Knowledge collected from a 30 MW PV undertaking in China’s Tianjin Province confirmed that n-type tunnel oxide passivated contact (TOPCon) modules achieved barely greater than 5% extra power yield than of p-type PERC. Evaluation by JinkoSolar, which supplied its TOPCon modules to the undertaking, credit the n-type modules’ elevated efficiency to a greater temperature coefficient within the scorching local weather of the undertaking, larger bifaciality and decrease that degradation.
A case research performed on a 30 MW PV undertaking developed by China Guodian Company (CGC) in contrast the efficiency of p-type PERC and n-type TOPCon modules beneath the identical set up circumstances. The research exhibits an elevated power yield of solely 5% for n-type modules, in a two-week interval in February 2023.
The 30 MW undertaking beneath research was developed by CGC in Jixian, Tianjin Province. The undertaking has 20 MW made up of two totally different 545 W, p-type PERC modules from unnamed producers, with the remaining capability made up of 555 W n-type TOPCon modules equipped by JinkoSolar. All modules are put in on fastened tilt racking at a 30 diploma angle, and are linked with strings of 26 modules with a 225 kW string inverter for each 17 strings.
The efficiency of each module varieties was analyzed throughout the first two weeks of February 2023. Throughout this era, n-type modules have been proven to generate a mean of 169.53 kWh per kW put in, a 5.02 % enhance of 161.43 kWh/ kW achieved by the perfect performing p-type module on website.
N-type benefit
Module producer JinkoSolar, which equipped n-type modules to this undertaking, says this information illustrates the reported benefits of TOPCon over PERC operation. The producer cites the upper effectivity of n-type modules and higher bifaciality as key elements within the efficiency enhance. Higher bifaciality (about 70% for PERC and 80% for TOPCon) could cause a yield enhance of 1- 1.5%.
With solely two weeks of information, collected throughout the coldest a part of the 12 months in Tianjin Province, different benefits are harder to derive from this case research. Nonetheless, JinkoSolar additionally cites the bottom failure fee of n-type modules – 1% within the first 12 months adopted by 0.4% yearly which is prone to deliver a yield enhance of round 1.8% over the typical PERC deterioration of two% a 12 months adopted by 0.45% yearly.
Lastly, it cited the low temperature coefficient of n-type modules – 0.29% efficiency loss per C of temperature rise, in comparison with 0.35% for PERC modules – as chargeable for the extra 2% growing the yield, as this benefit could be extra seen within the undertaking studied in the summertime months when the temperature can attain 30 C and better.
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