In order to calculate the required power of the solar system, the following items are needed:

1 – Average monthly consumption in KWh – it is calculated by adding up the monthly consumption during the year and dividing by 12 months.

 2 – Number of days in the month -30

3 – Coefficient of utilization of the solar system – usually ranges from 0.8 to 0.9

 4- Number of sunny hours at the given location (6-8 h)

Required salt system power = average monthly consumption: number of days in a month: coefficient: number of sunny hours per day

In order to help you understand this, better we will give you an example.

If the average consumption is 500Kwh, 500:30:0.9:6 = 3.09 Kw

(your monthly consumption is on the bill you pay to the distribution system)

 We divide the obtained result by the power of the individual panel and get the number of panels that we will install.

Lets take as an example that the panel has a power of 330W,

 3.09 Kw=3090 W: 330W=9.36, which means we need 10 panels

We came to the conclusion that for a household that consumes 500 KWh, we need 10 panels with a power of 330W.

In order to accumulate the energy they make for those ten panels, we need a certain number of batteries.

Now you are wondering how many batteries you need for that system???

In order to arrive at the right answer, you have to decide for yourself what percentage of the monthly consumption you actually want to save through the solar system?

If you want to save, for example, 50% of the consumed energy of 500KWh per month, follow the calculation:

500 KWh : 30 days = 16.67 Kwh per day x 0.5 (50%)= 8.34 Kwh

 For 8.34 Kwh you need:

-for example. One accumulator can accumulate 12V x 100Ah = 1200VAh = 1.2KWh

 This results in 8.34KWh / 1.2KWh = 6.95 pcs. it is approximately 7 batteries, but they are used

connect in pairs then we need to take 8 pieces.

Once we have  calculated how many panels we need and how many batteries, the next step would be to look at the inverter.

An inverter is a device that converts the low direct voltage of the panel into the high alternating voltage of the city network (DC/AC converter).

For more details click link.invertor-page