Series voltage, parallel current and reverse-current paths
- PV string / parallel strings
Series modules add string voltage; parallel strings add current paths. Evaluate both voltage and current for entries and connectors.
- Branch / Y connector
The branch connects the specified circuits through a matched connector system. Confirm polarity, current duty and permitted mating parts.
- Combiner box
The enclosure groups the intended string circuits and components. Its entries, protective devices and DC ratings belong to the full design.
- Reverse currentThis term
Other parallel branches can drive current into a faulted branch. Check the credible current and the required protective arrangement.
- Overcurrent protection
The device responds to excessive current within its stated duty. Coordinate its rating and response with cable and equipment limits.
- Short-circuit protection
The protective arrangement must handle the prospective short-circuit current and energy. Its DC interruption duty must match the circuit.
Series strings and parallel branches create different circuit duties. A combiner organizes the branches, while reverse-current exposure and protective devices require the complete array design.
Conceptual partial circuits with polarity omitted. These are not installation wiring diagrams or fuse-sizing instructions; voltage, current, isolation and protection follow the approved system design.