Should I save money with B-grade panels or go A-grade?

I’m planning an off-grid solar setup and would like to get advice from people who’ve already been through this.

While comparing solar panels on Amazon, eBay, and Alibaba, I’ve noticed they’re often labeled as A-grade or B-grade, sometimes at very different price points.

From what I understand, A-grade panels are full-spec, factory top-quality units with better quality control and warranty support.

B-grade panels are cheaper and may have minor cosmetic defects or slightly lower warranty coverage, but still function electrically.

For an off-grid system where reliability matters, is it worth paying extra for A-grade panels, or have B-grade panels worked well in your experience?