However, when some of them are cheap to purchase, it is expensive to use; worsely, when some of them are not cheap to purchase, it is even energy costly to us, isn't it?
Is there any other fan to help us save troubles and bring down the costs?
* if the fan runs 8 hours per day, and local electricity cost is $0.15 per KWH,
electricity wire connections are done here
it smartly shift the power suppliers between solar panel & AC/DC power adapter to the fan
DC output: 36V*8.9A
it provides backup power to the fan only when
solar panel's input is inefficient
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