What are the rules for adding a storage system to a photovoltaic system?
And when you can install a storage system on an existing PV system, without losing the incentives?
The devices connected to distribution networks in low or medium voltage can be matched to an electric storage device for increasing the percentage of self-consumption while maintaining incentives, with one exception: those of power of less than 20 kWp regulated by the first energy bill.
The CEI Rules
After an initial series of economic evaluations that the user has already installed photovoltaic panels and wants to add a Storage System will have to play some important steps.
First, you must choose a system that meets the standards connection, which are the IEC and CEI 0-21 0-16 respectively for systems in low and medium voltage. These rules contain all the features of a astorage system, including measurement of energy patterns produced / exchanged with the network.
The installer in this case will own all the tools necessary to properly carry out its work: in addition of course to the aforementioned provisions CEI, we must remember the resolutions 574/2014 and 642/2014 of the Authority for Energy and the technical regulations published in followed by the ESO.
Declarations and Certifications
Secondly, the user will formalize the change of its plant at the network operator and the GSE, through a new connection request to enter the storage system.
But how you do you distinguish a storage technology accordance with the IEC as one that does not meet the mandatory requirements?
As for the systems connected to the low voltage, it is sufficient declaration in lieu of affidavit issued by the manufacturer. Declaration to be extended to all the components, that is, inverter, battery and control system.
As regards, however, the medium-voltage systems, the CEI 0-16 indicates the tests which submit an storage system. In addition to the manufacturer’s declaration, therefore, it serves the certification of an accredited body.
Storage systems and UPS
A UPS is designed to work only in emergency conditions, for example following a fault on the network. Usually this happens a few times a year and for a few minutes, just long enough to fix the problem that caused the interruption of electricity supply.
A Storage System, on the contrary, is intended to operate continuously in parallel to the distribution network. Its entry into operation is not dependent on a fault or an emergency, but is determined by the user according to his needs. For example, when he wants to take advantage of the stored energy in the battery to cope with a peak of consumption, reducing electricity levy from the network.