Dáil Éireann Debate, Wednesday - 17 January 2024
90. Deputy Jennifer Whitmore asked the Minister for the Environment, Climate and Communications the allowable size of invertors on residential solar units; whether there has been a change in the size permitted; if so, the reason change was made; and if he will make a statement on the matter. [57061/23]
View answerThe current limits ESB Networks place on microgeneration connections to the grid are unchanged. Under the NC6 notification process, you can connect and register a micro-generator in parallel with ESB Networks provided the requirements under the "Conditions Governing the Connection & Operation of Micro Generation Policy" are met. www.esbnetworks.ie/docs/default-source/publications/conditions-governing-the-connection-and-operation-of-micro-generation-policy.pdf?sfvrsn=fdcb2515_17
Under the NC6 process, microgenerators are limited to system sizes of:
25 amperes (6kVA) at low voltage [230 volts] when the connection is single phase
16 amperes(11kVA) at low voltage [230/400 volt] when the connection is three-phase”
To provide clarity and simplicity, the export rating of 25A (approx. 6kVA) single phase or 16A/Phase (Approx. 11kVA) three phase, is assessed by ESBN based on the size of the Inverter through which the PV panels transport their generation. This is because the Inverter will limit any output to 6kVA/11kVA, even if there is an over-install of generation (above 6/11kVA) behind the inverter, for the purposes of increasing kWh production at times of lower light levels.
ESBN are aware of customers who have installed 6 kW inverters delivering above 25 amperes. For those who have already installed solar systems up to 6 kW which do not exceed 28A single phase, these regulations will not have a retrospective impact, provided they have submitted the necessary NC6 form before May 31st 2023. However, for installations after that date, full compliance with the regulations is required to ensure that the electricity system remains balanced and efficient.
There is still the option for customers to install units above 25A, under the NC7 or Mini-Generation connection process.
More information can be found here or by contacting ESBN. www.esbnetworks.ie/new-connections/generator-connections-group/micro-generators-
