Categories: Solar 2 Energy

Solar panels | How much electricity do solar panels generate

Solar panels |  How much electricity do PV panels generate. You can also make good use of solar energy in Portugal. The yield PV systems is sufficient to contribute to the energy consumption of a household. In addition to being useful for our climate, renewable energy, in combination with traditional power from the energy supplier, quickly results in significant savings in electricity bill.

Besides, you can save extra. By comparing energy for the electricity that you purchase from an energy supplier. So that you always pay the lowest price. At least as necessary of a solar installation is the sustainable way of electric generation and therefore, it is good for the environment.

Solar panels |  How much electricity do PV panels generate

The expressed capacity is in Wp (Watt peak), the nominal power. The energy a panel is suplying under the ideal test conditions in the production factory. The yield in kWh ( kilowatt Hour ). For the calculation of the expected return, we take a correction into account. Because the ideal conditions do not always occur once they are on the roof.

By default, we assume that the newest panel generates 370 Wp per hour. Our affordable Perc PV modules do deliver just that! This corresponds to 0.37 kWh. We multiply this by the correction factor 0.9. So our Perc panel produces an average of 0.37 X 0.9 = 0.33 kWh.

First, something about the temperature: the factory test off solar cells is at a temperature of 25 degrees. It’s is not about the ambient temperature, but about the heat of the panel. In sunny weather, the temperature of the modules can sometimes be 30 degrees higher than the ambient temperature.

It means that a panel in the summer with an ambient temperature of 30 degrees maybe 60 degrees. That is very hot. If we know that the power above 25 degrees decreases with 0.33% per degree, it is easy to calculate that at an ambient temperature of 30 degrees the energy decreases with 35 x 0.33% = 11.55%. The output will then be 0.291 kWh!

In other words: a hot sunny day is fun, but a cold day is much better.



How many photovoltaic panels are needed to power an average house?

An average household in Portugal Algarve uses around 1 kW per hour. Do you have a swimming pool, or do you use the air conditioning a lot? Then it is not strange that the average use is higher.

The biggist electra supplier in Portugal is the EDP. They have some rules for solar panel installation. I’m not going to list them all, but the most important is this one.

  • If your system is no larger than 1.5kw. Register without any license with SERUP ( Electronic Registration System) for free!

Additional costs will appear if you deliver more then 1.5kWh. We have to install an extra electricity production meter with a GPS tracker. The installation costs are 1500 euro and more.

In this example, you need 4 to 5 modules to cover the average power consumption. The surplus energy produced goes to the electricity company. There is no feed in tariff compensation for systems with a power output less than 1.5 kWh.

To be short: the most high efficiency panel system for the lowest price. Ask for more information.

How much does it cost to install solar panels?

Installation costs are much depending on your situation. We always make an appointment with our clients to investigate. Are they going to be on the roof or somewhere on the property? Length of the cables and accessibility to the electric cabinet are all installation details which influence the installation price.

Do you really save money?

With a PV system, you not only choose a sustainable solution, but you also save on your energy costs. What they exactly deliver varies per situation. Your energy consumption and the location of the roof determine your savings.

The products, as mentioned earlier, have a return less the five years. Besides, the panels will last 25 years. In typical situations, the inverters live time is 10 to 20 years. Therefore, after five years you’re the solar panel costs are free. The efficiency of your investment is growing.

Store your Surplus.

Saving generated electricity is for many the ultimate dream. By storing energy and using it later, you are entirely self-sufficient. Possible changes (such as the netting scheme) and rising energy prices. That are factors which may increase the demand for solar power energy storage as the storage battery market is developing.

What do you need for storage?

First of all, you naturally need batteries. The more storage you have, the more energy you can store. The energy stored in the batteries must, however, be made available again in the grid whenever you want. Therefore, it requires a battery inverter that converts the direct current from the batteries (DC) into the alternating current on the network (AC).

Batteries are expensive, and their lifespan is highly dependent on the way they are charged and discharged. The more “cycles” (times when charging and discharging) they undergo, the faster they lose capacity. In conclusion, you require a system with smart control that. For example, takes the weather forecast into account.

What does it cost to store solar energy?

The costs of such systems are highly dependent on the desired capacity. Batteries are the most expensive part, and the more batteries you insert, the more expensive it becomes. Furthermore, the battery inverters are also quite expensive. For an SMA or RCT battery inverter, you pay almost double what a PV inverter of the same capacity costs. The products for the smart control of the system are a lot cheaper, but they also amount to a few hundred euros. And finally, installation costs are also involved.

Is it worth the investment?

For now and for the coming years the netting rule applies in Portugal. That is to say that the public grid acts as a buffer for people with a PV system. Too much energy produced flows to the network. In Portugal, it is NOT settled one-on-one with the consumed power. That is why there is currently an economic added value to instal batteries in the home.