ELNUIMEX 4-String PV Combiner Box — IP65 Metal Enclosure with 20A Fuses & 63A Main Breaker

ELNUIMEX 4-string PV Combiner Box is a weatherproof metal enclosure that safely joins up to four solar panel strings, with individual 20A fuses, a 63A main circuit breaker and built-in lightning surge protection.

This compact combiner organizes PV array outputs into a single protected feed for inverters or charge controllers. Built from metal with a spray-plastic finish and rated IP65, it keeps connections dry and secure outdoors. Pre-wired inputs, included MC4-style connectors and a keyed lock simplify installation and maintenance while helping isolate faults without shutting down an entire array.

How does this combiner box protect my solar array?

The unit combines overcurrent protection, a main breaker and a high-voltage arrester to reduce the risk of damage from faults and transient surges. Protection levels are chosen to suit most small commercial and residential PV setups.

• Four independent 20A fuses isolate and protect each string from overcurrent.
• A 63A-rated circuit breaker provides main-line overload and manual disconnect capability.
• Integrated lightning/surge arrester mitigates transient high-voltage events from strikes or switching.
• 9 AWG internal wiring and robust components reduce heat and connection failures.

What makes it suitable for outdoor installation?

The enclosure is engineered to stand up to weather and UV exposure while keeping electrical connections safe and accessible. IP65 ingress protection and a durable finish help prevent corrosion and water ingress.

• IP65-rated metal box with spray-plastic coating resists dust and water jets.
• Pre-sealed cable entries and gaskets maintain enclosure integrity.
• Key-lockable door secures terminals from tampering and accidental access.
• Durable solar-rated wires and connectors resist sunlight and mechanical wear.

How easy is installation and routine maintenance?

ELNUIMEX designed the box for quick, straightforward setup: pre-wired internal connections and plug-and-play connectors reduce on-site wiring time. The keyed lock and organized layout also make selective servicing fast and safe.

• All internal wiring pre-installed; four pairs of connectors included for direct PV inputs.
• Standard mounting footprint fits regular walls, posts or racks with basic tools.
• Keyed door allows controlled access for fuse replacement and breaker operation.
• Clear layout minimizes downtime by isolating only affected strings during maintenance.

Will it work with both grid-tied and off-grid systems?

Yes — the combiner is compatible with small to medium grid-connected and off-grid PV installations. It aggregates string outputs into a single protected feed that connects to inverters or charge controllers.

• Suitable for string arrays where single-string currents do not exceed 32A each.
• Main breaker and fuses sized for common residential and light commercial inverters.
• Surge arrestor adds a layer of protection when systems are exposed to lightning-prone areas.
• Works with most MC4-style solar connectors and standard PV components.

Who is this for? Installers, system integrators and homeowners looking to centralize and protect multiple PV strings will find this combiner box practical and reliable. It is aimed at small commercial systems, residential arrays and off-grid setups where straightforward, weatherproof string aggregation and overcurrent plus surge protection are needed. If you need a compact, pre-wired solution with clear serviceability and keyed access for safe maintenance, the ELNUIMEX 4-String PV Combiner Box is designed for those requirements.