Limey
Posts: 149
Joined: Wed Jun 05, 2013 8:18 am
Delivery Date: 24 May 2013

Mod the Regen?

Sun Oct 23, 2016 3:27 pm

Has anybody found a way to modify the regen? Specifically, I am looking to make it so that it is available at 100% (5 dots) even if you are still @ 99% charge.

Staque
Posts: 119
Joined: Mon Apr 22, 2013 7:11 am
Delivery Date: 24 Apr 2013
Location: Albany, NY

Re: Mod the Regen?

Sun Oct 23, 2016 5:13 pm

Why? To test the battery warranty?

Limey
Posts: 149
Joined: Wed Jun 05, 2013 8:18 am
Delivery Date: 24 May 2013

Re: Mod the Regen?

Sun Oct 23, 2016 8:16 pm

To get better recharge, the current rate just isn't good. if i could have full access to regen immediately, i would gain at least 5% more mileage easily (my morning commute has a good amount of downhill.

RockyNv
Posts: 204
Joined: Mon Sep 19, 2016 10:35 am
Delivery Date: 17 Sep 2016

Re: Mod the Regen?

Sun Oct 23, 2016 8:44 pm

At full regen you are stopping at full brake levels. Once the battery is fully charged to regen capacity the regenerative braking is reduced or completely turned off and only the friction brakes are used. Leaf drivers who live on high mountains have to be careful to not charge their cars fully when at home so that they will not loose regenerative braking on their way down mountain roads making it so they have to rely on friction brakes to keep speed down during their descent.

If you put full regen back into the battery when its at 99% or fully charged they you will likely overheat the battery so that it will fail more quickly. That of course would void the battery warranty since you are defeating the regen cutout that is there to protect the battery. The standard charging cycle is to taper off the charging rate the last few percentage points of the charge cycle since those last few percentage points of charge are the ones that can generate the most heat.

Really look before you leap on hacking the regen program on your Leaf unless the warranty is of no consequence to you.

cwerdna
Gold Member
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Re: Mod the Regen?

Sun Oct 23, 2016 8:54 pm

RockyNv wrote:If you put full regen back into the battery when its at 99% or fully charged they you will likely overheat the battery so that it will fail more quickly. That of course would void the battery warranty since you are defeating the regen cutout that is there to protect the battery.

I suspect there wouldn't might not be an overheat problem but rather the cells will be taken beyond their design voltage, damaging them.

Only workaround for the OP is to not charge as fully.

'13 blue Leaf SV w/premium package (owned)
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LeftieBiker
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Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Mod the Regen?

Sun Oct 23, 2016 10:10 pm

Only workaround for the OP is to not charge as fully.


Geez, where's the fun in that??! Why unplug an hour early when you can hack the car's primary systems, void the battery warranty, and risk who knows what else? Where's your sense of adventure, man?

Actually, when I saw the topic title I thought is was about making adjustments to the regen at typical (lower than 100%) SOC readings. I guess I'm just an optimist...
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

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DuncanCunningham
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Re: Mod the Regen?

Mon Oct 24, 2016 12:27 pm

i used to charge mine to 80%, it's a 2012, and then i've get ti use regen more on my way to work.. but my commute is only 13 miles (one way) so I don't need a fully charge battery to start off the day.
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OakLeaf
Posts: 101
Joined: Tue Dec 11, 2012 1:00 pm
Delivery Date: 21 Nov 2012
Location: Telford, PA

Re: Mod the Regen?

Mon Oct 24, 2016 1:57 pm

LeftieBiker wrote: Geez, where's the fun in that??! Why unplug an hour early when you can hack the car's primary systems, void the battery warranty, and risk who knows what else? Where's your sense of adventure, man?

:lol: All too true, but as you say, where is the sense of fun and adventure in such a simple solution.

Have often thought that it might be useful for those of us that desire maximum regen independent of battery state (charge level/temperature/age) to incorporate a supercap into the system. The supercap would absorb the regen and either feed it back out into the drive system or charge the batteries at a steady rate.

As always, there are a variety of trades to be made in such a design (cost/size/weight/complexity/reliability) and it would probably only address a certain subset of the population. My guess is that it's not worth doing overall, but I really hate to see how little regen is available for the first dozen or so miles on my drive every day.

jjeff
Posts: 1468
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Mod the Regen?

Mon Oct 24, 2016 4:18 pm

Limey wrote:Has anybody found a way to modify the regen? Specifically, I am looking to make it so that it is available at 100% (5 dots) even if you are still @ 99% charge.

I'd like to make regen work on my '12 even at SOCs not much above 70%. It's missing 2 bars and I have a feeling that's the primary culprit but missing 2 bars I really need the regen, but I get very little :( It's out of warranty so I don't really care about that so I would really like a way to bypass whatever is telling my car to only give one or two bubbles of regen even though the battery is much less than 100% SOC......
In contrast my '13S with ECO enabled(no B mode on it but ECO does give significantly more regen) I get more regen at 95% than I ever get on my '12, even at a very low SOC....
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arnis
Posts: 743
Joined: Sat Jan 23, 2016 3:21 pm
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Leaf Number: 015896
Location: Estonia, Europe

Re: Mod the Regen?

Mon Oct 31, 2016 5:19 am

Limey wrote:Has anybody found a way to modify the regen? Specifically, I am looking to make it so that it is available at 100% (5 dots) even if you are still @ 99% charge.


It is not possible to add energy into a fully charged battery without doing harm. End of story. Byebye :lol:

Get a newer Leaf. At normal temperatures 25-30kW regen is available at 95%. Charge to 95%.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

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