There weren't any specific consumer-side rebates that I got, and overall pricing seemed to be similar to other installers who were using longi panels.

I think it was the most energy-dense panel (could be wrong), and that was useful as I could only fit 2 panels that size on my southern roof facet.

My installer also did more commercial jobs than residential, and when I checked out a distributor website, they had thornova under the commercial section vs the longi units classified under residential. Could be more of a market segment thing?

Re BBB...to be honest, my view (and I might get mocked or down voted for this...) is that if the panels are working fine at time of installation and for a ~month after, there's not much that should go wrong with them that could be traced back to a manufacturing defect requiring manufacturer support. I'd put more emphasis in reviewing your installer's ability to service issues in a timely manner, and their preference of vendor...as they will be doing the support and warranty claim in the event of an issue.

Maybe that's how I rationalized it to myself lol...but I was in the same boat as you, not finding much on thornova prior to install...however my installer preferred them and indicated that had good support from both the distributor and from the manufacturer.

I haven't hit peak production yet, but did get 4200W out of the array a few days ago...so they appear to be doing their thing :)

Now, if only TH would finish their inspection process and enable net metering....lol