, 2019 4:36 am

GerryAZ wrote:
Thu Nov 14, 2019 3:05 am
I have a different perspective: My experience with 2015 was that the battery would show only 96% to 98% SOC on dash display, but would have higher voltage (Leaf Spy display) after running climate control while plugged in. Therefore the battery was actually at full charge even though the dash display indicated less.
I wonder if your PTC disengaged early and it was just the heat pump preheating the car, using less power...
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2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
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goldbrick
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Re: Preheating cabin use battery

Thu Nov 14, 2019 11:11 am

^That would seem to indicate that the dash display is monitoring the voltage available to the motor, ie total battery voltage - the losses due to internal resistance. I assume the SOC display is just based on a voltage reading so if there is a load on the battery, that would drop the output voltage based on the current being drawn * internal resistance. Or something like that. I assume that is the definition of 'internal resistance' but a battery is far from an ideal voltage source so I'm a little fuzzy on all this stuff.

nlspace
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Re: Preheating cabin use battery

Thu Nov 14, 2019 4:55 pm

You were plugged in, but the EVSE was not activated.

To turn the heater ON while connected to EVSE: press the start button twice, then you should hear the contactors clack ON and the third blue light will flash. Now press climate control ON and Auto button, then press the front defrost button for max fan speed, increase temperature setting as desired. The AC button will be lit but leave it ON. If you turn if OFF the heat will turn off too. Go to the energy monitor screen to see the power go up to 5kW of heating and it will be coming from the output of the OBC.

GerryAZ
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Re: Preheating cabin use battery

Fri Nov 15, 2019 3:19 am

LeftieBiker wrote:
Thu Nov 14, 2019 4:36 am
GerryAZ wrote:
Thu Nov 14, 2019 3:05 am
I have a different perspective: My experience with 2015 was that the battery would show only 96% to 98% SOC on dash display, but would have higher voltage (Leaf Spy display) after running climate control while plugged in. Therefore the battery was actually at full charge even though the dash display indicated less.
I wonder if your PTC disengaged early and it was just the heat pump preheating the car, using less power...
No, remote activation of climate control for heating while plugged in always used PTC (probably to avoid noise from radiator fans and compressor and to reduce wear on those components). The instrumentation just displayed lower SOC percent than actual charge level (based upon voltage displayed by Leaf Spy and observations that dashboard displayed SOC percentage would not start to decrease for several miles of driving).
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019

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