Solar Panel System GuideJA Solar and Canadian Solar both list N-type TOPCon lines. This page sets their documented numbers side by side and picks no favorite.
How to read this comparison
Every figure below is quoted from the manufacturer datasheet for a specific model. Efficiency and wattage are stated at standard test conditions, the same lab benchmark for both, so the numbers compare like for like. Warranty terms are worth reading closely because manufacturers split product and performance coverage differently. Numbers change as manufacturers release new model years, so always confirm against the current datasheet for the exact model a quote lists.
JA Solar DeepBlue 4.0 (from the JA Solar product page)
JA Solar lists the DeepBlue 4.0 on N-type TOPCon cell technology with a power range of 420 to 740 watts across formats and module efficiency up to 22 percent.
On warranty, JA Solar lists a 30 year power warranty at an annual degradation rate of 0.3 percent.
Canadian Solar TOPHiKu6 CS6.1-72TD (from the Canadian Solar datasheet)
Canadian Solar lists the TOPHiKu6 CS6.1-72TD with N-type TOPCon cells, a power range of 595 to 620 watts, and module efficiency of 22.0 to 23.0 percent.
On warranty, Canadian Solar lists a 12 year enhanced product warranty and a 30 year linear power performance warranty, with first year degradation no more than 1 percent and no more than 0.4 percent per year thereafter.
Where they differ on paper
Both brands list N-type TOPCon cells and a 30 year power warranty. On peak efficiency, Canadian Solar lists the TOPHiKu6 at up to 23.0 percent against JA Solar's up to 22 percent for the DeepBlue 4.0.
On degradation, JA Solar lists 0.3 percent per year while Canadian Solar lists first year degradation no more than 1 percent then no more than 0.4 percent per year. These are the documented figures, not a verdict.