lorenfb said:Hi Greg,
On the first page of the LeafDD which displays voltage ticks (the 1st being 340) also indicates the charging
current (starting from the right) above the voltage ticks. Or is this, though, really instantaneous kW based on
this statement from the LeafDD guide?
"Above all of this is the instantaneous current draw (or charge) to the battery. Discharge grows from the left side,
charge grows from the right. The photo shows my 2012 charging at 3.3kW.".
So is the display indicating instantaneous charging current (amps) or instantaneous charging power (kW)?
The 1st tick appears to be offset from the right of the last possible right display segment which would be
330 if it were displayed. The charging current (or kW) appears to begin from this far right point. Given this,
what can one assume as the charging current (or power) between ticks? When charging my Leaf at 5kW,
the indication is about half way between the 330 (if it had a tick) and 340.
Thanks for your insight.
Paqo said:How do you like my way of finding the right place for DD display
Stanton said:Paqo said:How do you like my way of finding the right place for DD display
I like it! Details please?
Looks like you removed the airbag lights/display...what did you do with it...and how about cable routing?
Nice work!Paqo said:How do you like my way of finding the right place for DD display
Paqo said:Stanton said:Paqo said:How do you like my way of finding the right place for DD display
I like it! Details please?
Looks like you removed the airbag lights/display...what did you do with it...and how about cable routing?
Actually it's hanging behind console as I found it not too much needed
and it is very easy to route cable behind console
I have used small piece of plexi glass - I used hot gun glue
DD unit fits perfectly behind.
I also solder extra switch and I have place it under console so it can be almost not visible.
Very nice indeed!drees said:Nice work!Paqo said:How do you like my way of finding the right place for DD display
GregH said:Very nice indeed!drees said:Nice work!Paqo said:How do you like my way of finding the right place for DD display
btw, the power graph on the top of page 1 is actually just battery current, not actual calculated power.
The stock LeafDD never calculates power (V*A) although I have a version that ditches the Gid% option for a big power (kW) number.
The battery current from the car is only 0.5A resolution (lame!) but oversampled at (I think) 100Hz.. so the LeafDD does a little averaging to get a faux 0.1A resolution for the page 2 number.
It looks from the code like the raw 0.5A resolution number is shifted right twice (ie /4) and then either positive or negative graphed from the right or left side for the page 1 graph.
So the screen is 128 pixels wide thus a max current of 256A at 2A per dot.
lorenfb said:Since the voltage is essentially constant, one can also consider that graphic as representing
instantaneous power (kW) or instantaneous HP. That graphic basically 'follows' the Leaf's
display graphic of power as one might expect since;
Power (kW) = Voltage (constant ~ 395/385) X Current (varying based on load or regen).
"So the screen is 128 pixels wide thus a max current of 256A at 2A per dot."
So when cruising at about 45 mph the display is about 10% of full scale (256 amps) or about
26 amps. Assuming a voltage of 390 would yield about 10kW or about 13 HP, which is also
one dot on the Leaf's power display. This somewhat correlates with the input power one might
expect from the Leaf's rolling resistance and drag (minor at 45 mph).
GregH said:lorenfb said:Since the voltage is essentially constant, one can also consider that graphic as representing
instantaneous power (kW) or instantaneous HP. That graphic basically 'follows' the Leaf's
display graphic of power as one might expect since;
Power (kW) = Voltage (constant ~ 395/385) X Current (varying based on load or regen).
"So the screen is 128 pixels wide thus a max current of 256A at 2A per dot."
So when cruising at about 45 mph the display is about 10% of full scale (256 amps) or about
26 amps. Assuming a voltage of 390 would yield about 10kW or about 13 HP, which is also
one dot on the Leaf's power display. This somewhat correlates with the input power one might
expect from the Leaf's rolling resistance and drag (minor at 45 mph).
I agree the current is a good approximation of power even though not technically the same.
As you note by the little graphic notch just below the current meter on the right (above the temp)
the pack voltage does move with current (and of course SOC) so I don't know that I'd say voltage
is constant.. but at least close enough for your purposes.
JeremyW said:H on the LeafDD is "Hx" everywhere else.
They are the voltage and pilot current capability as seen by the on board charger. The 2011-2012 models will charge at 16 amps at 240v as long as the pilot is 16 amps or greater. At 208V it will draw around 18 amps.
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