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Hi There
Trying to rectify a solar installation also containing a double socket in a horticultural location.
Current setup does not have any RCD protection.
Solar setup: 3 phase TNC-S supply - 3 x Solarlake 17000TL inverters - 50kW installation
The problem I am having is selecting the correct RCD's.
RCD 1. Main RCD supplying feed to horticultural unit
RCD 2. Option 1. Individual RCD's feeding each inverter in horticultural unit
Option 2. Single RCD feeding 3 inverters in parallal
Unfortunately Solarlake has collapsed but I found contact details of a company offering support who recommended the following: '100mA per phase which means 300 mA per inverter which means 1A per 3 inverter Type A'.
I requested the DC current generated by each inverter to determine if a type A RCD was suitable to protect all 3 inverters in parallel but the technical support would not provide me with a figure & kept repeating a type A device would be suitable. What type would you install or more info needed?
This is what the manual says:
RCMU breaker should be installed between inverter and grid, and its rated fault current need to be 100 mA≤Ifn≤300 mA, 0.1S. No load should not be connected to the inverter directly.
I don't understand what this is supposed to mean: 100 mA≤Ifn≤300 mA?
With such a high Earth leakage would it be better to provide each inverter with it's own independent 300mA RCD rather than designing a system with a combined 1A earth leakage? Unfortunately that adds to the materials cost.
How can I meet Special locations Reg 705.411.1 'In Horticultural circuits, whatever the type of earthing system, the following disconnection devices shall be provided (Option iii) In all other circuits, RCD's with a rated residual operating current not exceeding 300mA' for the RCD supplying the distribution circuit to the barn & option 2 if that is chosen?
Thanks for your advice
Trying to rectify a solar installation also containing a double socket in a horticultural location.
Current setup does not have any RCD protection.
Solar setup: 3 phase TNC-S supply - 3 x Solarlake 17000TL inverters - 50kW installation
The problem I am having is selecting the correct RCD's.
RCD 1. Main RCD supplying feed to horticultural unit
RCD 2. Option 1. Individual RCD's feeding each inverter in horticultural unit
Option 2. Single RCD feeding 3 inverters in parallal
Unfortunately Solarlake has collapsed but I found contact details of a company offering support who recommended the following: '100mA per phase which means 300 mA per inverter which means 1A per 3 inverter Type A'.
I requested the DC current generated by each inverter to determine if a type A RCD was suitable to protect all 3 inverters in parallel but the technical support would not provide me with a figure & kept repeating a type A device would be suitable. What type would you install or more info needed?
This is what the manual says:
RCMU breaker should be installed between inverter and grid, and its rated fault current need to be 100 mA≤Ifn≤300 mA, 0.1S. No load should not be connected to the inverter directly.
I don't understand what this is supposed to mean: 100 mA≤Ifn≤300 mA?
With such a high Earth leakage would it be better to provide each inverter with it's own independent 300mA RCD rather than designing a system with a combined 1A earth leakage? Unfortunately that adds to the materials cost.
How can I meet Special locations Reg 705.411.1 'In Horticultural circuits, whatever the type of earthing system, the following disconnection devices shall be provided (Option iii) In all other circuits, RCD's with a rated residual operating current not exceeding 300mA' for the RCD supplying the distribution circuit to the barn & option 2 if that is chosen?
Thanks for your advice