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Photovoltaic module load voltage (recommend data): 12V System best mppt working voltage range (18V-60V); 24V System best mppt working voltage range (36V-72V); 36V System best mppt working voltage range (54V-144V);48V System best mppt working voltage range (72V-144V). NOTE: 1.There will be some data records on the product display, which is due to our installation and quality testing left behind, this is a normal phenomenon! 2.The product is packed in a sealed color box! The product picture is introduced.If you have any problem,please contact us to solve them by the website on the product,thank you.