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New technical regulation C10/11

The new Synergrid C10/11 technical regulations were published on 1 September. These will enter into force on 1 November 2019.

Residential Storion systems (Smile B3, Smile 5 and Smile T10)

Only inverters complying with the new C10/11 may still be installed. The list of compliant inverters approved according to Synergrid C10/26 can be found here. Of course the residential products of AlphaESS are on this list. Regarding batteries, the inverter power of the solar panels and the battery for installations smaller than 10 kVA are NOT added together to determine the requirements.

For a single-phase connection to the distribution network, the sum of the PV inverters must still be smaller than 5 kVA. And the sum of the capacities of the battery inverters must also be smaller than 5 kVA.

For a three-phase connection to the distribution network, the sum of the PV inverters must still be smaller than 10 kVA. And the sum of the capacities of the battery inverters must also be smaller than 5 kVA.

The use of an EnFluri sensor becomes mandatory. 

An EnFluRi sensor is a bidirectional power sensor with a communication link to the energy storage system. The EnFluRi sensor used must comply with the requirements of the FNN Hinweis 'Anschluss und Betrieb von Speichern am Niederspannungsnetz'. The EnFluRi sensors used with the AlphaESS Smile (such as the ADL-3000 and Backup Box) are fully compliant. You can find the declaration of conformity here.

The installation of a digital net meter is not explicitly required by regulation C10/11. BUT it is compulsory to have the battery system tested and reported to the distribution network operator. The distribution network operators will, as a matter of priority, install digital meters for consumers. In practice, you will therefore be given a digital meter.

As a reminder: installing a digital meter does not necessarily mean that you can no longer enjoy the benefit of the reversing counter. You decide for yourself whether you still want to net or not. However, if you want to benefit from the Flemish support measure for home batteries, you are obliged to settle your bill based on actual consumption and injection.

Commercial Storion systems (T30, T50/100)

An important change for photovoltaic installations is that grid disconnection protection and safety interruptions are no longer required for installations up to 30 kVA. However, there are still a number of differences: 

A grid study is required for an installation up to 30 kVA, this is free for installations up to 25 kVA. However, this grid study can delay the project.

If you have a production installation larger than 10 kVA, a 4-quadrant meter and a green power meter must be installed (even if no injection is taking place). The meter box for decentralised production must also be installed.

By only requiring grid disconnection protection and safety interruption from 30 kVA, the barriers for installations < 30 kVA should be lowered. There are also other changes. Only inverters in compliance with the new C10/11 may still be installed. You can find the list of compliant inverters homologated according to Synergrid C10/16 here. Of course the commercial products of AlphaESSookare on this list. Furthermore, distribution system operators can make Telecontrol (RTU) mandatory from 250 kVA instead of 1 MVA. As far as batteries are concerned, the inverter power of the solar panels and the battery are added together to determine the requirements, and this in contrast to installations smaller than 10 kVA.

You can find the complete Technical Regulation C10/11 of Synergrid here.

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