Sorry for taking so much of your time and for your patience. I'm a biologist and this is kind of a completely unknown (but very interesting) world for me.
The pump will be operated an average of 300 to 400 seconds per day in the following way: when we get to a nest, we lift up the device and spray 50 times (max). Each spray lasts about 1 second. We then take the device down, walk for an hour or so to the following nest and repeat the procedure. We can not treat more than 6 nests per day.
The good news is that we can recharge batteries every day near field site.
This is what I have of the pump:
Voltage: 3 to 5 V.
Working current: 130mA - 220mA
Power: 0,4W - 1,5W
Is there any other spec that can be of help?
Solar panels are a good option, at least to recharge batteries in between treatments.
Following your advice, I prefer to figure out how to power the 433/866MHz module (power consumption in standby mode: 7mA, activated: 39mA). I'm thinking in 3 18650 batteries (3000mA each), 1 protection module and a step-up power source ( Xl6009).
Hope it works!
Martín