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Using a radiator cooling fan with a solar panel will give you the best efficiency because it is a DC system, no need to go through an inverter, you can connect it directly. See the details in this clip. The list of products I used in the clip is in the link below. The fan I bought for 340 baht is now only 280 baht in this shop, follow this link https://s.lazada.co.th/s.MbiuU The motor controller costs 80 baht. https://s.lazada.co.th/s.MbRfs 100-watt solar panel costs 1,600 baht. https://s.lazada.co.th/s.MbR7Q