Information collected from a 30 MW PV challenge in China’s Tianjin Province confirmed that n-type tunnel oxide passivated contact (TOPCon) modules achieved barely greater than 5% extra vitality yield than of p-type PERC. Evaluation by JinkoSolar, which supplied its TOPCon modules to the challenge, credit the n-type modules’ elevated efficiency to a greater temperature coefficient within the sizzling local weather of the challenge, larger bifaciality and decrease that degradation.
A case examine carried out on a 30 MW PV challenge developed by China Guodian Company (CGC) in contrast the efficiency of p-type PERC and n-type TOPCon modules underneath the identical set up situations. The examine exhibits an elevated vitality yield of simply 5% for n-type modules, over a two-week interval in February 2023.
The 30 MW challenge underneath examine was developed by CGC in Jixian, Tianjin Province. The challenge 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 related with strings of 26 modules with a 225 kW string inverter for each 17 strings.
The efficiency of each module sorts was analyzed in the course of the first two weeks of February 2023. Throughout this era, the n-type modules had been proven to generate a mean of 169.53 kWh per kW put in, a 5.02% a rise of 161.43 kWh/ kW achieved by the most effective performing p-type module on website.
N-type benefit
Module producer JinkoSolar, which equipped n-type modules to this challenge, says this information illustrates the reported benefits of TOPCon over PERC in operation. The producer cites the upper effectivity of n-type modules and higher bifaciality as the principle causes for the rise in efficiency. Higher bifaciality (about 70% for PERC and 80% for TOPCon) could cause a yield enhance of 1- 1.5%.
With solely two weeks of knowledge, collected in the course of the coldest a part of the 12 months in Tianjin Province, different benefits are harder to derive from this case examine. Nonetheless, JinkoSolar additionally cites the bottom failure charge of n-type modules – 1% within the first 12 months adopted by 0.4% yearly which is prone to carry 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 accountable for the extra 2% yield enchancment, indicating that this benefit will be extra seen within the challenge studied in the summertime months when the temperature can attain 30 C and better.
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