I have been trying to do some math to figure how big the battery and solar panel need to be in order to power the TX unit.
WerkAG says the average consumption should be around 100mA at 12V. That is 0,1Ah*24=2,4Ah per day.
I assume that value is missing powering the Fan (configurable option). This should happen more often in summer and during daytime, when there is more Sun available. Still, assuming a 4 hour per day working average, with a 150mA fan that would add 0,6Ah per day.
That leaves us with a total (TX Unit with Fan) of 3Ah per day, which is not bad.
3 Ah x 3 days of autonomy x 2 (use only 50% of the battery) x 1,1 (assume there will be some loss draining the battery) means a 20Ah battery will be in order...
Still, when I try to roughly add-up the consumption of components individually I end up with half that value (assuming readings are taken and transmitted every 60 seconds and the remaining time the sensors are off).
I also seem to understand that this could be improved even further by sending the Arduino a "sleep x seconds and wake up to take new readings" command.
EDIT: Now that I think of it, perhaps it can not go to sleep as it must count the wind cup rotations..?
So, can you gentlemen please tell me what's wrong with my math? What am I underestimating/missing? (See attached table pic)
WerkAG says the average consumption should be around 100mA at 12V. That is 0,1Ah*24=2,4Ah per day.
I assume that value is missing powering the Fan (configurable option). This should happen more often in summer and during daytime, when there is more Sun available. Still, assuming a 4 hour per day working average, with a 150mA fan that would add 0,6Ah per day.
That leaves us with a total (TX Unit with Fan) of 3Ah per day, which is not bad.
3 Ah x 3 days of autonomy x 2 (use only 50% of the battery) x 1,1 (assume there will be some loss draining the battery) means a 20Ah battery will be in order...
Still, when I try to roughly add-up the consumption of components individually I end up with half that value (assuming readings are taken and transmitted every 60 seconds and the remaining time the sensors are off).
I also seem to understand that this could be improved even further by sending the Arduino a "sleep x seconds and wake up to take new readings" command.
EDIT: Now that I think of it, perhaps it can not go to sleep as it must count the wind cup rotations..?
So, can you gentlemen please tell me what's wrong with my math? What am I underestimating/missing? (See attached table pic)