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Dala's Leaf buildthread (2015 Nissan Leaf)
#21
You know the app & timer will enable you to charge to x?% and preheat/defrost (while still on charge) - which allows you to start the journey at 100% in a toasty frost free vehicle ?
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#22
Ofcourse, but I don't have any electrical outlets Sad

All the pictures are taken from my parents place, where I have experimented with timers and prewarming.

If only I had an outlet at home...
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#23
Hi Dala,

Why is it that you don't have an outlet at your apartment? Is it because you rent it electricity included? In that case I guess you bet nobody noticed you where charging you car in stead of preheating cause many Finnish ICE cars have electrical heaters as well. Smile

Anyhow, as you already said if you can neither charge at home nor at work than it is a pain in the ass.

Nice thread, I'll follow!

Regards, Rik
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#24
Anyone thought to make new battery block out of 18650 or 20700 recycled batteries. I like the idea to do an Leaf with bad battery and build it with 20700 cells of which I got heaps and love their output.
Menno
Using 7S80P pack. Building 14S40P packs.
"Tell me, and will I forget. Show me, and I may remember. Involve me, and I will understand." Confucius 450 BC
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#25
I finally caved in, and started renting a garage space 200m from the apartment. It costs 50€ per month, with unlimited electricity. This solved my range anxiety issues permanently. I am limited to 8Amp charging, but that is OK, I only need this space once or twice a week. I should have just done this from the start Big Grin


Now I can start to experiment with the timers properly before going on a long trip!

Oh, and here is a snip of a LeafSpy screenshot, showing the consumption during prewarming.


On 21*C, with fanspeed on 2, it makes the cabin nice and warm in a matter of minutes. Consumption hovers between 1500-1800W in this state. Green is going in, red out.

With the 16A charger (3300W), you can charge the battery and still preheat the cabin. Awesome!
With a 8A charger (1600W), if you preheat, all electricity will be pulled from the battery, and the charger barely keeps up replenishing it.

Some people on the nissanleaf forums have even reported SoC dropping a few % when preheating, this is probably only in USA where they have only 110V, and a normal L1 charger would only output 1000W+-200W. Thanks EU for 240V Smile

(01-03-2019, 12:46 PM)RikH Wrote: Hi Dala,
Why is it that you don't have an outlet at your apartment? Is it because you rent it electricity included? In that case I guess you bet nobody noticed you where charging you car in stead of preheating cause many Finnish ICE cars have electrical heaters as well. Smile

Yeah, no parking spaces available, need to get on a multi-year waiting list for the apartment. Workplace also told me to wait for 2022, when they complete the new facilities. LOL

(01-08-2019, 01:05 AM)Menno Wrote: Anyone thought to make new battery block out of 18650 or 20700 recycled batteries. I like the idea to do an Leaf with bad battery and build it with 20700 cells of which I got heaps and love their output.

That would theoretically work, but the currents involved would limit you to only using new cells for safetys sake. Since you have no control of charge/discharge currents. Also the shunts are so shitty, so a change in chemistry would be more noticeable. Maybe if you replace all cells with 18650 it would work better.
stevelectric, jdeadman, Korishan And 1 others like this post
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#26
This showed up in the mail.



Now I can start capacity testing the big Leaf cells! I settled on the reasonably priced Antimatter charger/discharger. It can do 10A charge and 7A discharge. I started it a bit more gently, and the test is going to take some time. I set the upper voltage to 4.1V, and discharge down to 3.0V. If I had set the upper voltage to 4.2, it would ofcourse net more capacity, but as long as I do the same for each cell I test, I will come to a conclusion what cell would be best to use in the car.

My reasoning for 4.1v instead of 4.2v, it's just what the Leaf BMS targets for optimal cell lifetime.
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#27
I now have some capacity numbers to share, and time to make a decision.
Test, 5Amp discharge, from 4.1V -> 3.3V
USA cell: 39,77Ah
Italy cell: 43,30Ah

So presuming I have an USA cell from the same batch, If I upgrade to the Italy cell, I'd get a 9% range increase! I could also try looking for better cells, but most people just sell untested cells :/ Hmm...
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#28
(01-08-2019, 05:58 PM)Dala Wrote: I finally caved in, and started renting a garage space 200m from the apartment. It costs 50€ per month, with unlimited electricity. This solved my range anxiety issues permanently. I am limited to 8Amp charging, but that is OK, I only need this space once or twice a week. I should have just done this from the start Big Grin


Now I can start to experiment with the timers properly before going on a long trip!

Oh, and here is a snip of a LeafSpy screenshot, showing the consumption during prewarming.


On 21*C, with fanspeed on 2, it makes the cabin nice and warm in a matter of minutes. Consumption hovers between 1500-1800W in this state. Green is going in, red out.

With the 16A charger (3300W), you can charge the battery and still preheat the cabin. Awesome!
With a 8A charger (1600W), if you preheat, all electricity will be pulled from the battery, and the charger barely keeps up replenishing it.

Some people on the nissanleaf forums have even reported SoC dropping a few % when preheating, this is probably only in USA where they have only 110V, and a normal L1 charger would only output 1000W+-200W. Thanks EU for 240V Smile

(01-03-2019, 12:46 PM)RikH Wrote: Hi Dala,
Why is it that you don't have an outlet at your apartment? Is it because you rent it electricity included? In that case I guess you bet nobody noticed you where charging you car in stead of preheating cause many Finnish ICE cars have electrical heaters as well. Smile

Yeah, no parking spaces available, need to get on a multi-year waiting list for the apartment. Workplace also told me to wait for 2022, when they complete the new facilities. LOL

(01-08-2019, 01:05 AM)Menno Wrote: Anyone thought to make new battery block out of 18650 or 20700 recycled batteries. I like the idea to do an Leaf with bad battery and build it with 20700 cells of which I got heaps and love their output.

That would theoretically work, but the currents involved would limit you to only using new cells for safetys sake. Since you have no control of charge/discharge currents. Also the shunts are so shitty, so a change in chemistry would be more noticeable. Maybe if you replace all cells with 18650 it would work better.

I am only using one type when building a pack. So Panasonic 20700A or Samsung 21700-40T. The 18650 I get are for my power wall. Which is being build in packs of 14S40P from only one type of cell per pack.
Dala and LEDSchlucker like this post
Menno
Using 7S80P pack. Building 14S40P packs.
"Tell me, and will I forget. Show me, and I may remember. Involve me, and I will understand." Confucius 450 BC
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#29
Thank you...interesting read and very precise and concise presentation of events. Welldone!!!
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#30
(02-10-2019, 04:16 AM)Shiamaru Wrote: Thank you...interesting read and very precise and concise presentation of events. Welldone!!!

Thanks Smile

Status update on the Leaf. It's been cold here, but it's finally turning now.

I assembled the OpenEVSE unit. Now I need to decide where I mount it. I will most likely make it open to the public, since it probably goes in the middle of nowhere Big Grin


We have also had a fair bit of snow Big Grin


Due to all the cold and snow, I decided to get some proper snowtires instead of the all-season ones that came with the car.

I settled on "Nokian Hakkapeliitta R3"
in the format: 205/55 R 16 94 R XL


This is the tyre that Nokian primarily reccomends for electric cars, since it's a low rolling resistance and wont impact the range. On the sticker they are branded as B on the economy gauge. The efficiency step between A - B - C goes something like 100% - 97% - 90%, so there is a huge benefit from stepping up from C to B. From B to A the 3% effiency step is not as noticeable.
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