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Re: Hx dropping constantly!

Posted: Tue Jun 13, 2017 10:31 pm
by BuckMkII
Well, Jim isn't wrong. After finishing the 100% charge on Sunday afternoon, I went for a short but energetic drive around the neighborhood and bled off 19 GIDs so it wouldn't be sitting 20 hours at 100%. Hx was 82.36 before that drive and 82.62 after. Monday my spousal critter worked at home, so I commuted with plenty of squirt/regenerate/squirt cycles, and am generally trying to drive NON-gently in non-eco/B. SOH went back up to 85% overnight on Sunday, and Hx is now back up to 83.54.

I don't know how we could tell if this is "real" or if it is just gaming the Hx algorithm, but it's more fun than driving like a granny. It also has amazingly little impact on my miles per kWh, which is a big plus for the Leaf. I feel guilty driving my Subaru with any verve since it just wastes gasoline pumping extra air though the engine then heating the brakes. At least the Leaf recaptures a fair amount of the excess kinetic energy.

I'm just worried all that torque is going to shred my almost-done tires. But I needed a good reason to get new ones before the rainy season(s) start anyway. Removing all the remaining tread by challenging the traction control should do it. ;)

Re: Hx dropping constantly!

Posted: Wed Jun 14, 2017 8:33 am
by BuckMkII
...and back up even more this morning. SOH now back to 86% as when I first saw the car. I was driving fairly normally since spousal critter was in car, but still managed to get in some sprightly launches. I'm certainly happy with this. Of course, I don't know how much of this is driving style and how much is doing the deep cycle on the battery last weekend.

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Re: Hx dropping constantly!

Posted: Wed Jun 14, 2017 9:12 am
by powersurge
Sorry to say, I got a headache and whiplash from reading these posts of this new Leaf owner and his state of health stats... Dude, have your spousal critter take away your Leafspy module and have her throw it in the river. You obviously have a love of measuring things to the point that is not healthy for YOUR batteries... Stop with the Leafspy and just drive the car??

The SOH is not going to drop, just like you will not need a nursing home just because you got some grey hairs...

Re: Hx dropping constantly!

Posted: Wed Jun 14, 2017 10:25 am
by BuckMkII
Those hairs aren't gray. I'm reverting to blonde!

Re: Hx dropping constantly!

Posted: Wed Jun 14, 2017 9:40 pm
by jim0266
On my way to golf after work I pushed the Leaf, pulsing and regening in Eco >B mode there and back home. Mostly highway. Only went 42 miles but went from 91% to 32% SOC by the time I returned home. Will keep experimenting. Curious to see if the SOH % climbs. My understanding is LeafSpy only updates this periodically?

Making a 110-mile RT tomorrow where I will charge at my destination before returning home. Good opportunity to keep pushing.

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Re: Hx dropping constantly!

Posted: Sun Jun 18, 2017 9:02 am
by jim0266
Pulse driving has my battery back to 100% SOH, 66.9 AHr and 102% Hx. Keeping a spreadsheet here from data out of LeafSpy as I continue testing:

https://docs.google.com/spreadsheets/d/1GW3yY2nQ18X7M_GhTqpYP5BtN4gR25AMBLCy4rDQil8/edit#gid=2075187567

Re: Hx dropping constantly!

Posted: Fri Jun 23, 2017 5:43 pm
by jim0266
Updating the spreadsheet above, my Hx has fallen to 97.1%, 63.29 AHr and 96% SOH. No amount of pulse driving will maintain my high of 103.57% Hx, 67.3 AHr and 100% SOH. Numbers keep falling.

Re: Hx dropping constantly!

Posted: Wed Jul 12, 2017 1:42 pm
by Dexion11
jim i see you got it back up to 100% again. Did you do anything different from when it was dropping?

Re: Hx dropping constantly!

Posted: Wed Jul 12, 2017 9:19 pm
by jim0266
I had time after work last Friday and decided to see if the car would let me juice the battery. I am able to L2 charge at work and left with 92% SOC. I had dropped to 93% SOH, 61.11 AHr, 94.02% HX. Sure enough the Hx numbers started to climb when I pulse drove. By the time I reached 32% SOC I was able to raise the Hx to 98.49%. A few hours later the car updated the AHr and SOH numbers to 64.25 and 98%.

I L2 charged the car at home the next morning and set out to see if the car would let me keep juicing the battery. There is a nice 10 mile stretch of 2-lane road near my house that is flat and lets me get the car up to 50-60mph then let off the accel pedal. I watch the energy regen screen. In B mode it hits .30. Once it drops below that I accel back to 50-60 mph trying to get at least 5-6 bubbles or max it out. Then let off and repeat the cycle. For each pulse cycle I got back .01 Hx. 100 cycles to get back 1% of Hx in general. I left that morning with 92% and kept pulse driving until I reached 32% where this trick stops working. After the car updated I reached 66.44, 100%, 101.95%. It looks like I could have kept going if I had not reached 32% SOC.

In the name of experimentation I tried again the next morning and the numbers just dropped.

When I reach the mid to low 90's SOH I'll see if it lets me juice again. Seems to work best after a fresh charge. Not sure if Eco > B works better than normal driving > B. In the meantime I'm going to drive more aggressively when possible to see if the rate of drop slows compared to last time.

My weekday commute is only 8 mile RT so I have little chance to push the car and weekends are hit/miss how much I drive. I'll just have to find the time to keep experimenting.

HTH.

Re: Hx dropping constantly!

Posted: Thu Jul 13, 2017 1:05 pm
by Dexion11
so I have a 2015 down a bar (11920 miles)

soh = 85
hx = 76.75
ah = 53.05

I have driven evs for 15 years so I am light footed and careful. I think its a worthy experiment to see if I can get my bar back driving the hx way. But the real question is does higher hx and then the soh and ah going up translate to more range.

IE do we just have a sampling error making us show low/high.