Schurter has introduced a new standard
DC filter series FMER SOL suited for use on the DC side of the inverter
in photovoltaic systems. The filters are cURus approved up to 1000 VDC
and an ambient temperature up to 75°C.
Modern solar inverters, that use MPP (maximum power point)
trackers, generate disturbances into both the grid’s AC power line, as
well as the DC side of the solar module. An AC filter is normally used
on the grid’s AC power line, but the noise generated on the DC side
tends to be overlooked. EMC standards EN 61000-6-3 and EN55014-1,
however, also put limits on the noise generated from lines not connected
to the grid, such as for example the line to the solar panels. Meeting
these limits can be achieved by using a DC filter on the DC side of the
Large solar inverters installed in electrical installations will
generally require a cooling system. Components which provide high
temperature resistance simplify the system and reduce the energy needed
to cool. The FMER SOL filters are designed for rated currents from 25 A
to 1500 A at 55°C ambient temperature, and voltages up to 1200 VDC.
cURus approval for ambient temperature 55°C and 75°C with reduced
current. The filters are cURus approved for the following voltages for
types up to 150 A 600 VDC and 1000 VDC for types upwards of 250 A.
The FMER SOL DC filters are designed with screw clamps for types up to
150 A and copper bars for types upwards of 250 A. Other types of
connections, such as wires or copper bars <250 A, are available on
request. Small adjustments can also be made to the electrical circuit or
to the filter housing on request.
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This article originally appeared in EETimes Europe.