When you want to invest in solar roof tiles for your house, the cost of solar roof tiles is a very decisive question, and the question “How many solar tiles do l need?” is crucial.

Since the investment cost depends on the number of solar slate roof tiles, how should it be calculated? First of all you need to solve the following four questions.

Your home's daily electricity demand (in kWh)

The size of your roof

Average hours of sunshine in your area

The power of the solar roof tiles

Your household's daily electricity demand (in kWh)

First of all, regarding the daily electricity demand of your home, it is recommended that you can pay attention to your electricity bill in the past six months or refer to the annual electricity consumption of the previous year, in which case you will get a more accurate figure, which will help you to carry out the next step of calculation.

If you are unable to get an accurate electricity consumption, then you can follow this reference table below to determine it.

The above table can clearly get an approximate reference value, a three bedroom house needs 25 pieces of solar slate roof tiles to maintain the daily needs.

If your demand is not in the above table and you need a clearer value, please refer to the following calculation method

A 95w piece of solar roof tiles produces approximately the same amount of electricity in a year:

95*4*0.8*365=110kwh

Assuming your house uses 5000kwh of electricity per year, you will need

5500/110=50pieces

The size of your roof

The size of your roof determines whether you can install the number of solar roof tiles needed to meet your electricity needs, as shown in the table below.

The power generation efficiency of solar roof tiles is directly related to the exposure to sunlight. A south-facing roof is the best because it can enjoy sufficient sunlight. Roofs facing west and east are also fine, but roofs facing north are not recommended at all. The most direct effect of insufficient sunlight is a reduction in the amount of power generated by solar slate roof tiles. Therefore, installing all solar roof tiles on a south-facing roof is the wisest choice.

Average hours of sunshine

Light duration is also one of the most important factors for the power generation of solar roof tiles. For example, in Australia in the southern hemisphere, the average daily light duration can be up to six hours, which is much higher than that in other regions, assuming a 5kw solar roof tiles system.

In the area of 4 hours of average daily light: 5*4*0.8=16kwh

In areas with 6 hours of average daily light: 5*6*0.8=24kwh

So, to calculate the data of solar roof tiles, the length of light is also a very important factor. For the same electricity demand, areas with higher sunlight hours can rely on a smaller number of solar roof tiles to accomplish the task, for photovoltaic tiles roofing system, sunlight is wealth.

Power of solar roof tiles

The power of solar roof tiles, which are the main component of photovoltaic roof power generation, is dependent on the number of solar roof tiles. The output power of our regular solar roof tiles is 95w, the following formula will help you to calculate the installed capacity of your photovoltaic tiles roofing system by the output power of the solar roof tiles.

Output power*quantity=installed capacity

95*50=4750w=4.75kw

After knowing the installed capacity, it can be used to calculate the daily power generation capacity

Installed capacity*average daily light hours*loss rate=average daily power generation

4.75*4*80%=15.2kwh

As a result, installing 50 pieces of solar roof tiles on the roof with an output power of 95W will result in a photovoltaic tiles roofing system with an installed capacity of 4.75kw, and this solar system can generate 15.2kwh of electricity per day in an area with four hours of sunshine.

Of course it is possible to work backwards to calculate the number of tiles needed from the point of view of electricity demand, will you?

Summary

When you want to install solar roof tiles, but can't get started, the first and most important thing is that you need to know the exact number of tiles you need to install, and this number needs to be calculated from your electricity demand, and then adjusted by taking into account the roof surface, the length of light, and other factors.

So how many solar tiles do l need? Of course, you can also contact us to get the exact value to help you plan your investment.

FAQ

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Contact us

Sgbsolar is the world's leading professional solar roof tiles manufacturer, integrating design, production, sales and maintenance. we have been committed to the world's energy saving and emission reduction, creating a low-carbon and environmentally friendly society. contact us for your solar roof tiles solution! Contact us for your solar roof tiles solution!