Generac Power Systems PWRcell Reference Manual page 128

Appendix A Definitions
SnapRS
String
Substring
Voc
124
Normally open frequency controlled switch used to achieve module-level shutdown for
the PVRSS
One REbus home run and up to three paralleled substrings (three PV Links each with
their own substrings connected in parallel to one home run).
A grouping of solar modules wired to the PV input of one PV Link
Open circuit voltage
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