Large scale solar industrial exhaust fan

1.The fan here is looking like normal industrial wall fan, but it is different in its power source coming from solar panel,and its fan motor is low voltage brushless dc type. so our product won't cousume grid electricity, but enjoy the generous inexhaustible solar energy to freely work in sunny day time. Once sunlight is shining ,fan motor will start running immediately, so you don' need to turn it on, no need to turn it off, because sun energy won't generate electricity bills!