Using two fans was the key to my speed control. A single fan rated at 80 watts was just screaming with a 65 watt panel.
Application for 100W panel
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I had thought about using 2 fans but I didn't really have the room and even the 1 fan was already loud enough since it's my house attic so I decided not to use 2 fans. Instead, as I mentioned earlier poss, I am using a DC-DC converter with battery and it has worked well for almost 2 years now. In general, peak attic temperature lags peak sun so I have found my setup gets the attic cooler faster than only direct connection from fan to panel which tends to slow down too much when attic temperature is still very high.Comment
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This is what I used, sourced from ebay12 volt radiator fan.jpg Says push/pull by removing and flipping the fan. They come in a variety of sizes something like 7" to 16"2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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This is what I used, sourced from ebay12 volt radiator fan.jpg Says push/pull by removing and flipping the fan. They come in a variety of sizes something like 7" to 16"Comment
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