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I planning to add an anemometer to my small solar weather station. I designed this system to run from a single 3.7v rechargeable battery and a solar panel so I have to calculate in more power drain.
What I don't really understand is do these anemometers consume any external power or just give out a voltage by themselves?
This one doesn't even have consumption specified:
https://www.adafruit.com/products/1733
For this Supply voltage : 5V - 24VDC:
If it runs on electricity it definitely consumes power, its only how much the real question is.
Since you are working with electronics I am going to assume that you have a multimeter, if you dont have one. Its about time you did, doesnt cost much and will save you a ton of time debugging.
Nearly every multimeter has an onboard ammeter (the accuracy will be mentioned in the instructions manual). You can use this to determine the current consumed, have a look at a tutorial from sparkfun on how to do this
