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Replacing a 4kW transformer based inverter for a PV system

LittlePlumb
Hi All,

Can anyone assist me please? We installed a 4kW two string PV array in 2011 utilising an inverter which had a transformer and hence galvanic isolation. The inverter has broken and needs replacing, however, inverters these days all seem to be transformerless. Does anyone know where I can purchase a transformer based inverter pls?

Pete
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    Hi Jam. I have taken a look at the latest COP, which as you say requires that one installs Array Frame earthing. Not sure I like the sound of connecting the functional earth of the array to the MET on the TNC-S PME supply tho...Also RCD's are no longer necessarily required, and the PV array Earth insulation fault thresholds are only a min of 30 k ohms to earth. Seems like the original spec has been flipped on it's head. Functional earthing of an anodized Aluminium array is going to be fun if galvanic corrosion is to be avoided.
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    Hi Jam. I have taken a look at the latest COP, which as you say requires that one installs Array Frame earthing. Not sure I like the sound of connecting the functional earth of the array to the MET on the TNC-S PME supply tho...Also RCD's are no longer necessarily required, and the PV array Earth insulation fault thresholds are only a min of 30 k ohms to earth. Seems like the original spec has been flipped on it's head. Functional earthing of an anodized Aluminium array is going to be fun if galvanic corrosion is to be avoided.
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