Generation

Solar PV Panel

Cells in series make the voltage, cells in parallel make the current — the frame carries neither.

Photorealistic solar photovoltaic panel module

Real part — tap a marker

Solar PV Panel

Cells in series make the voltage, cells in parallel make the current — the frame carries neither.

Terminals

Positive (+) and negative (−) in the junction box
Bypass diodes — one per cell string, inside the box or laminate
Functional earth bond to the module frame

Tempered glass front — 3–4 mm, carries the mechanical load
Encapsulant (EVA) — seals the cells out of the weather
Mono or poly cells — typically 60 or 72, cut into half or third cells
Busbar and finger ribbons — collect current off each cell
Backsheet — the insulating rear layer
Junction box with bypass diodes and MC4 leads

Cutaway of a solar PV panel showing the tempered glass, encapsulant, silicon cells with busbar ribbons, backsheet and frame

Cutaway — tap a marker

⚡ Meet it in a circuit

15Solar PV with Battery StorageAdvanced

Terms used here

Defined in the glossary — each one opens at its own entry.

⚠ Safety note

A module in daylight is live and cannot be switched off — Voc sits just above the panel's maximum-power voltage and rises in cold weather. That is why DC isolators, MC4 connectors that can only be separated with a tool, and working on the DC side after dark (or under a cover) are non-negotiable.

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