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BQ24650: Solar PV and protection on the panel side

Part Number: BQ24650
Other Parts Discussed in Thread: BQ2980, , TPS61089

Hello,

This is the set-up I am planning, to charger my 10000mAh Li-ion 1s5p 18650 cell battery pack;

I have opted for BQ24650 as my solar charger for Li-ion battery pack. I have selected BQ2980 for protection of the battery pack. And TPS61089 will give an output of Vout=5V @Iload=2A.

I have few questions regarding the above;

Q1. What is meaning of "Solar Cell Half Panel" as mentioned at point VIN in the Figure 15 of the datasheet of bq24650?

Q2. What all protection I need to provide on the solar panel side to any damage to bq24650?

regards

Swaroop

  • Hello Swaroop,

    Regarding 1, please disregard the "solar cell half panel" comment. At the time of the release, it was 48V for a full solar panel which the part cannot support. Thus it has "half panel" at VIN.
    Regarding 2, please make sure that the voltage from the solar panel does not exceed the absolute max rating on bq24650. We always recommend to characterize the solar panel in the light condition where the end product will operate at first to understand the characteristics of the solar panel (VOC, VMPPT, ISC, IMPPT, etc.)

    Regards,
    Jing
  • Thanks a lot Jing Zou for clarifying both my concerns. I will do the follow up on the second as you have mentioned.

    Thanks a lot !