goldbrick
Posts: 915
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Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 10:25 am

rasgaroo wrote:
Fri Aug 07, 2020 5:29 am
A guy at a local not-so-authorized nissan service center :) . His reasoning was like that there is a bunch of things the car needs to do with the battery circuit when it is about to stop charging, and if you stop charging without 'informing' the car first, the car wouldn't have enough time to do all those things, which can eventually be bad for the battery. It's fairly possible that he made it up on the spot! :)
This may be true in a very superficial way but the connection to the car's charger is AC and there is an AC to DC converter inside that buffers the battery from the power connection. And yes, there are probably things this charging circuit needs to do in sequence to terminate the charge. I'm an EE but not an expert on high power chargers but my best guess is that this sequence of steps would probably take a matter of msec's (1000th's of a second) to execute. There is no harm to stopping charging by pressing the lock lever. Flipping the breaker is a much, much worse option and honestly, if it were me, I'd replace that breaker just as a precaution.

alozzy
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Location: Vancouver, BC
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Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 11:56 am

You are worrying needlessly about the state of charge. As long as you don't have the car sitting around, particularly in the heat, at 100% SOC then you're good. I personally wouldn't worry about my LEAF sitting for days at 80% SOC or less, I doubt it does any harm to the pack.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
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cwerdna
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Location: SF Bay Area, CA

Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 12:06 pm

alozzy wrote:
Fri Aug 07, 2020 11:56 am
You are worrying needlessly about the state of charge. As long as you don't have the car sitting around, particularly in the heat, at 100% SOC then you're good. I personally wouldn't worry about my LEAF sitting for days at 80% SOC or less, I doubt it does any harm to the pack.
You're in a mild climate that is perfect for Leaf batteries.

Notice the OP's sig says "Lives in a tropical country (temp. around 85F/30C)." I suspect that is the kind of temp he sees year round. Some places don't cool down much at all nor at night. That isn't good for Leaf batteries.

(Not that the OP is in Singapore, but Google for singapore average weather for an example of constantly warm. Average high temps all year are no lower than 87 F (31 C) and average low temps are no lower than 76 F (25 C).)

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alozzy
Posts: 1576
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Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 12:44 pm

That does make a difference. I still don't understand why anyone who lives in a hot climate chooses a LEAF in the first place, but to each his/her own I guess.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV :D

cwerdna
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Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 12:59 pm

I found one of the OP's old posts at viewtopic.php?f=27&t=31173&p=586798#p586798 that says
"Note: I live in the tropics. We don't have seasons. It's always around 80 - 86 degrees (27C - 30C). All leaf cars here show exactly 6 temperature bars all the time."

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DougWantsALeaf
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Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 1:02 pm

I don't think 86F counts as hot in Arizona. That's sweater and heavy Jeans weather.

True tropics where its 80-90F and on an island is perfect Leaf Gen 1 space. Rarely need to go more than 50 miles unless your are a cab, in which case buy a Gen 2 Leaf.
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cwerdna
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Location: SF Bay Area, CA

Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 2:08 pm

DougWantsALeaf wrote:
Fri Aug 07, 2020 1:02 pm
I don't think 86F counts as hot in Arizona. That's sweater and heavy Jeans weather.

True tropics where its 80-90F and on an island is perfect Leaf Gen 1 space. Rarely need to go more than 50 miles unless your are a cab, in which case buy a Gen 2 Leaf.
In terms of the temps, they are pretty terrible for gen 1 Leaf. We've heard of bad degradation in Hawaii on gen 1 Leaf.

My guess is because instead of having only 3-5 months of warm weather and where it does cool down at night (like in my city), it's all year round. The Leaf battery never gets a chance to cool down at all and thus degrades badly.

For example, in my city, even on hot days (e.g. 90 F or more), it is almost unheard of to have stretches of even 2 days where the low temp for the day is 70 F or more. It'll cool down to below 70 F. For my city this week, it's forecasted to hit highs of mid-80F and lows of between 59 and 63 F. I can move my Leaf outside overnight to get the battery cooler. In the morning, when I move it into the garage, batt might be between 65 and 72 F per Leaf Spy.

And, per Google, the coldest month for me is Dec with average high of 59 F and average low of 42 F.

All of the above is in impossible in a place where the low temp is 80 F, at best.

But yes, Arizona is crazy hot with many months of highs of above 100 F every day and lows of no lower than 80ish or 90ish F. But, they eventually have cooler months too. Google for phoenix average weather then click on all months to see what I'm talking about vs. honolulu average weather. And again, we've seen bad degradation in HI.

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goldbrick
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Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 5:36 pm

I remember spending time in Singapore and the temp at night is about the same as the temp during the day. The humidity is also about the same and the only real difference is the sun. So I'd expect a Leaf battery in Singapore to stay at a constant 90+ F unless it spent a lot of time in a AC cooled garage in which case the owner could probably afford a new one every year, even with Singapore's $$$$$$ taxes on cars.

cwerdna
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Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 5:40 pm

goldbrick wrote:
Fri Aug 07, 2020 5:36 pm
I remember spending time in Singapore and the temp at night is about the same as the temp during the day. The humidity is also about the same and the only real difference is the sun. So I'd expect a Leaf battery in Singapore to stay at a constant 90+ F unless it spent a lot of time in a AC cooled garage in which case the owner could probably afford a new one every year, even with Singapore's $$$$$$ taxes on cars.
Indeed. Cars are CRAZY expensive in Singapore due to the (from what I understand) their certificate of entitlement crap. https://insideevs.com/news/349462/nissa ... singapore/ is probably right. Looks like Leaf didn't arrive there until 2019.

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rasgaroo
Posts: 13
Joined: Tue Jun 09, 2020 8:03 pm
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Re: Limiting charge to LESS than 80%

Fri Aug 07, 2020 5:46 pm

It's not as hot as in Singapore, but close. At night the temperature goes down to around 75 - 80 degrees. In the midday, it's around 82 - 86 degrees. I have never seen a leaf here that is lower or higher than 6 bars.

For some reason, probably because of the wolf and lizard battery packs, 2014 and 2015 leafs do much better around where I live. I have never seen a 2013 leaf around here that has higher than 5 battery bars these days. Almost all 2014/2015 cars still have around 8 - 11 bars.
Owns a Nissan leaf 2014. Lives in a tropical country (temp. around 85F/30C).

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