How much it cost to install solar celss at home?

Before you know how much budget you need to install solar cells, And which system is worth installing? Let's get to know the solar cell system first. How does each system work? for choosing and installing correctly and appropriately By solar cells (Solar Cell) or electronic devices that change solar energy into electrical energy. There will be 3 systems: on-grid system (On-Grid), off-grid system (Off-Grid) and hybrid system (Hybrid). We will choose according to the purpose. and behavior in using electricity.

Solar cell working system

1. On-Grid system

It is a solar cell system connected to the transmission system from the electricity authority. It means that this system will only help save some electricity costs. which is On-Grid type There will be solar panels connected to an inverter to convert electricity into alternating current. To be able to connect to the power supply system with various electrical equipment. There are also interesting features and points that you should know as follows.

Easy to install and maintain
Suitable for factories and household buildings.
No batteries required, reducing costs.
Use only during the daytime or only sunlight
Electricity can be produced and used immediately.
Can sell electricity back to the electricity authority. (For 1-phase electrical systems, it can be sold with solar cell systems that do not exceed 5 kilowatts. For 3-phase electrical systems, it can be sold with solar cell systems that do not exceed 10 kilowatts.)
Must request permission from the electrical authority before installation.

2. Off-Grid system

It is a system that does not rely on the central electrical system. (Metropolitan Electricity Authority or Provincial Electricity Authority) to use energy. Simply put, it is a Stand Alone installation. The solar cell can be connected directly to electrical appliances that support direct current. However, the Off-Grid system has points that should Know as follows

There is an installation cost. and high maintenance costs Because there are many accessories
Suitable for areas far from electricity such as mountains, islands, or for use in large industries.
No need to pay electricity bills to the electricity authority each month.
There is always power available even in emergencies such as power outages or power outages because there is a backup battery.
Can be used when there is no sunshine. Because it is a system that can produce its own energy.

3. Hybrid system

Also known as a mixed system, it combines the advantages of On-Grid and Off-Grid systems. If using this system In addition to saving on monthly electricity bills, We can also reserve electricity for use in times of emergency. As for the electrical system, it is very stable. Because there is power supply both from solar cells, electricity and from batteries. The hybrid system has its strengths and points that you should know as follows:

The hybrid system will not be able to sell electricity back to the electricity authority.
Can be used as an emergency light in times of power failure. Because there is a battery
Reduce electricity bills as much as possible But installation is very expensive. This makes it take a long time to get your investment back.

Read up to here. You probably already know what types of solar cell systems there are. But it is not possible to buy and install just because you see that it is clean energy. and can help reduce electricity bills Because the installation should take into account that What is our house like? Is it appropriate to install it? Including consideration in terms of budget. So that the solar that you are willing to spend money on is effective in use. and is most worth the investment. But "What kind of house is worth installing solar cells for?" Let's find the answer together!

What kind of house installing with solar cells is worth ?

A house that uses a lot of electricity during the day And the air conditioning is turned on regularly, such as houses where people stay during the day, restaurants, home offices, shops where the air conditioning is always on, etc.
Homes with expensive electricity bills exceeding 3,000 baht/month may consider installing solar cells. To save on electricity bills in the long run In addition, it is an electricity consumption rate that is enough to be worth the minimum power output of the solar cell, for example, starting at 1.8-3 kilowatts (depending on the package of each company) with a 1.8 kilowatt solar cell. The maximum savings on electricity costs will be approximately 900-1,000 baht/month. The installation company will evaluate the worthiness of each home on a case-by-case basis.
Homes or organizations that want to use clean energy But it is important that there must be appropriate and sufficient space for installing solar panels. For example, there should be a rooftop or area on the roof that faces south because it receives light well. The installation will take approximately 7.7 square meters or more. And the installation area must be able to support a weight of approximately 27 kilograms per square meter or more.

How much does it cost to install? And payback in how many years?

If your building is suitable for installing solar cells It would be a good idea to try installing one to save on electricity costs in the long run. However, calculating how many size solar cells we need is How much is the budget? And how many years will it take to pay back the investment? It also depends on the electricity usage and installation area of each home. Experts will always evaluate the work site before installation. We will give some brief examples to help you make your decision.

There are often no strict requirements for installing a solar system. The main factor in the calculation is the cost of electricity. or the amount of electricity used each month Most of the time, we tend to choose an installation size of 60-80% from the amount of electricity used.
- To calculate the cost of electricity,we will calculate it from the electrical unit of kilowatts (kW). Suppose that 1 solar cell panel is 120 x 60 centimeters in size, has an area equal to 0.72 square meters, and has a production capacity of 102 watts per panel. This means that if we were to produce 1 kilowatt requires 10 panels to install. Occupies an area of 7.2 square meters on the roof.
- Then look at the amount of electricity used each month and see how many units (KW-h) are used. For example, if you use 2,000 units per month (pay for electricity approximately 10,000 baht per month), write down the meter number 2 times in one day. The first time is in the morning. Around 9:00 a.m. and 5:00 p.m. in the evening, for a total of 4 days, then subtract. You will get the number of units used during the daytime.
- Then divide all the units obtained by 4. For example, 55+40+50+45 = 190/4. On average, electricity used during the day is approximately 47.5 units.
- In a day there are about 5 hours of sunlight, we need to divide 47.5 units by 5 to equal 9.5 kilowatts. Therefore, installing about 10 kilowatts of solar cells would be the most appropriate and cost-effective. The number of panels to be installed must be determined according to the amount of watts per panel.
- For example, a large family home with more than 4 people or an electricity bill of more than 3,000-7,000 baht/month is recommended to install 5 kilowatts, which will reduce the electricity bill by approximately 2,000-3,000 baht/month. The installation price will be 2-3. Hundreds of thousands of baht, depending on each package. There are also additional costs, such as space renovation costs. Permission fees, etc.

As for payback, it depends on many factors. Whether it is the electricity usage of each home The production capacity of the solar cells we install, weather conditions, etc. generally have an average payback of 5-10 years, after which the payback is This means that we will use that electricity for free for a long time. At least it has a lifespan similar to the warranty period of 25 years. However, solar cell equipment will deteriorate as it ages. Therefore, maintenance costs must be taken into account at this point.

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