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bq 34z100-G1 in Battery pack > 290Ah

gio ang
Prodigy 30 points
Other Parts Discussed in Thread: GPCCHEM, BQ34Z100-G1

Hi all,

i have the need to use this product in lead acid 48V battery pack untill 500-600Ah; maximum current system is around 130A. I know that i can scale current reading as i want, and this is not a problem, but if the maximum internal scale factor is 10, so the maximum Capacity system should be 290Ah. How can i solve this problem?

  • 0
    TI__Guru 73830 points
    You can scale the device by more than 10x. Just apply the same scale factor to current and capacity parameters and the current when you calibrate.
  • 0 in reply to ThomasCosby
    Prodigy 30 points
    We would like to use this Ic in our residential storage system that we produce. We sell it without battery pack. The customer buy and connect itself battery pack. It is 48V lead acid pack but capacity can be 150 to 600 Ah.. Maximum current never exceed 150A. Battery pack can be Vrla, or Agm or Flooded acid and from different Manufacturers. Our system is managed by a microprocessor (that manage bulk and float charge temperature based) and had various parameters that customer can set by the machine display. Bq 34 can learn itself battery pack type in this differents scenarios? If yes, first time are required particularly charge/discharge cycles or calibrations? It is possible to do this after the storage machine is installed in customer house? What kind of default chemistry should we use? What essential parameters related to bq 34 we have to make configurable by the customer to fit itself his battery pack? (This parameters had to be configurables through i2c commands by our processor and not by external i2c programmers?).
    Thank you
  • 0 in reply to gio ang
    TI__Guru 73830 points
    The bq34z100-G1 can support host-side gauging, where the battery can be swapped. The device can "learn" the Ra table and Qmax for the new battery as the pack is charged and discharged. But, the device is designed to support one particular battery at a time. Each new battery model, and capacity, that you want to support will be a new design. You can use our online GPCCHEM tool to try to find a ChemID match to your cell. Search for GPCCHEM on the TI website.
  • 0 in reply to ThomasCosby
    Prodigy 30 points
    Thank you for your reply. Before to start to spent weeks of study over bq34, i would like to understand if it can suit our residential storage system. We sell it without battery bank (48V) . We have the possibility to change by our microprocessor the charge voltage that can be 2,35V/el or 2,4 etc. We now make the bulk charge by only consider time and voltage (with temperature correction) and desired discharge point by a simple V/I curve (configurable by parameters). We would like to improve our machine by a real SOC detection, but the problem is that we can't know exactly witch kind of battery (manufacturer and capacity) that customer use for new pack and especially for the pack used after some year to replace te old pack. On the other hand we can't tell to our customer to buy an ev2300, connect it to a Pc and to our machine and play a learning cycle using a c/10 current when our machine is connected to his house.
    There is a way to add a series of configurables parameters to our machine (i guess charge voltage, battery capacity, discharge voltage etc.) so that customer can easily change only this parameters to fit to his battery pack without the need to make a complex and impossible calibration when machine and battery pack are in use in his house?