[Nigel]

Werk, I see.  I will still need to go down a remote PV as the sensors are remote from the house.  It might mean that at certain times the Stn will drop out as it loses power.
 

Think on this figures, just for the LoRa transmitter on the 4Pro. It send a data packet almost every 2.6 seconds.




Plus there is around 100mA for the Nano.
Any sleep mode (while not impossible) wasn't seem practicable, as the Nano need to be always ready to read every pulse that comes from the wind sensor (some will give 8 pulses per rotation), or from the rain gauge, besides reading the wind vane, and control the LoRa radio.

I agree that in not so sunny climates, the best solution may be not using a solar panel, but instead a direct 12V power supply coming from a mains adapter.