By installing a system solar panels at home it is possible reset (or at least reduce a lot) the bill and even receive money for the energy sold to the electricity service provider.
This, of course, is all known information and represents perhaps the greatest incentive that could push a person to consider installing their own roof panels.
Clearly there are many other things to consider and deciding to go solar is not as easy as it seems.
Let’s see if then It is advisable to install solar panels on the roof (or those on the balcony) and how much the actual saving is.
With solar panels you can save
The first point of the discussion on the installation of solar panels (roof or balcony) should be the relative one to the environmental impact e to energy independence.
Of course too the economic point of view is important and the savings on your bill it’s a fundamental factor (especially these days) that could really make a difference for many families.
First of all, we must think that for most people, switching to solar energy is a medium and long term investment.
As is well known, there is a certain “recovery period” and it essentially consists of the time necessary for recover the initial investment through monthly energy savings.
With solar panels it is possible to save on your bill and, by selling the energy produced to your operator, you can also earn money, but there are several variables to consider
How much this saving amounts depends on many unknowns, such as size of the systemil energy consumption of your home and many other factors.
Furthermore, we must also consider that excess energy it returns, as already mentioned, to the manager who will clearly pay it to the user.
We are not talking about such a significant gain but in any case, adding it to the savings on the bill, it can become an important income for your family.
However, the parameters described up to this point are not fixed vary from case to caseso first of all it is good to know how to estimate the actual savings on your bill.
Cost of the system and savings on the bill
To estimate the actual savings there is a formula that can be useful to know.
First you need to consider the initial cost of the installation clearly, all the costs must be subtracted from this any incentives receivedstate and non-state subsidies and discounts.
At this point you know the net cost of the systema fundamental figure for estimating actual savings.
Now you need to run a long-term monitoring and to do this you need to check the monthly savings on your electricity bill.
People often imagine that with i solar panels you can obtain all the energy needed to power your home, eliminating your electricity bill.
Installing a photovoltaic system can be an investment but, clearly, we must not forget about the initial expense which in some cases can be quite high
Of course this is not the case and furthermore to the taxes to be paidalso in this case several factors such as i come into play consumption of your familyil type of fare for electricity and of course environmental parameters which determine a greater or lesser production of electricity.
However, to check your monthly savings you just need to take into account the changes in the bill and check if your system really manages to eliminate costs (even with reimbursements from the electricity provider). With this information, calculating your annual savings is a rather obvious operation.
Given the data in hand, it is sufficient to consider the costs of installing the system (eliminating all incentives) and divide them by the annual savings. The result is the period of time necessary to recover the initial investment for installing the system.
Theoretically speaking, after that period of time, the user will no longer have electricity costs and, indeed, it might even have a I earn resulting from the sale of excess energy.
Solar panels in real life
Clearly the calculations made up to this point do not represent 100% the real cases and many variables come into play which could significantly lengthen the time needed to start saving with solar panels.
To this we must add that after a certain period of time, the panels will begin to produce less energy and therefore to make less.
Of course this is a long term perspective, about 20 or 25 yearsbut in any case it must be taken into consideration especially if we are talking about one very high initial cost which must be spread over a very long period of time.
Furthermore, we must also consider the increases in the bill which, obviously, are not directly proportional to the energy produced and, for example, a month could have a higher energy cost and lower production, perhaps because it was a particularly rainy period.
Clearly the opposite can also occur with a lowering the cost of energy and a particularly positive period for the production of electricity.
Therefore, in summary, the calculations seen up to this point are (theoretically) exact but must be contextualized based on the many variables mentioned above and, naturally, elaborated over time.
Types of photovoltaic systems and access to tax deductions
At this point it is appropriate to open a separate chapter to talk about the type of system to be installed also for those wishing to access the tax deductions and you have cousins government incentives.
Clearly there are different types of photovoltaic systems: There are those Grid Connectedi.e. connected to the national electricity grid.
Such a solution is convenient because housing will never have supply problems and, in the event of reduced production, the electricity grid will always be used.
Furthermore, with this system you can access the Tax Deductions and the user will be able to choose whether to stipulate a Spot Exchange contract (to compensate the energy produced with that consumed) or the Withdraw Dedicated (to sell the energy produced to the GSE).
The facilities Stand Alone which are not connected to the national electricity grid and accumulate the energy produced in special batteries.
This system can also be used by those homes that they do not have a direct connection to the national grid and they can still power their electronic devices using the energy they produce.
Of course such a solution is recommended for second homes where power consumption is not as important as that of a first home.
Finally there are the systems Storagea “hybrid” solution that combines the two types just mentioned and which, among other things, is the most common one.
Accessing state incentives and tax deductions can be an excellent solution for reducing installation costs and creating a photovoltaic system without the initial expense or with a partial expense
With the latter system, the energy produced is first stored in the batteries and, once these are 100% charged, the system itself will pour the “excess” energy onto the national electricity grid.
In this case the home will never have a lack of electricity that can be drawn from panels, batteries or the electricity grid.
This solution is better to use solar panels also to produce hot water (using a electric or hybrid condensing boiler) and allows you to significantly reduce consumption even if, to be honest, there could be problems in particularly cold areas.
Compared to a Grid Connected system, the energy produced and self-consumed is much higher (thanks to the batteries) with greater savings on the electricity bill.
Finally, a hybrid system can access tax deductions.
It must be underlined, however, that storage and hybrid systems have higher construction costs due, in fact, to the batteries which also have a very high price.