LFP batteries have additional limitations that lead-acid don't - cell and BMS current limits, e.g., the 100Ah battery likely has a cell and BMS limit of 100A discharge.

The 200Ah likely has a cell discharge limit of 200A, but the BMS is still probably limited to 100A.

Hello,
You commented on a question I had about switching to Lithium battery. I see they have grp27 size 100ah and the next size size is 200ah. Instead of buying two smaller ones does one bigger one make sense? I plan to expand the solar and add a converter to run the a/c. Thank you