first HEV/PHEV 49MI TRIP - Kia Niro Forum
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post #1 of 25 (permalink) Old 06-22-2018, 08:54 PM Thread Starter
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first HEV/PHEV 49MI TRIP

Today we drove our favorite alpine loop. 47mi with about 4000 ft elevation change.

Total miles 47
Gas range reduction 468 to 462 (net 6 used)
Battery range reduction 26 to 0
Total power used for recharge after trip measured at 8.9 KWHr
Trip history stats 47 miles, 16.7 mpg

Observations

6 gas miles plus 28 EV miles does not equal 47. (it's 34)

Recharge power of 8.9 x 95% (assumed converter efficiency) - 8.4 KW hrs. Consistent with 8.9 Max capacity and consistent with the MCU keeping a 0.5 KWhr reserve in HEV mode.

something is buggy with the trip history stats. (Kia engineering take note)
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post #2 of 25 (permalink) Old 06-23-2018, 01:25 PM Thread Starter
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Originally Posted by charlesH View Post
Today we drove our favorite alpine loop. 47mi with about 4000 ft elevation change.

Total miles 47
Gas range reduction 468 to 462 (net 6 used)
Battery range reduction 26 to 0
Total power used for recharge after trip measured at 8.9 KWHr
Trip history stats 47 miles, 16.7 mpg

Observations

6 gas miles plus 28 EV miles does not equal 47. (it's 34)

Recharge power of 8.9 x 95% (assumed converter efficiency) - 8.4 KW hrs. Consistent with 8.9 Max capacity and consistent with the MCU keeping a 0.5 KWhr reserve in HEV mode.

something is buggy with the trip history stats. (Kia engineering take note)
Did I really get 47 total - 6 gas = 41 miles on the battery?
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post #3 of 25 (permalink) Old 06-24-2018, 01:12 PM
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Originally Posted by charlesH View Post
Did I really get 47 total - 6 gas = 41 miles on the battery?
Well assuming you started and stopped in the same place you had 4000ft going up and then 4000ft back down. Probably a lot of coasting / regenerative braking on the way down.

In other words, no you probably didn't get 41 miles on the battery. A significant fraction of your miles were likely gravity powered.

I haven't done a serious hill climb in my PHEV yet, but I have definitely exceeded the estimated 26 miles on battery alone. At low speeds with some opportunity to coast you can go pretty far.

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post #4 of 25 (permalink) Old 06-24-2018, 03:09 PM Thread Starter
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Originally Posted by jmurphEV View Post
Well assuming you started and stopped in the same place you had 4000ft going up and then 4000ft back down. Probably a lot of coasting / regenerative braking on the way down.

In other words, no you probably didn't get 41 miles on the battery. A significant fraction of your miles were likely gravity powered.

I haven't done a serious hill climb in my PHEV yet, but I have definitely exceeded the estimated 26 miles on battery alone. At low speeds with some opportunity to coast you can go pretty far.
Yes, I believe you are correct. The ICE started as I neared the top of the mountain thus effectively recharging the battery on the down side of the mountain.

I now have a meter on the plug so I will know precisely how much energy I put into the car. I'm going to monitor energy in and miles driven over the next few weeks. As long as the ICE doesn't kick in, I will get a precise reading on what the miles/KWhr actually is.
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post #5 of 25 (permalink) Old 06-24-2018, 03:12 PM
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charlesH - what meter did you get?

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post #6 of 25 (permalink) Old 06-24-2018, 03:24 PM Thread Starter
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charlesH - what meter did you get?
P3 P4400 Kill A Watt Electricity Usage Monitor
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post #7 of 25 (permalink) Old 06-24-2018, 04:33 PM
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Originally Posted by charlesH View Post
Yes, I believe you are correct. The ICE started as I neared the top of the mountain thus effectively recharging the battery on the down side of the mountain.

I now have a meter on the plug so I will know precisely how much energy I put into the car. I'm going to monitor energy in and miles driven over the next few weeks. As long as the ICE doesn't kick in, I will get a precise reading on what the miles/KWhr actually is.
I'd bet heavily that the ICE barely ran at all on the run down the mountain. Unless your're in sport mode or if you need cabin heat the ICE should be off if you're coasting. I've actually seen the battery range increase after a long coast.

As to the energy you put in the car, the battery capacity is listed at 8.9kWh. I've charged at public chargers a few times and have added a maximum of 8.3kWh. My guess is you'll measure about that plus a little bit for losses in the charger. I'd guess the charger is >90% efficient, but I'm eager to see what you find.

Jim
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post #8 of 25 (permalink) Old 06-24-2018, 04:58 PM
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This sounds quite improbable. I would guess the car underestimated the initial gas range and/or overestimated the gas range at the end. 6 miles on gas at 16.7 mpg = 0.36 gallon used = equivalent of about 15 miles of gas driving.
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post #9 of 25 (permalink) Old 06-24-2018, 06:40 PM
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A couple months ago I did a 15 mile loop with steep elevation gain and loss of 2,000 feet. 25 mph whole time. I was astonished that the range remaining was exactly the same after finishing. Impossible from a physics standpoint of course. Only time I've ever maxed the battery gauge on the hybrid.

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post #10 of 25 (permalink) Old 06-24-2018, 08:38 PM
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Its not that hard...you went 47 miles and used .36 gallons of gasoline for a miles per gallon of 130.55555.

Thats fantastic. Dont over-analize it and ruin your perception.
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