roperld
Well-known member
When does the battery heater operate? Is it only during charging or some other situation?
bradbissell said:Turns on when the battery reaches -4F and then turns off when the battery reaches 14F. I believe I read in the user manual that it works when charge is >30% or plugged in.
The range loss you are experiencing during cold weather above -4°F is not due to the battery heater turning on. It is because cold batteries do not deliver the same Wh as do warmer batteries. 2011 LEAFs did not have a battery heater, and they experience the same range loss due to battery temperature as do the 2012s.WhiteBearLake said:The owners manual might indicate that the battery heater comes on at -4F, but my experience doesn't seem to agree.
I don't know of any way to 'see' battery heater current draw so I have no facts to support my observations.
It seems to me that on colder days, perhaps in the 0F to 10F days, that there is a significant unexplained loss in driving range. I have tried to keep climate control use to a minimum and I use the seat heater and steering wheel heater almost consistently. I don't think that my climate control use could account for the large change in driving range so I have often wondered if the battery heater comes on proportional to the outside temperature. The owners manual implies that it is either full on or full off. I don't think the battery warmer shows up on any of the gauges.
Anyone know more about this?
The temperatures are battery pack temperature not ambient temperature. The battery pack has a very large thermal mass so it takes a long time to warm-up or cool-down.WhiteBearLake said:The owners manual might indicate that the battery heater comes on at -4F, but my experience doesn't seem to agree.
ebill3 said:The range loss you are experiencing during cold weather above -4°F is not due to the battery heater turning on. It is because cold batteries do not deliver the same Wh as do warmer batteries. 2011 LEAFs did not have a battery heater, and they experience the same range loss due to battery temperature as do the 2012s.
Charging generates some heat, so some folks in the colder climates try to schedule charging to complete just before morning departure. Discharging also generates heat.
That seems like a very odd and, to me, unlikely assertion. First, I'm going to assume you mean kWh rather than kW.LakeLeaf said:I think it's also true that cold batteries take more kW to charge to the same level as warm batteries?
kikngas said:The owners manual actually says that the energy bars (and presumably the SOC indication) will adjust as the battery temp changes. So if you are showing 10 energy bars with a cold battery and then things warm up, it may slide to 9. And conversely, as battery gets colder, the number of charge bars may move upward, since the charge the battery is able to hold is reduced in the cold, the battery is already closer to full capacity (i.e. show more bars) than when it was warmer.
LeafSwe said:I've also read that in the manual. What happens if i fully charge the battery in the garage at 20 celcius(68F) and then move the car outside at -20 celcius(-4F) and let it stay for some days?
Will the voltage and SOC increase over max(4.11)?
johnrhansen said:-4 degrees F? You mean there are places where people live that get that cold?
gossett said:I have been told by Nissan that the new 30kWh battery in the 2016 Leaf does not have the battery warmer, but they would not tell me why it was removed. I live in Minnesota, so I find this lack of information disturbing. Does anyone know why that feature has been removed?
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