You'll need:
- Solar Panel(s)
- Charge controller / MPPT
- Power supply to provide more stable power (could be integrated in MPPT/Charger)
- Batteries
- 2 long range wifi devices (one for the house, one for the remote location), some may require PoE for power.
- Camera you want to use, you may want to consider some other models.
- They have a few cameras targeted at transportation markets that are more tolerant of voltage variation
- Cables, wiring, some kind of NEMA enclosure.
- Hardware to mount the solar panels
To figure out some of this, a bit of math is required.
You need to know a few few things:
what the solar irradiance is for your location so you can estimate the amount of power you'll be able to generate and how many cloudy days you want to plan on. (some websites give kWh/m^2 based on location which works too)
The power consumption of your camera and networking hardware, power supplies (efficiency), etc.
Once you figure some of this out you can calculate how many watts or meters of solar panel are required and the capacity of battery required.
You're roughly in the $300-700 range for everything you'd need to do solar excluding the camera ($100-200) and wifi ($100+), but your location is a factor here.
You should also consider the option of a high end PTZ like the SD6AL245U-HNI-IR with lots of zoom or a fixed ultra zoom like the SDZW2030S-N (which probably doesn't have enough zoom)
The cost of a high end PTZ may be competitive if you have visual line of sight on the area.