1000V DC String Combiner Box – 1 String + Type 2 SPD + DC Isolator (WPPV-1S1)
The WPPV-1S1 is an IP65 plastic solar string combiner box designed for single-string PV installations requiring integrated DC isolation and surge protection. Rated for 1000V DC systems, it provides safe string termination, overvoltage protection, and local isolation in one installer-ready enclosure. Supplied complete with a DC rotary isolator and Type...
Read full descriptionThe WPPV-1S1 is an IP65 plastic solar string combiner box designed for single-string PV installations requiring integrated DC isolation and surge protection. Rated for 1000V DC systems, it provides safe string termination, overvoltage protection, and local isolation in one installer-ready enclosure.
Supplied complete with a DC rotary isolator and Type 2 DC surge protection device (SPD), this unit protects downstream inverter equipment from transient overvoltage while allowing safe maintenance isolation. The weatherproof IP65 enclosure makes it suitable for outdoor mounting in residential and light commercial solar installations.
Installer Tip: Ideal for single-string domestic PV systems where the inverter does not include integrated DC surge protection. Provides a tidy, regulation-ready solution at the array or inverter location.
Key Features
- 1 String / 1 Output configuration – suitable for single MPPT PV systems
- 1000V DC rated – compatible with modern solar arrays
- Type 2 DC SPD – protects inverter from transient overvoltage
- Integrated DC rotary isolator – safe local disconnection
- IP65 plastic enclosure – weatherproof for external installation
- Pre-configured internal wiring for faster installation
- Designed for residential and light commercial PV systems
Compare Solar String Combiner Boxes
| Model | Strings | Enclosure | Best For |
|---|---|---|---|
| WPPV-1S1 (This Product) | 1 String / 1 Output | IP65 Plastic | Single-string domestic PV systems |
| WPPV-2S2 | 2 Strings / 2 Output | IP65 Plastic | Dual MPPT or split-array systems |
| WMPV-1S1 | 1 String / 1 Output | IP65 Metal | Higher mechanical protection environments |
| WMPV-2S2 | 2 Strings / 2 Output | IP65 Metal | Commercial or exposed installs |
What is a solar string combiner box used for?
It provides safe string termination, DC isolation, and surge protection between the solar array and inverter.
Is this suitable for dual MPPT inverters?
No. For dual MPPT systems or two-string arrays, select the WPPV-2S2.
Does this include DC surge protection?
Yes. A Type 2 DC SPD is factory fitted to protect against transient overvoltage events.
Can this be installed outdoors?
Yes. The IP65 enclosure is weatherproof and suitable for external wall mounting.
What is the difference between plastic and metal versions?
The metal versions provide increased mechanical durability and are often preferred in commercial or exposed environments.
- Model: WPPV-1S1
- Configuration: 1 String / 1 Output
- Max System Voltage: 1000V DC
- Surge Protection: Type 2 DC SPD
- Isolator: Integrated DC Rotary Isolator
- Enclosure: IP65 Plastic
- Mounting: Surface Mount
- Application: Domestic & Light Commercial Solar PV
This combiner box must be installed by a qualified electrician in accordance with current solar PV installation standards.
- Install close to the inverter or at array location as per design
- Ensure correct polarity when terminating PV strings
- Verify SPD earth connection is short and correctly bonded
- Confirm DC voltage rating does not exceed 1000V
- Carry out full insulation and polarity testing before commissioning
