Standard vs Split Junction Box: Which Is Right for Your Solar Panel?

The choice between a standard and split solar junction box depends on your PV module design. As the industry shifts toward half-cut cell technology, split junction boxes have become the preferred choice for modern high-efficiency modules.

Standard Junction Box

- Single enclosure on back of panel
- Designed for 60-cell and 72-cell full-cell modules
- Lower cost, simpler assembly
- Suitable for legacy module designs

## Split Junction Box

- Two separate enclosures at top and bottom of module
- Designed for half-cut cell (144, 156-cell) and large-format (182 mm, 210 mm) modules
- Superior heat dissipation across shorter current paths
- Lower resistive losses = higher efficiency
- Preferred by Tier-1 solar panel manufacturers globally

## Helivon's Split Junction Box Range

| Model | Module Type | Power Range |
|-------|------------|-------------|
| SP01-B | 144 half-cut | 380W – 450W |
| SP02-B | 156 half-cut | 450W – 500W |
| SP03-B | 182/210 mm | 540W – 700W |

For modern high-output solar panels, Helivon recommends the SP03-B split junction box with IP68 rating.