This law mandates that solar panels must be installed at least two meters away from property boundaries. Additionally, local regulations may vary by region or province, so it is essential to check local laws before installation. You'll need to consider inverter capacity, grid regulations, and even your utility company's appetite for. . Panel Size and Configuration: Solar panels come in various sizes and configurations, commonly with 60 or 72 cells. Example: 5kW solar system is comprised of 50 100-watt solar panels. A general guideline serves that a gap of. . Online solar calculators can give a rough estimate of how much solar you need to power your home, but you may want to perform your own sizing calculations to fine-tune your choices.