Install Manual

Appendix E: External Lightning Protection
Connection
Protectiondevicesaremostofteninstalledfromeachdatalinetothelocalearthground,andshouldbe
selectedtobeginconductingcurrentatavoltageasclosetothesystem'snormalcommunicationlevelas
possible,butneverlower.ForRS485communicationlines,theselectedvoltageratingistypically6-8V.
Transientsuppressorsshouldbeinstalledascloseaspossibletotheportthatisbeingprotected,andthe
usermustprovideanextremelylowimpedanceconnectiontothelocalearthgroundoftheSolarEdge
device.Thisgroundconnectioniscrucialforpropersuppressiondeviceoperation.Theground
connectionshouldbemadeusingaheavygaugewireandkeptasshortaspossible.Ifthecablebetween
theSolarEdgedeviceandtheprotectiondevicemustbelongerthan1m/3.3ft.,acopperstrapora
braidedcableintendedforgroundingpurposesmustbeusedfortheprotectiondevicetobeeffective.In
additiontothehighfrequencynatureoftransients,extremelyhighcurrentmayflow.
Aprotectivedevicewithsurgedischargeratingsof In:10kA8/20μsandImax:20kA8/20μsis
recommended.
VariouslightningprotectiondevicesareavailableforRS485communicationlines.
ThediagrambelowshowsaconnectionexampleusingtheISKRAZAŠČITEVM-RS 485dataprotocol
protectiondevice.Adetaileddatasheetcanbefoundat:
http://iskrazascite.si/uploads/datasheet/1396000869.pdf.
Figure 19: Protection connection
SolarEdge SolarEdge Electricity Meter Installation Guide MAN-01-00270-1.0
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Appendix E: External Lightning Protection Connection