Japan website list PTC option (pack temp control) ? 5kw

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kmp647

Well-known member
Joined
Jul 27, 2010
Messages
1,136
Location
Northern Virginia
Part of cold weather pack. Seat heaters and such
what is interesting is it is listed as 5kw
http://ev.nissan.co.jp/LEAF/OPTION/



5kw is beyond the 16a 240 circuit and above the 3.3kw charger circuit so..........

Possible it uses a combo of the Japanese charger cords power and pack power,

or, in Japan if you have cold pack you must have upgraded EVSE


Now in the USA the aero evse would supply 5kw to the PTC and some additional juice the the pack for charging

no way the PTC would work on the trickle cord unless the PTC is capable of using pack power

Heating the cells but reducing charge.

ideas?
 
PTC = Positive Temperature Coefficient.

It's the cabin heater, located under the hood, roughly under the 12v battery.
Maybe the 5KW one is an optional larger upgrade?
 
I'm still working thru the service manual sections, but so far have only found one reference to PTC - and it's the positive temperature coefficient cabin heater element. The 5kW PTC cabin heater is computer controlled and powered directly from the high-voltage pack wiring.
 
That's so it can heat the water quickly, not the most efficient system but easy to implement. One of the reasons the LEaf has a higher weight, many fluids, pumps, cores, valves, etc.
 
Electric heaters are 100% efficient. :)

Running it from HV makes a lot of sense, since you don't want to include a 5kW DC/DC converter. Bringing HV into or near the passenger compartment is probably not a good idea. Best that it stay on the far end of a fluid loop, so you can still recirc cabin air.
 
So, is it just a 13-amp load (approx.) switched on and off quickly to give a "low-heat" setting, or are there several (many) 500-watt "Resistors" (heating elements), with sometimes many and sometimes fewer "connected" to the traction battery to provide the variable-heating power needed?
 
Finally found out what PTC stands for. Positive temperature coefficient

It is a ceramic type electric heater element
Uses no water it element to air

Lexus uses them in 2 models to provide cabin heat before the ICE warms up

They put this secondary heater element on top of the water heater core unit and put 12v thru it to provide 500 watts of heat to the cabin/windshield def

Uses a honeycomb material

So seeing that the cold package on the japan website list: heated steering wheel (nice)
Heated seats, heated REAR seat cushion, and 5kw PTC

Maybe a totally different heater , no water based system

Be nice if we could get some real info from Nissan
 
kmp647 said:
Finally found out what PTC stands for. Positive temperature coefficient

It is a ceramic type electric heater element
Uses no water it element to air
<snip>
Sorry kmp647 - Groundloop nailed it in post #2. It's not the battery heater, and not a ceramic air heater. :(

Service Manual, HA (heating and AC), page 66:
heater.jpg


An earlier schematic shows four computer-controlled heating elements inside the water heater box.
 
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