Solar PV Junction Box
Solar PV junction boxes provide a protected point to consolidate and connect string wiring before the combiner or inverter stage. This page helps you match enclosure material, IP rating, and terminal configuration to your array and site conditions.
What Is a Solar PV Junction Box
A solar PV junction box is an IP-rated enclosure that connects and protects DC string wiring at a common point, typically without the string-level fusing and surge protection of a full combiner box. It suits residential, off-grid, and string-transition applications where a few conductors are joined in a weather-sealed housing. TYPLE offers junction boxes in engineering plastic (PC+ABS) and metal (steel and stainless) enclosures, rated up to IP68, so one range covers standard rooftop through submersion-grade and corrosive-site installations. They are engineered to align with IEC 61439; enclosures are built to IEC 62208, with components sourced from certified supply-chain partners and component-level certificates available on request.
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TYPLE is a Wenzhou-based manufacturer of PV combiner boxes and DC protection components for solar and energy storage systems.
Get Your Quote Within 24 Hours
TYPLE is a Wenzhou-based manufacturer of PV combiner boxes and DC protection components for solar and energy storage systems.
Applications
- Residential rooftop: joins a small number of strings before the inverter.
- Off-grid & microgrid: protected wiring node in remote installations.
- Harsh / coastal sites: IP68 plastic (TP-N) or stainless-steel (TPM) enclosures for water- and corrosion-exposed locations.
Solar PV Junction Box Series
TYPLE offers four junction box series across plastic and metal enclosures. The table below compares them at a glance.
| Parameter | TPN Series | TPA / TPC Series | TPM Series |
|---|---|---|---|
| Enclosure material | PC+ABS | PC+ABS | Cold-rolled steel / SS304 / SS316 |
| Enclosure protection | IP68 | IP65 | IP65 |
| Flame-retardant rating | UL94 V-0 | UL94 V-0 | Metal (non-combustible) |
| Best-fit site | Submersion-grade / flood-prone | Standard outdoor rooftop | Corrosive / coastal / heavy-duty |
| Terminal & connector | Configurable | Configurable | Configurable |
Terminal count, connector type (MC4 / gland), and box size are configured to your array layout.
How to Choose By ingress protection
- IP68 (TP-N) for flood-prone or submersion-risk sites; IP65 (TPA / TPC) for standard outdoor rooftop.By enclosure material: PC+ABS for light-weight, UV- and corrosion-resistant plastic housings;
- steel or SS304 / SS316 (TPM) for heavy-duty, high-temperature, or corrosive coastal environments where stainless steel resists salt-spray degradation.
OEM & Customization
TYPLE offers OEM and ODM services for PV junction boxes, configuring enclosure material (PC+ABS / steel / stainless), IP class, terminal layout, and connector type to your project, with short lead times from the Liushi low-voltage supply hub. Send your string count and site conditions and we build to spec.
Frequently Asked Questions
A junction box joins string wiring at a common protected point; a combiner box adds string-level fusing and surge protection. Larger arrays generally need a combiner box, while junction boxes suit smaller or simpler wiring transitions.
The TP-N series is rated IP68 for submersion-grade sealing, making it the best fit for flood-prone or high-water-exposure installations; the TPA / TPC series is rated IP65 for standard outdoor use.
Yes. The TPM series is available in cold-rolled steel, SS304, or SS316, suited to corrosive, coastal, or heavy-duty environments where stainless steel resists salt-spray corrosion.
