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To supplement Mickey, the formula for converting the bytes on the the CAN network to cell voltage is: volts = (6E1[4] * 256 + 6E1[5] + 420)/200 This is the voltage for cell A in module 1. 6E1 is the PID and [4] means byte 4. If both bytes are zero then the voltage shown is 2.1. However data...

To supplement Joe the RR is only accurate if the car's consumption doesn't change from the moving average. The primary factor determining the consumption is the speed. The consumption in Wh/km or Wh/miles is proportional to the square of the speed times the air resistance so it increases quickly...

Could you connect the CMU of the missing cell to a nearby cell?

Hi Gary Thanks for the feedback. How do the voltages for the LEV50N differ from the voltages for the LEV50?

Hi Martin My 2012 CZero has 139500 km and 32.3 Ah. So good agreement! I have attached 2 rather long papers on capacity measurement and calculations. The programming of the i-Miev is more complicated than one would expect. Cheers David

The latest CZeros only have 80 cells. What would happen if just removed the bad cells and replaced them a thick cable. Could the CMUs be removed too? I know this doesn't help jducro decide whether to keep his iMiev but...

Hi Martin As a rule the remaining capacity is more dependent on the total km driven rather than the age of the battery. What does the odometer show? Cheers David

When charging PID 346 byte3 is 64. That's 01000000. It looks like the second bit is the charging light.

We may be able to filter this out in the 0x373 part of the bridge program: if (incoming.data.byte[1]) < 60 incoming.data.byte[1] = 60; Can1.sendFrame(incoming); Remember to change the code later in the program to avoid sending 0x373 twice. Try it, it is easier than pulling the battery.

Bingo! Time PID int0 int1 int2 int3 int4 int5 int6 int7 07-05-24 16:46:37 373 188 50 119 163 13 147 0 6 PID 373 byte1 is the lowest cell voltage. It's computed by: (50 + 210) / 100.0 = 2.6 volts. Unfortunately there is no information on which cell. I checked the cell data but the...

OBDZero stores two files PID_..txt and PIDint_..txt. In PID_..txt all of the number are in hex apart from the time and date. In PIDint..txt the bytes are converted to integers while the PID is still hex. This save a step when working with the data. In the data piev posted above the PID 346 byte...

Thanks piev. Here is the corrected program.

There are always corrections.

I have a confession. piev sent measurements of a NMC 93 cell that he did on the bench in his workshop two years ago. For some reason I chose to use the data from the scientific article in stead of piev's measurements. Now that we have data from the car I can see that this was a mistake. piev...

I have analyzed piev's data. piev's Arduino bridge changes only 3 values sent by the BMU. They are SoC1, SoC2 and the 100% battery capacity in Ah (PID 374 byte 6). All other values are past though unchanged. OBDZero receives and records these values independently of the bridge. This graph shows...

Thanks for the data piev. I'll try to find out what happened.

Mitsubishi defined 100% = 4.1 volts and 0% = 2.75 volts for the original LEV50 cell. In the article on the NMC cell it looks like the authors defined 0% = 3.05 volts. In the specifications for a NMC 93 cells similar to the ones piev is using, the operating range is 2.75 to 4.2 volts. In...

Hi Frud You are certainly putting a lot of effort into this. The difference between the two graphs has to do with different 100% voltages. In the graph from the article 100% SoC is reached at a voltage above 4.2. In the iMiev the cells are only charged to 4.1 volts. This is exactly what your red...

Correction volts < 3.77367 and not volts < 3.7488