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What will happen?

  • Balance after 10 days

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  • Balance after 30 days

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  • Balance after 60 days

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  • Balance after 90 days

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  • Balance after ?? days(post)

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    2
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Discussion Starter #21
Bad sticks/packs definitely will.

Again, kinda a tricky question. If the pack is severely out of balance from sitting, discharging before a charge would likely have better results.
 

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Ok - thanks Eli. I guess I’ll plan to do the three complete charge/discharge cycles before driving. Pack is the original and should be replaced. 👍
 

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OK thanks... I thought I’ve read other threads that have indicated a complete discharge occurs after sitting for several months... I better not assume that! I’ll plan to do a full grid charge before driving next spring. (Do you recommend discharging prior to charging?) Thanks
I bought my insight from a couple that had parked it after throwing an ima code which had sat for over three years not being driven. Still had juice. I charged it up, not knowing about the method, and drove it for a year, 100 miles a day, with level being at the top or 1-2 bars below but always full once I’d parked for the evening. Then I left it over the summer and didn’t go anywhere and this is when ima went to having to charge once a week.


Sent from my iPhone using Tapatalk
 

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A couple thoughts and a comment about the max voltage from Elis' 4th post
My route into work is just typical city traffic, I usually park at the shop around 75% BCM SoC and 170V. I've found a route that has some decent hills for the commute home; I'm able to get the BCM SoC down below 65.0% before getting in some good regen. If you don't get it down to 65.0% or below, it won't hang at 72.0% on the way back up. So I have been doing one of these 72.0% hang cycles per day. Typically, I've been getting home with the BCM SoC at 80% and the battery at ~180V. It's been so cold here that I only ever see 35-40A of regen, peaking out around 190V. Lowest I've had the BCM SoC is 51%, but usually just below 65% before starting aggressive regen back up to 80%.
I realize the sticks Eli is using are new / healthy.
I wish I had more pack data from when my 06 HCH2 was new / healthy.
I say that because during my pack cycling I've noticed with my old packs,, that the flattest part of the discharge slope, as seen on the LabView graphs, is between 175 to 165 volts. In other words it takes almost 1 hour to discharge from 175 volts to 165 volts and almost 2 more hours to discharge the other 55, 75 and 105 volts receptively of the 3 cycle deep discharge routine.
Edit: the 3 cycle deep discharge routine with the ( reduce minimum discharge voltage ) option selected.
My three HCH2 154 volt nominal packs generally reach around 190 volts after initially charging at 1 Amp to the chargers cut back voltage setting, than soak charging 15 hours at 350 mA ( or when the charger detect a sustained voltage plateau ) before the GC01 switches to discharge automatically.

The self discharge rate (even without the dischargers load connected) of the pack at 190 volts is rather fast down to about 185 volts when the packs self discharge rate starts to slow.

I was quite surprised to read that Elis' new bumblebee? pack peaked at 190 volts in his HCH1.
That is the reason I wish I had more data about my HCH2 pack when it was new, given flat part of the discharge slope between 175 and 165 volts.
I've seen my HCH2 pack charge in the car up to 185 volts and I know how steep the discharge slope is at that voltage even with only the modest discharge load of the GC01s' 600 watt 120 volt dual bulb wired in series halogen work light discharger.

My thought was to try to get the pack and the IMA to work together and not charge the pack in the car to such a ( high voltage, 185 volts).
Ideally, charging only to 180 or even 175 volts to take better advantage of the best part of the packs strength
as seen during grid charging.
Edit as seen during the discharge cycles

But without knowing more about how the IMA was programmed when new or what the voltage range the IMA used when new, I have no ideas to make judgement about how the updated IMA and older weaker pack should function ideally.

Lastly, my initial thought when reading the description of the artificial imbalance was.
What was the rebound voltage of the sticks that were only charged minimally in sequence?
And was there self discharge from the initial voltage readings of the fully charged sticks?.

I realize voltage is only one aspect of battery health, on the other hand it does offer a few additional clues about how a cell stick and pack will behave.
 

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Discussion Starter #25 (Edited)
Well, so the peak of 190V was under 40A or so of regen. The HCH2 has 22 sticks, so the equivalent there would be 209V.

Can't sleep. Counting batteries not helping....lol. Will post more tomorrow.
 

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Discussion Starter #26 (Edited)
Oh how time flies.. I know you're all just dying for data. :geek:

I haven't had time to organize/post it how I want to, so I'm just going to post it in a big lump.

StickInitial ChargeCharge Based SoC10 Day Disch(130mi)SoCSoC GainmAh Difference(Last Chg)10 Day Chg30 Day Disch(130+367=497mi)SoCSoC GainmAh Difference(Last Chg)
11031.58%168525.92%24.34%15821704558385.89%59.97%3879
2100415.45%247638.09%22.65%14722503551384.82%46.72%3010
3200330.82%336551.77%20.95%13623402561786.42%34.65%2215
4300346.20%424965.37%19.17%12464203562186.48%21.11%1418
5400261.57%493475.91%14.34%9324903565587.00%11.09%752
6500376.97%539282.95%5.98%3895406568887.51%4.55%282
7645799.34%559486.06%-13.28%-8635704573788.26%2.20%33
86507100.11%562686.55%-13.55%-8815704574388.35%1.80%39
96508100.12%558385.89%-14.23%-9255703567887.35%1.46%-25
106508100.12%556785.65%-14.48%-9415704570987.83%2.18%5
116509100.14%559086.00%-14.14%-9195703572088.00%2.00%17
126519100.29%551884.89%-15.40%-10015703573888.28%3.38%35
136527100.42%560186.17%-14.25%-9265704573188.17%2.00%27
146541100.63%561786.42%-14.22%-9245703572688.09%1.68%23
156546100.71%565987.06%-13.65%-8875703577788.88%1.82%74
166547100.72%561886.43%-14.29%-9295702576888.74%2.31%66
176552100.80%559286.03%-14.77%-9605703570987.83%1.80%6
186589101.37%561286.34%-15.03%-9775704575588.54%2.20%51
196591101.40%561586.38%-15.02%-9765703574988.45%2.06%46
206683102.82%564586.85%-15.97%-10385704577688.86%2.02%72


So as you can see, after 30 days and just under 500 total miles, the sticks are within 4% SoC of each other. That's after starting out with basically a 100% difference.

Why do we think this has this happened? Would this be possible with any battery?
 

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Discussion Starter #28
Yeah. This pack would be a BeeMax "Performance" with a 5 year warranty.
 
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