Seems to be useful for you. I wonder how long will the batteries last inside the sensors. I got two AA ones in my weather station too for backup power but it also has a solar array and for 2 years I havent had to change batteres.
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I will install them today and we'll see :)
With the cold that we have now, -10 during most nights, they won't last very long.
Yes, solar panels are a must. We have two panels, 400 W together, on our RV and don't need to extra charge the batteries at all, winter cold included.
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