Choosing a module technology for a home roof gets easier once degradation, heat behaviour and warranty wording sit side by side, so this page compares an topcon solar panel route against a conventional solar panel route, then works through the published figures for the Talesun TM7G54M-445 all-black module.
Both are silicon modules and both can power a home, but they take different routes through the cell structure, and that changes how a roof ages.
The comparison names one N-type TOPCon residential module example with published figures.
| Parameter | Published figure |
|---|---|
| Module | Talesun TM7G54M-445, an N-type TOPCon residential module example |
| First-year degradation | No more than 1% |
| Annual degradation after year one | No more than 0.4% |
| Product warranty | 25-year, Talesun-backed |
| Linear power warranty | 30-year, Talesun-backed |
| Pmax temperature coefficient | -0.29%/°C (each degree above 25°C reduces peak power by about 0.29%) |
Warranty figures are the manufacturer terms for that model. Read the warranty document for the exact terms that apply to a specific installation. The comparison does not state wattage, efficiency, voltage, current, or dimensions for any module.
The better choice depends on roof area, climate, and how long the owner expects to keep the system.
When every square foot has to earn its keep, the lower degradation profile and stronger weak-light response of an n-type TOPCon module tend to look more attractive.
TOPCon designs often carry a slightly better temperature coefficient, so they lose a little less output for each degree above 25°C.
If the owner wants the flattest possible annual curve over decades, the passivated contact route is the one usually discussed.
Where space is not limited and the owner may sell before thirty years, a p-type PERC module remains a sensible, often lower-cost route.
Review the full n-type TOPCon versus p-type PERC comparison, then talk to the team about the modules that fit your layout, climate, and budget.
Keep adjacent product options together for a faster catalog comparison.
Roof space runs out before the budget does. The Sunpro Power 440W module is built for fixed layouts where every square foot has to earn its keep.
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Maximize energy with this 445W all-black bifacial module: n-type TOPCon cells and dual-glass construction are rated for up to 25% extra yield.
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A 590 W n-type bifacial solar panel from the Talesun BIPRO range, built for arrays where roof area is fixed. Shipping and SoCal warehouse pickup.
View productAn N-type TOPCon cell starts with an N-type silicon base, usually doped with phosphorus, and adds an ultrathin tunnel oxide plus a doped polysilicon layer on the rear to form a passivated contact. A P-type PERC cell starts with a P-type base, traditionally doped with boron, and uses a rear passivation layer with local contact openings. Both are silicon modules and both can power a home.
PERC modules can form boron-oxygen defects under light and heat, which is one reason they often show a first-year drop. TOPCon is less sensitive to those defects, so it usually starts with a smaller initial decline and then follows a flatter annual curve. Independent reliability programs such as the pvel module reliability scorecard test modules through thermal cycling, damp heat, and other stress conditions.
The Talesun tm7g54m-445 is listed with a first-year degradation limit of no more than 1% and annual degradation after year one of no more than 0.4%, together with a 25-year product warranty and a 30-year linear power warranty. These are manufacturer terms for that model, so read the warranty document for the exact terms that apply to a specific installation.
Both technologies lose some power as cells get hot. The Talesun tm7g54m-445 lists a Pmax temperature coefficient of -0.29%/°C, meaning each degree above 25°C reduces peak power by about 0.29%. TOPCon designs often carry a slightly better temperature coefficient than PERC, which helps where summer heat is strong.
PERC remains a mature route with a long field history, broad availability, and often a lower upfront price. Where the roof has plenty of open area, the climate is mild, and the owner may sell before thirty years, the small daily output gap versus TOPCon may matter less.
Confirm the numbers published for the exact model and variant, including degradation limits, product and linear power warranty terms, and the temperature coefficient. The comparison does not state wattage, efficiency, voltage, current, or dimensions, so ask the supplier for the datasheet that applies to your installation.
