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General Question regarding Scaling

Tim Bock
Prodigy 10 points
Other Parts Discussed in Thread: BQ34Z100-G1, BQ34Z100

Hi,

I am trying to specify/design a gauge for vehicles/vessels which could have battery banks as large as 1200Ah and charging currents up to 250A.  The gauge would need to allow for a user selection of the battery chemistry, as I cannot predict what battery bank (Li or PbA) chemistry would be present on the vehicle/vessel.

1) The scaling capabilities of the bq34z100-G1 don't appear to satisfy this range requirement - is that correct?  If not, do you have an alternative recommendation?

2) Can battery chemistry and capacity be designed as user-selectable parameters at setup?

  • 0
    TI__Guru 73830 points
    Tim,
    The gauge is not design to support multiple battery type on-the-fly, much less multiple chemistries. It must be configured and optimized for one particular battery and this procedure must be redone, if a different battery type is installed. The bq34z100.G1 can support up to 32A and 19Ah of capacity. You will need to use current and capacity scaling, if your application exceeds with of these values. For example, for a 1200Ah pack, you will need to use 1200/19 = 63 scaling. I would use use 70 to allow margin. You will need to divide all current and capacity parameters by 70 and scale the current when calibrating the current. If you use a 70A discharge current to calibrate the pack, then you would enter -10000mA in the actual current field when calibrating. All current and capacity parameter values will then be reported at 1/70 their actual values.
    Tom