Both are high-output modules, but the design priorities differ
LONGi Hi-MO 9 LR7-72HYD-660M uses LONGi HPBC 2.0 back-contact architecture and is rated at 660W. Canadian Solar TOPBiHiKu6 CS6.2-66TB-620H is a 620W N-type TOPCon bifacial module whose rear side can contribute additional energy when the site geometry supports it.
| Published item | LONGi Hi-MO 9 660M | Canadian Solar TOPBiHiKu6 620H |
|---|---|---|
| Rated front-side power | 660W | 620W |
| Module efficiency | 24.43% from rated power/dimensions | 23.0% |
| Dimensions | 2382 × 1134 × 30 mm | 2382 × 1134 × 40 mm |
| Weight | 33.5kg | 33.4kg |
| Cell/module approach | HPBC 2.0 back-contact | N-type TOPCon bifacial |
| Pmax temperature coefficient | -0.260%/°C | -0.29%/°C |
Bifacial gain is site-dependent
Do not add the Canadian Solar rear-side percentage directly to the 620W nameplate for a roof estimate. Rear gain depends on albedo, module height, row spacing, shading and mounting geometry. Model the actual site.
Engineering fit matters more than the headline wattage
Check roof or racking dimensions, module weight, handling, string voltage/current, inverter MPPT limits, structural loads, certification and local supply. A lower-watt module can be the better project choice if it fits the site and electrical design better.