Do you know why there are 3 junction boxes in half-cell modules?

Junction boxes play a fundamental role: protecting the electrical connections between the cables and the module, as well as the bypass diodes or CBS.

In half-cell modules, you will typically find 3 boxes that divide the module's electrical layout into the following series:

🔌 The input cable.

1️⃣ The first junction box, which connects in parallel the first 2 series of cells and a bypass diode.

2️⃣ The second box, which connects in parallel the 2 intermediate series of cells and a bypass diode.

3️⃣ The third box, which connects in parallel the last 2 series of cells with another bypass diode.

🔌 The output cable.

This design is very simple but very effective.

It divides the module into “submodules” to allow the current from shaded cell series to be bypassed through the bypass diode or CBS. This prevents the shading from affecting the generation of the entire module or the entire series of modules and extends their lifespan by avoiding hot spots. 😎