435 watt Sunpower / Maxeon SPR-435NE-WHT-D Solar Panels
The answer boils down to one simple word To start off with, these are Sunpower / Maxeon panels, which are already the best in the industry. However, unlike my competitors, each pre-owned panel that passes through my hands gets individually soft scrubbed clean with soap and water, then squeegeed dry and hand-cleaned of any residue, before being electrically tested in full sunlight to confirm that it is in good overall condition, and still producing in excess of 95% of its original output capacity.