residential solar system is **defined** by its peak power. e.g. a 1 kW solar system can produce 1 **kW** of power per hour on sunny days. kWh stands for **kilowatt-hour**. **1 unit** of electricity implies 1 kW generated/ utilized in an hour. You need to install at least 3-4 solar panels based on watt peak in an array for the 1 kW solar system.
10kW solar systems are a great investment for homes with high levels of electricity consumption or businesses with relatively small electricity needs.
You can calculate your plant size, area requirement and payback period by our DIY guide.

## Calculate Solar System Capacity

The first thing to do is to find out how many units of electricity you are consuming on an average monthly. If you’re using 1400 kWh per month, let’s consider an average of 6 hours of sunlight per day, this implies you would need 1400 / 6×30 = 7.7 kW at least every hour, i.e. ~ an 8-10 kW system. If you have an idea of the available area on your rooftop, you can also check out our Solar Calculator. Let’s understand this by an example. A “10 kW solar system” means an array of solar panels that produce 10 kW for**every hour of direct sunlight**. So, a 10 kW system, in a location with 4 hours of direct sunlight, makes 40 kWh per day. Assuming 300 sunny days in a year, a 10kw system will generate 14,000 kWh annually which is equivalent to planting 450+ Teak trees and total savings of Rs 45 Lakhs over the lifetime.

## Calculate Area requirement for Your Solar System

Parameters which determine the size of the Plant are as follows:- Monthly Average Bill Peak load in summers & throughout the year
- Sanctioned Load
- Rooftop area or shade-free area

**10 sq meter area for a 1 kW solar system capacity.**Shading is another important factor which decides the positioning and size of the plant. The system should be facing south with a certain degree on the panels. For more details, you may refer to this video. You should look for a maximum area without shade for your solar system to work efficiently.

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I need to learn how to estimate the amount of panels required.