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80% Charging on 2014-17 LEAF

Posted: Wed Jan 25, 2017 3:06 am
by reeler
I just upgraded to a 2016 LEAF and hate charging to 100%. I leave a car for business in DC and only visit one week a month. I hate that the car might be left soaking at a full charge.

It is common knowledge that this is bad for modern battery chemistry and that Nissan removed the feature when regulators reduced the range given the recommendation to only 80% charge. My Bolt has a Hill Top Mode that only charges to 90% so you have full regen down the mountain, but everyone knows that this is the long life mode. Tesla avoids the issue by letting you charge to any amount you like and gives no recommendation.

Perhaps there is an App that can query the state of charge while plugged in and tell the car or the charger to stop charging? Is there such a thing?

Re: 80% Charging on 2014-17 LEAF

Posted: Wed Jan 25, 2017 5:12 am
by LeftieBiker
The lack of charge limit options is one reason the 2017 Leaf isn't high on my list, even though I like my 2013 SV, with 80% charge option. The others are:

* Terrible high beams still not fixed.

* No minor fixes, either, AFAIK. The wheel heater is still too hot followed by too cold, the 12 volt battery may or may not become an issue (it will if you leave it plugged in but not charging), they haven't tweaked the power output since 2013, and there still isn't an optional spare, even though they offered one in Australia for a while.

Re: 80% Charging on 2014-17 LEAF

Posted: Fri Jan 27, 2017 6:49 am
by bongo2
One thought that I had is to use the end-time on the Leaf timer along with a timer on the EVSE to achieve roughly 80% charging. If your EVSE has a plug you can use a a 220v timer to cut power at, say 7am. If you set the Leaf to end charging at 8am (experimentation will be required) then it should up with something like 80% charge. I haven't been able to try this becuase I don't have my Leaf or EVSE yet, but it seems like it should work. It's really a shame they took away this option and make you jump through hoops to get this result.

I won't be doing this in the winter when I'm more concerned about how to get a reasonable range with a 100% charge, but in the summer I might give this a try.

Re: 80% Charging on 2014-17 LEAF

Posted: Fri Jan 27, 2017 7:36 am
by SageBrush
It is easier than that, bongo2

Amount_to_charge divided by power = charge_time

Re: 80% Charging on 2014-17 LEAF

Posted: Sat Jan 28, 2017 6:57 am
by bongo2
I have an S which I don't believe has a direct way to set the charge time. But for OP it will be simpler.

The most annoying thing to me about base model anything is when they intentionally hobble them to encourage people to pay more. There is no cost savings to Nissan for not having the same start and stop function for the model S. Oh well, everyone does it.

Re: 80% Charging on 2014-17 LEAF

Posted: Sat Jan 28, 2017 6:47 pm
by arnis
It is possible to do tricks to stop charging before 100%.
Either mess with end timer and add EVSE power cutout relay (another timer).
Or add relay that takes pack voltage as input data and once voltage tips over lets say
390V it will cut J1772 signal pin.

But from Nissan, it was very stupid. No regen every day. They are idiots, lets be honest.

Re: 80% Charging on 2014-17 LEAF

Posted: Sat Jan 28, 2017 7:53 pm
by SageBrush
arnis wrote: But from Nissan, it was very stupid. No regen every day. They are idiots, lets be honest.
And your opinion of the owners who find a little mental arithmetic too difficult* ?
You could always make a handy table you keep in the car.

The only annoyance here is changing the start time if the initial SOC is different than your last charge <<shrug>>

* E.g., my car adds one bar of charge every 15 minutes on my 6.6 kW (delivered) EVSE.

Re: 80% Charging on 2014-17 LEAF

Posted: Sun Jan 29, 2017 5:52 am
by ltbighorn
Having to change your start timer every day (if you start charge varies regularly) in order to have regen when you depart is undeniably pretty stupid.

The start timer approach doesn't even work if you have irregular departure times, as I do. Luckily I was aware of the limitations when purchasing an EVSE and bought one that can add a fixed number of kWh, or a fixed time. It's still stupid to have to input it each time, but it's better than nothing.

Re: 80% Charging on 2014-17 LEAF

Posted: Sun Jan 29, 2017 6:35 am
by arnis
ltbighorn wrote:Having to change your start timer every day (if you start charge varies regularly) in order to have regen when you depart is undeniably pretty stupid.

The start timer approach doesn't even work if you have irregular departure times, as I do. Luckily I was aware of the limitations when purchasing an EVSE and bought one that can add a fixed number of kWh, or a fixed time. It's still stupid to have to input it each time, but it's better than nothing.
Exactly. I use my car for individual driving pattern. If I did the same trip for the whole year I would use public transportation system or something.
I depart randomly. I arrive randomly. I want to leave my car, plug it in within 6 seconds and that's all. No more than 10 seconds for
stupid things. I want to live. I don't want to manage small things for no reason.

If I was stuck in this 100% problem I would definitely build Arduino or just relay based system that cuts pilot signal when pack voltage goes
up to 393V.

Re: 80% Charging on 2014-17 LEAF

Posted: Sun Jan 29, 2017 8:14 pm
by reeler
Wouldn't it be easy enough to have an IFFTT script that could ping the LEAF for state of charge and command a ChargePoint Home adapter to turn off once it hits 80%. ChargePoint could put this into their app too easily enough.