Tech Brief Template

Tech Brief Template
TECHNICAL BRIEF
Power Line Filter Solutions for Single-Phase Applications
In an Enphase Microinverter System, the microinverters and the Envoy Communications Gateway use power
line communications (PLC) technology to connect and communicate. The Enphase System transmits
communication signals at 144 kHz across the same conductors that carry on-site AC system power.
When multiple Envoys are located on a single utility transformer or when site loads generate electrical noise
that disrupt communications, you can use power line filters to separate individual Envoy domains or to filter
out electrical noise.
When installing a power line filter with an Enphase Microinverter System, follow these requirements:




Separate the Envoy and the microinverters from other site loads
Place the power line filter in-line between the microinverter subpanel and the main AC load center
Size the filter for the ampacity (current rating) of the system
Protect the filter with an appropriate circuit breaker
WARNING: When using a filter, always install the PV Array and any Enphase AC Batteries on
the same electrical load side as the Envoy-S Metered. A filter installed between the Envoy and
PV Array or AC Battery(ies) will prevent the system from functioning.
Radius Power (www.radiuspower.com) manufactures electromagnetic interference (EMI) filters that provide
power line filtering when applied in Enphase installations. Enphase provides this information about Radius
Power filters but recommends that you contact the manufacturer or the Radius Power distributor to
determine the exact PLC filter requirements for your PV installation.
Although the Radius Power RP125 series is adequate for some single-phase systems, a more reliable and
robust solution for PLC filtering incorporates the Radius Power dual-stage design RP230 or RP240 series.
The dual-stage design provides higher performance.
Dual Stage Power Line Filters for Single-Phase Applications
Radius Power Series
Part Number
Rated Current (Amp)
RP230
RP230-30-10-S
30
RP230
RP230-40-10-S
40
RP240
RP240-80-10-S
60
To find out more about Radius Power EMI filters used in Single-Phase Applications, visit
http://www.radiuspower.com/emi-filters/single-phase-emi-filters.
To view the RP230 data sheet is available, visit
http://www.radiuspower.com/emi-filters/single-phase-emi-filters/rp230-series-detail
For orders, email emifiltercs@astrodynetdi.com or call 714-289-0055.
1
 2016 Enphase Energy Inc. All rights reserved.
October 2016
Power Line Filter Solutions for Single-Phase Applications
Ferrite Toroids
In some applications, you can use a ferrite toroid to block electrical noise. To install a ferrite toroid, pass the
conductors that connect the PV subpanel and the main AC panel through the toroid (excluding neutral). For
example, the Epcos B84144A0200R140 toroid distributed by Digi-Key.
To find out more about the Epcos toroid, visit
http://www.digikey.com/productsearch/en?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=495-3871-ND&x=0&y=0.
The Epcos toroid listed above will saturate at currents above 20A. For commercial applications and larger
residential systems, consider using a ferrite toroid from Magnetics, Inc. (part number C055433A2).
Schematic
Main
Service
Meter
Envoy-S Metered
Production CT
Consumption CTs
Radius
RP-230-40-10-S
Load
Line
Enphase AC Batteries
15
15
20
20
20
20
Neutral
Ground
Neutral
120/240V
Solar Subpanel
Ground
120/240V AC
Main Service Panel
Filter Detail
Radius RP-230-40-10-S
In Electrical Enclosure or Panel
Envoy, PV,
and AC
Batteries on
Load Side
of Filter
2
Load Side
L1
L2
Line Side
L1
L2
G
Main
Service on
Line Side of
Filter
Neutral
Not Connected to Filter
 2016 Enphase Energy Inc. All rights reserved.
October 2016
Power Line Filter Solutions for Single-Phase Applications
Filtering an Individual Load that is Causing Noise
In many instances, a specific load at the site may be causing the electrical noise that is interfering with the
power line communication between the microinverters and the Envoy. In that situation, use a filter for the
individual load.
Electrical noise sources often include light dimmers, touch lamps, EV chargers, fluorescent lighting ballasts,
or any device with a switching power supply (wall warts). If a 120V appliance causes a noisy electrical load,
plugging that device into a power strip with surge protection may filter the noise.
Filtering 240V Loads with a Power Line Filter
Radius RP-230-30-10-S
In Electrical Enclosure or Panel
240V
Electrical
Load on
Load Side
of Filter
Load Side
L1
L2
Line Side
L1
L2
G
Main
Service on
Line Side of
Filter
Neutral
Not Connected to Filter
Filtering 120V Loads with a Power Line Filter
Radius RP-230-30-10-S
In Electrical Enclosure or Panel
120V
Electrical
Load on
Load Side
of Filter
3
Load Side
L1
L2
Line Side
L1
L2
G
Main
Service on
Line Side of
Filter
Neutral
Not Connected to Filter
 2016 Enphase Energy Inc. All rights reserved.
October 2016
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