A shadow free area on the rooftop. (Even a small shadow could affect generation output on the entire string of panels.)
Approx 100-120 sqft is required for installing a 1kWp system.
Ideally, the wiring b/w solar panel on the roof and inverter placed indoor shouldn’t be more than 20m to avoid DC losses.
Inverter and metres should be placed at a conveniently accessible location indoors away from sun/rain.
Batteries need to be placed indoors, separately.