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How to Improve Winter MPG's

winter mpgs

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148 replies to this topic

#141 OFFLINE   ptjones

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Posted 03 January 2018 - 03:12 PM

Under those conditions you really need block/ oil pan heaters to have a chance of getting enough heat in the ICE to turn it off. :sad: In my opinion all Hybrids should come with block heaters standard.  

 

Paul









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#142 OFFLINE   fbov

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Posted 03 January 2018 - 06:36 PM

+1

 

I found this graph below which shows how a Li Ion SOC varies with temperature.  Basically, at low temperatures the usable capacity of the battery declines significantly and depends on discharge rate. So, the algorithms will likely limit the amount of discharge resulting in ICE running more at low temperatures.  The battery symbol gauge may show a very high SOC, but in reality there is very little usable SOC and ICE will run more than at a higher temperature.

 

attachicon.gifCapture.PNG

Great data. Note the chart is in Celsius; -20C is -4F.

 

We're about to get a spell of sub-zero this week. I remember from two years ago what it's like driving with a cold HVB. This chart shows why sub-zero is a special case, where our EV systems can't function. Note this is for discharge; no charging below 32F. 

 

Have fun,

Frank



#143 OFFLINE   ptjones

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Posted 03 January 2018 - 06:41 PM

+1

 

Great data. Note the chart is in Celsius; -20C is -4F.

 

We're about to get a spell of sub-zero this week. I remember from two years ago what it's like driving with a cold HVB. This chart shows why sub-zero is a special case, where our EV systems can't function. Note this is for discharge; no charging below 32F. 

 

Have fun,

Frank

That's brutal. :sad:  I don't know if having a heater inside the car is going to help much.

 

Paul



#144 OFFLINE   joshg678

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Posted 03 January 2018 - 09:49 PM

That's brutal. :sad:  I don't know if having a heater inside the car is going to help much.

 

Paul

I was considering a space heater in front of the car and one inside lol.

 

I do think i will be buying the oil pan heater though.  How long do you leave yours on for Paul?



#145 OFFLINE   raadsel

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Posted 04 January 2018 - 07:55 AM

I was considering a space heater in front of the car and one inside lol.

 

I do think i will be buying the oil pan heater though.  How long do you leave yours on for Paul?

 

I recall one person, posting on another forum, mentioning that he adapted an electric blanket to sit on top of the battery and keep it warm. I believe he stated he toyed with the idea of a space heater but discarded the idea as there was too much risk.



#146 OFFLINE   obob

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Posted 04 January 2018 - 10:36 AM

Some winter notes:

 

I have/had a strap on seat warmer.  I was not very careful to keep it unwrinkled.  Well it shorted out and something melted plastic onto my seat and/or the seat was scortched a bit.

 

If I had a garage to keep my car in I probably would check for wind leaks.  If it is an attached garage it has warm walls.  I recently bought an old house and am finding ways to stop some of the cold air leaks.

 

And these external faucet covers seem to work well to stop cooling the pipes in the house or garage: https://www.homedepo...-1981/204759083


Edited by obob, 04 January 2018 - 01:59 PM.

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#147 OFFLINE   Bill-N

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Posted 05 January 2018 - 11:46 AM

 

And these external faucet covers seem to work well to stop cooling the pipes in the house or garage: https://www.homedepo...-1981/204759083

 

Since we're drifting a bit off topic, I've found bubble wrap held on with bungie cords (or the ever-popular duct tape) also works.


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#148 OFFLINE   joshg678

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Posted 05 January 2018 - 11:47 AM

I put tape over my top grill today, High of 15 Estimated for today.

I think there was a difference, my WT was up to 170 this morning when i got to work, but only got 42mpg.


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#149 OFFLINE   ptjones

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Posted 14 January 2018 - 11:08 AM

This morning at 9AM temps were only 22*F Brrr. sad.png  And got 48mpg going 7 mi. to work.  Started with 44% SOC, 85*F WT, garage was 49*F and ended up with 40% SOC.

 

Paul








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