- Your location determines the amount of solar insolation (sunlight falling on the panel per day). India generally receives 4-7 KWh of solar insolation per square metre. The approximate solar insolation at your location is determined by measuring the latitude and longitude of your location.
- Before installing rooftop solar panels for home, HomeScape measures the amount of solar insolation using on-site sensors during the site survey.
Orientation of the roof:
- In the northern hemisphere, a south-facing roof is ideal as the sun is always to the south in the temperate and tropical zones.
- If a south-facing roof is not available an east-west facing roof could also be considered (as it will cover the sun’s movement across the sky from east to west during the day). The output of the rooftop solar panels reduces in proportion to a horizontal angle greater than 15% from due south. We calculate the output and the impact on power generation while installing panels.
- Rooftop solar installations are not restricted to flat roofs – they can be mounted on sloped roofs as well, with a correction in the angle of mounting for the slope of the roof.
- The efficiency of the panel is calculated as the ratio of the capacity of the panel (kWp) to the size (area) of the panel (sq. metre), expressed as a percentage.
- Solar panel temperature is an often ignored but critical parameter in a tropical country like India. Though it might seem counter-intuitive, rooftop solar panels generate less power in hot summers as the heat reduces their efficiency. If you live in an area with exceedingly hot temperatures during the summer months you may find that your rooftop solar panel installation efficiency increasing in the winter.