1. Attachments are working again! Check out this thread for more details and to report any other bugs.

ReInVolt PHEV Plan

Discussion in 'Generation 1 Prius Discussion' started by bwilson4web, Nov 4, 2010.

  1. jk450

    jk450 New Member

    Joined:
    May 11, 2005
    596
    54
    0
    Credit where credit is due: you used Ohm's law. No math trick was used, nor was one needed.
     
  2. bwilson4web

    bwilson4web BMW i3 and Model 3

    Joined:
    Nov 25, 2005
    27,068
    15,372
    0
    Location:
    Huntsville AL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    Wednesday evening, I was monitoring the battery low with the ScanGauge and started seeing some impossible values. I pulled into the grocery store parking lot seeing the traction battery level vary from almost nothing to fully charged.

    When I came back out, the car would not initially start. Battery level looked bad but eventually it started up. Worse, the check engine light came on . . . not good. Regardless, I drove home without any problems other than the 'check engine light.'

    About six hours later, I took the Auto Enginuity laptop out to the car and found . . . the same HV ECU-to-Battery ECU bus problem I'd seen before with the original battery. This was just the second occurrence. I cleared the code and reconfigured to monitor the traction battery for my next errand. This is not a ReInVolt problem but probably HV ECU connectors that need reseating.

    One thing that surprised me was the 4 C temperature difference between sensor #1 and the pair #2 and #3. It was freezing outside and this explains why we tend to see the interior modules failing first. They do not cool as rapidly as the end modules. Ordinarily a 4 C would not matter but over a stretch of years, this would increase the probability of a problem.

    Bob Wilson
     
  3. statultra

    statultra uber-Senior Member

    Joined:
    Dec 6, 2005
    796
    30
    1
    Location:
    Edison,NJ
    Vehicle:
    2001 Prius
    Model:
    N/A
    honestly, to put it simple, my NHW11 battery had a couple bad modules. The car would start but eventually would die down the street. I paid 450 total for two gen 2 packs and rebuilt the NHW11 pack with NHW20 modules, all the scientific info i know is that "it works" and a year later i have no issues to report.
     
    1 person likes this.
  4. bwilson4web

    bwilson4web BMW i3 and Model 3

    Joined:
    Nov 25, 2005
    27,068
    15,372
    0
    Location:
    Huntsville AL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    I repeated the same approach for the ReInVolt pack (*):
    Column 1 Column 2 Column 3 Column 4
    0 dV dI R Pack
    1 318.20 - 316.8 = 1.40 V 3.2 - 1.30 = 1.90 A 1.40 V / 1.90 A = 0.74 ohms NHW11
    2 318.75 - 318.1 = 0.65 V 3.3 - 1.35 = 1.95 A 0.65 V / 1.95 A = 0.33 ohms ReInVolt

    So 19 module pairs per pack:
    • .039 ohms/module pair - NHW11
    • .017 ohms/module pair - ReInVolt
    * - Due to the cold, the ICE started when I shifted into "R". The voltage drop from the 21 A ICE start was 1.8 V and was used as a fixed offset. The battery continued to discharge at expected rates.

    Bob Wilson