LiFePO4 battery charging from solar panel?

Hello Jan,

What is the series cell count for this application? We should have a gauge that works with your system, but depending on the cell count we can provide the best option.

Sincerely,

Wyatt Keller

Thanks Rushi,

It's 1S application, but the datashet says that BQ27z561-R1 supports Li-ion batteries, not LiFePO4

Jan

Hi Wyatt,

I'm looking for a solution to charge a small single LiFePO4 battery from a solar panel.

Anything available?

Jan

Hi Jan,

This gauge is targeted for li-ion/lipo packs. However, we do have support through FW for LFP batteries as well as referenced in our technical reference manual: https://www.ti.com/lit/ug/sluuc54b/sluuc54b.pdf

Please refer to section 4.9 [LFP_RELAX] register.

Thanks,

Rushi

Hi Rushi,

Thanks, I will have a look at it.

How about the charger IC? Any solution here?

Is there a combination of a solar energy harvester plus non solar LiFePO4 charger?

Cheers,

Jan

Hi Jan, 

The charger IC is handled by a different team. I will have one of their experts make a recommendation for you.

Thanks,

Rushi

Thanks Rushi, appreciate it.

Hi Jan,

Is the solar panel 6V OCV or close to the MPPT operating voltage? How much charging current is in your design?

Hi ezhao,

My solar panel is 6V (like one of them.

The charging current is from 100mA - 1A

Jan

)

Thanks, but both BQ25896 and BQ25895 support Li-Ion/Li-Polymer chemistry and I need LIFePO4

Hi Jan,

Please check out the BQ24650. It is a charger controller and requires MOSFET. The schematic check list is here: https://e2e.ti.com/support/power-management/f/196/t/791790

I forgot that the minimum battery voltage is 3.84V for BQ2589x.