1500V Solar DC Disconnect Combiner Box

The 1500V Solar DC Disconnect Combiner Box, supplied by China manufacturer Zhejiang Soutya New Energy LLC, is a 1500 V DC PV combiner unit featuring an aluminum alloy enclosure and IP66 protection that ensures high durability and reliable outdoor performance. The device integrates critical safety components including DC surge protective devices, DC isolators, and a main DC isolating switch. It is designed to deliver comprehensive isolation, leakage, and grounding protection in photovoltaic systems.

Technical Parameter

Wiring Diagram

Application scenarios

1.Utility-scale PV fields – Central inverter aggregation

Floor-mounted on steel cross-arms between tracker rows, the 12-in-1 box consolidates a dozen 1500 V strings into one homerun cable. Individual fuse holders protect each string against reverse-current faults, while twin SPDs (± and PE) clamp lightning surges induced across long DC runs. The main rotary isolator delivers visible-break isolation at the combiner, allowing maintenance crews to lock-out the entire 1500 V bus before work on the central inverter or transformer.

2.Large commercial rooftops – Multi-MPPT string grouping

Installed on ballasted trays across expansive flat roofs, the unit feeds 12 separate strings into a single MPPT input of a 250 kW inverter. String-level fusing prevents fault propagation between arrays, and the isolator gives electricians a local disconnect point during inverter replacement or IR-scan inspections, eliminating the need to shut down the whole rooftop.

3.Agro-voltaic installations – Elevated tracker combiners

Suspended on pylon structures above crop rows, the enclosure aggregates power from elevated bifacial modules. IP66 sealing blocks irrigation spray and dust, while dual SPDs protect against summer thunderstorms common in rural plains. The isolator switch enables farmers to safely de-energise DC circuits before adjusting tracker tilt or servicing irrigation booms.

4.Industrial micro-grid yards – DC-coupled storage fronts

Plinth-mounted at the edge of solar car-ports linked to battery containers, the combiner merges 12 strings into a 1500 V DC bus feeding PCS chargers. Busbars rated 400 A continuous handle storage charge/discharge cycling, and the isolator provides emergency shutdown for fire fighters when integrated with the micro-grid’s arc-fault detection system.

5.Remote desert solar plants – Long-string harsh-environment hubs

Fixed on concrete pads amid desert arrays, the box withstands 55 °C ambient and wind-blown sand. Twin SPDs safeguard against distant lightning strikes on kilometres of DC cabling, while the main isolator allows night-time lock-out without inverter exposure, ensuring minimal downtime during module cleaning or tracker motor swaps.