Extractor Tin

What size solar panel do I need to decentralize a small fan or not.
I am in the process of passive warming house building my system. My house is crawling. largish area under the tin roof is dark gray. heats up huge I thought about buying a small fan separately and install them to channel hot air from the attic into the room. Through a vent pipe through the port room ceiling. . I want to fan power by solar panels to light automatically make them blow hot air into the attic in the house. . I live in Southern NZ sunshine hours and temperatures comparable to the violence. Northern California.'s Solar panels, you can calculate the size do I need to work correctly? Thanks for your suggestion. . I am completely open the detailed operation of the heater fan, if necessary, I will create my own. All they need do is dig into the air. Every help
I have seen some 24 Volt DC, 18 Watt fans used in ventilation, portable toilet, and they seem to move a fair amount of air You may be good with 40 watts of solar power and double the size of the fan.
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