Power options as follow:
1 sensing when the gate opens (mains available)
2 irrigation controller (mains available)
3 water level sensor (solar/battery power)
4 weather station (solar/battery power)
5 hothouse controller (mains available)
6 greenhouse controller (mains available)
7 - 11 soil and environment sensors (solar/battery)
I would say the most central point is the greenhouse (mains available). I have a Wifi AP there that connects with the main Wifi AP and ADSL station. Thus the greenhouse is probably the ideal location for a gateway and controller. This should bring most distances closer, bringing the maximum distances perhaps down to 500-700m.
The whole farm is pretty much covered with Wifi but I would have liked to keep the nodes -> gateway off our wifi, and only use the wifi for the controller...
Do you consider the amplified (and slightly optimised) NRF24L01s sufficient for the node network? Or RFM69HW?