David thank you for your comments. If quality control tests each panel and derates the weaker ones, then that makes sense to me. I have the official spec sheet and they are grouped in a chart with 230, 235, 240, and 245 watt panels. They all have the exact same construction. I don’t see a concern there. The difference between 245 and 230 is 6%.
These are polycrystalline panels. I figured that the 60 cell monocrystalline panels would be rated at 300 watts max and that since these are poly panels that they are less efficient. That is industry standard, and again, that is not an issue for me. Maybe these particular panels were shipped and stored for several years before being offered on the market at a discount. They are in their original crates and so again that is not a concern for me. They charge my batteries and they are unused and that’s good enough for me. If Trina Solar honors the warranty in 16 years for two or three underperforming panels that would be great. I am happy either way.