Kona EV heat & ac on @ the same time

electriceddy said:
It was so humid this morning that the dash display was fogged up. Couldn't find anything in the manual about that one but running the car for 5 minutes with the heat pump only cleared up everything.
Click to expand...
How do you make sure only the heat pump operates and not the resistive heater?
 
synergism said:
How do you make sure only the heat pump operates and not the resistive heater?
Click to expand...
Turn the fan low (2 notches max) and temperature down (I usually have it set to 22C but I will lower it to 20C or less), the sensor will reduce the consumption after a minute or two.
If its really foggy I will operate high fan only on the windshield with minimal heat once the car is up to temperature. (keep pushing those buttons till I get want I need)
But this is Vancouver Island, not Calgary- your situation will be different.
 
apu said:
I am pretty sure there is a resistive heater in addition to the heat pump in my Canadian Kona.
Click to expand...

It seems like there would have to be a resistive heater. At extremely low temperatures, a heat pump is quite inefficient.
 
ericy said:
It seems like there would have to be a resistive heater. At extremely low temperatures, a heat pump is quite inefficient.
Click to expand...
I can usually hear the heat pump and gurgling in ac plumbing , seems like the cross over is around -5C. in extreme cold like -20C the pump is silent and you see a pretty instant climb in electrical consumption upwards of 5Kwh consitent to PTC behaviour.
 
That's interesting and it does make sense. I would assume my Irish-spec 2018 Kona has a PTC as well since I have the HP, will have to look for it under the hood.
 
I have observed consumption of 4+ kW in cold conditions (as well as smell of a resistance type heat element) a couple of times. In my case I lowered the temperature and most importantly lowered the fan speed to 2 notches as the consumption reduces to 2kW or less. Possible indication of an in duct sensor to regulate the heat.
 
ICE vehicles are better at maintaining relatively dry environment because of the engine and exhaust heat that's drying up the air. Electric vehicles need extra kick from the AC to sustain the moist at the right levels. I'm not sure what's the issue that the AC is running?
 
Murry said:
ICE vehicles are better at maintaining relatively dry environment because of the engine and exhaust heat that's drying up the air. Electric vehicles need extra kick from the AC to sustain the moist at the right levels. I'm not sure what's the issue that the AC is running?
Click to expand...
I'd say that the issue is reduced range..
 
AC has ridiculously low consumption. And turning it OFF should affect the range with only a few miles. Not worth being in a humid foggy environment for that. It was engineered this way for a reason.
 
Murry said:
AC has ridiculously low consumption. And turning it OFF should affect the range with only a few miles. Not worth being in a humid foggy environment for that. It was engineered this way for a reason.
Click to expand...
It depends on temperature.. On a hot and humid day here in Florida, the AC will reduce range by 10% or even more..
On a very hot day, I have seen the reduced range as high as 15%.. Now, combine that with the reduced range due to heater use, you may end up with 35 to 40% reduced range if both of them are on at the same time. On a side note.. I may need the A/C in the next couple of days.. 80 to 86F (27 to 30C) forecasted high for the next 7 days... Record breaking heat for January..

Screenshot_20200109-103633_Chrome.webpScreenshot_20200109-103935_Chrome.webp
 
Last edited:
I'm certain the HP-equipped Kona is perfectly capable of dehumidifying using cooling and reheat, just like on an ICE car and just like any building HVAC. It's not like a highwall type heat pump where it has to cycle between heating and cooling because it can't do both at the same time. Here are the two components that do this.

Kona HVAC.webp
 
When the temperature and moisture level outside are greater than inside the car, moisture will condense on the exterior of the car glass. Similar to the situation when it’s colder outside than the inside of your car, the goal is to change the temperature on the inside of the car to match the outside temperature.
 
You must log in or register to reply here.
Back
Top