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Old 11-13-2013, 11:30 AM   #1 (permalink)
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Hello members. Cold Weather has hit the Carolinas (below freezing last evening and forecasted for the next couple of nights). On my drive to work this morning, it was a crisp 27 degrees. I know we have members in DC/Atlanta/NY/Chi/Denver/Washington, etc). Therefore, I thought it may help to share with everyone the Cold Weather Charging Consideration (source -Fisker Owner Handbook):

"Do not allow the vehicle to remain in temperature extremes for long periods without being driven or plugged in. When not operating the vehicle it is recommended that the vehicle be plugged in and charging when temperatures are below 32 degrees F (0 degrees C). Note: Keep the vehicle plugged in, even when fully charged, in order to keep the battery temperature prepared for the next drive. This is important when outside temperatures are extremely cold.

Stay warm (both all of you and your awesome Fiskers).
Please feel free to share any other cold weather advice or tips/tricks to keep our vehicles safe and sustainable.

maybe the mods can add this to the first post?

810120054.01 Vehicle Storage Guidelines.pdf 69 KB

https://mega.co.nz/#!2Y4gxZzb!Sf9HVz...RFQ41fGHAhaedg

890120045.01 Karma Battery Maintenance and Storage Guidelines.pdf 77 KB

https://mega.co.nz/#!LYI1CQBL!LMNeZ1...UD5rIO-1IFeOIc

Last edited by Fabulist; 11-14-2013 at 03:08 PM. Reason: Merge Requested by 8AVGMPG
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Old 11-13-2013, 01:44 PM   #2 (permalink)
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If you're going to leave it plugged in for an extended period of time to the charger, get yourself a trickle charger for the 12V Battery as well.



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Old 11-13-2013, 01:49 PM   #3 (permalink)
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or leave the 12v disconnected
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Old 11-13-2013, 02:01 PM   #4 (permalink)
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What's the point of plugging it in then?



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Old 11-13-2013, 02:59 PM   #5 (permalink)
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The HV PTC heater is mainly for when the vehicle is being operated on exclusive battery power (ICE is off) and does not turn on when the vehicle is plugged in and the contactor is open. The only negative of storing batteries at cold temperatures is cold soak (which is temporary). Li-Ion batteries are best preserved being stored in cold weather. It is hot weather that is far more damaging to Li-Ion batteries. Here is a great paper on the topic:

http://ma.ecsdl.org/content/MA2011-02/17/1282.full.pdf
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Old 11-13-2013, 04:47 PM   #6 (permalink)
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but what does the ptc heater have to do with plugging it in?
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Old 11-13-2013, 05:09 PM   #7 (permalink)
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My post about the trickle charger was simply to help those owners that would like to follow what the Owner's Manual says. For roughly a $40-$60 investment, it'll save you a lot of headache. Case in point, a client of mine put a trickle charger on his car when he stored it back in May. Now in November he returns to California, takes the car off the trickle charger and it immediately starts right up. Without the trickle charger, I can almost guarantee he'd have come back to a dead car.



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Old 11-13-2013, 06:17 PM   #8 (permalink)
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Lormax/Harley: if we want to top off our 12 V batteries during the winter by simply turning the Karma on in our garage and letting the HV battery charge the 12 V battery, how long should we let the car idle to ensure the 12 V is fully charged?

Thanks!
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Old 11-13-2013, 06:30 PM   #9 (permalink)
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20-30 minutes every 1.5-2 weeks. Open the garage door in case the ICE fires up.
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Old 11-13-2013, 06:33 PM   #10 (permalink)
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Quote:
Originally Posted by 8AVGMPG View Post
but what does the ptc heater have to do with plugging it in?

The HV PTC circulates coolant to keep the battery warm (if necessary) but turns off once the contactor opens up (i.e. full charge). Once this occurs you will not be circulating any warm coolant so it is useless to plug in. The main problem is leaving the battery at a high SOC for a long period of time (caused by plug in since you cannot set SOC thresholds in the Karma). Why not just charge the battery to a 50% SOC and unplug the 12v and be done with it? What is the benefit of leaving the car plugged in and putting a trickle charger on the 12v for months at a time? So you don't lose your radio presets maybe? Long term this could lead to HV battery degradation.
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