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Domestic EESS, island mode and island mode isolator

Downdraft

Hello,
I need some help please Slight smile

I am trying to understand if an 'Island mode' isolator is required for this particular inverter design.

The Solar PV Hybrid inverter has an 'EPS' (emergency power supply) output that we would like to use.
The inverter has an internal N-PE Bond relay.
In connected mode this takes its power direct from the grid.
In island mode the Hybrid inverter will have disconnected from the grid as per G98/99, and then the EPS is supplied from PV and/or battery.

So if the inverter is designed to disconnect from the grid during grid loss/outside protection limits is either an Automatic or manual changeover switch required?

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  • 0

    What are you going to do with the EPS output?

    My inverter has an islanded mode output, and a big rotary switch to connect the house consumer unit to either grid or inverter.  You may not need that if tou intend to connect the EPS output only to specific appliances.

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  • 0

    What are you going to do with the EPS output?

    My inverter has an islanded mode output, and a big rotary switch to connect the house consumer unit to either grid or inverter.  You may not need that if tou intend to connect the EPS output only to specific appliances.

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  • 0 in reply to Simon Barker

    The EPS output is rated at 5kVA but we only plan to connect say fridges, freezers and internet router. May be some lights so only small loads.

    These loads will only be connected to the EPS output so I am trying to understand if an additional island mode isolator/generator changeover switch is required in this scenario as the inverter will disconnect from the grid for island mode

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