A photovoltaic system is not equipped with a residential battery backup systems by default. The reason is that in some cases the storage of electricity is unnecessary. For example, if you consume a lot of energy during the day, hardly any solar power goes into the storage, because you use it directly or feed it into the grid. If, on the other hand, your demand increases in the evening or in winter, it is his sensible investment to retrofit the residential battery storage system.
Possibility of Retrofitting A PV Residential Battery Backup
From a technical point of view, retrofitting a photovoltaic residential battery backup is always possible in principle. However, not every solar battery storage model is suitable for such a retrofit. The decisive factor is whether your home battery storage system has a DC or AC connection. Whether the retrofit is ultimately worthwhile depends on your individual needs and your PV system. In addition, the following points determine whether the photovoltaic residential battery backup retrofit makes sense from an economic perspective:
● How high is your feed-in tariff?
● How old is your photovoltaic system?
● How high are the residential battery storage cost?
● How high is your current self-consumption quota?
If, on the other hand, you consider the purchase from the perspective of climate protection, then retrofitting the photovoltaic residential battery storage is always the better choice: You not only use more electricity generated by your solar modules, but also improve your personal CO2 balance.
Retrofit Photovoltaic Residential Battery Storage System: The Advantages
If you decide to retrofit photovoltaic residential battery storage system, you will not only benefit from better economic efficiency. You rely more on your self-generated electricity and thus become less dependent on your electricity supplier.
If you retrofit your photovoltaic residential battery storage system, you increase your self-consumption and are significantly more self-sufficient. Better values in consumption can be observed especially in single-family homes. While they usually register around 30 %, the rate increases to 50 to 80 % with residential battery.
In addition, you protect the environment in this way. Because currently less than half of the electricity from the public grid is renewable. If you rely on solar power, you will be making an active contribution to climate protection.
What Needs To Be Taken Into Account?
If you want to retrofit your photovoltaic residential battery backup, it is rarely a problem from a technical point of view. The question is therefore first and foremost whether the retrofit is profitable. It is also important whether your residential battery backup is equipped with an AC or DC connection.
If they are AC systems, then the residential battery backup is completely independent of the PV system. DC systems, on the other hand, are connected even before the alternating current funnel and are located directly behind the photovoltaic modules. This makes it much cheaper to retrofit your photovoltaic residential battery backup, which has AC.
For this reason, retrofitting is especially profitable if your PV system is relatively new. These models are designed accordingly to make photovoltaic residential battery backup retrofitting trouble-free.
How Big Should The PV Residential Battery Backup Systems Be?
How large the photovoltaic residential battery backup systems should be when retrofitting depends on various factors. The optimal capacity can be roughly measured by how high your own power consumption is. In addition, you should consider the size of your photovoltaic system when planning a PV system. The larger it is, the more residential battery capacity you will need.
In addition to these two factors, your personal reason for retrofitting is important. For example, is your goal to achieve the highest possible independence through photovoltaic residential battery backup systems retrofitting? In this case, a significantly larger residential battery is worthwhile than if you value the greatest possible economic efficiency.
For Whom Is A Solar Battery Backup Retrofit Worthwhile?
If you retrofit the photovoltaic residential battery storage, you will benefit from different advantages. You pursue the goal of increasing your energy consumption from self-generated solar power. Instead of being dependent on the public power grid during the late hours, you retrieve the self-generated and stored electricity during the day. Basically, photovoltaic residential battery storage retrofitting is worthwhile in the following cases:
● If your electricity consumption increases, especially towards evening.
● From the level of the electricity price.
● From the feed-in tariff that you receive for the surplus electricity.
Today it is worthwhile to use as much self-generated electricity as possible. There is a reason for this: In recent years, electricity prices have risen significantly, while the feed-in tariff has fallen. It is currently lower than the current electricity price, which makes feeding electricity into the grid only slightly attractive. This difference also means that retrofitting photovoltaic residential battery backup power systems is worthwhile in most cases. This way you have the possibility to cover your own consumption more by your own residential batteries. It makes particular sense to integrate an electricity storage system directly into a new system.
Basically, if you have installed your PV system after 2011, you will benefit from retrofitting a photovoltaic residential battery backup power systems.
How Is An Residential Battery Backup Retrofitted?
If you want to retrofit your photovoltaic residential battery backup, you usually do not have to change anything in your PV system. The additional PV residential battery backup is installed between the alternating current controler and the sub-distribution. For you, this means that as soon as you retrofit a photovoltaic residential battery backup, the excess energy is not automatically fed into the public power grid. Instead, the energy is loaded into the solar battery backup.
If you ever need more energy than your photovoltaic system produces, the power is first taken from the solar battery backup. Only when this reserve is used up do you draw energy from the public grid.
Important for you: When retrofitting a photovoltaic residential battery backup, a battery inverter is used. After all, the electricity is to be stored as grid-standard alternating current. When retrofitting a photovoltaic residential battery backup, two elements are therefore added to the system: the solar battery itself and the solar battery inverter.