PV Distribution

24-Way Solar Combiner Box 1000V DC IP67 CE

Walax 24-string solar combiner box rated 1000V DC to IP67 for commercial and utility-scale PV plants. Pre-wired with per-string DC fuses, a 4-pole DC isolator and 3-pole DC surge protection; CE-certified and tested to IEC 61439-2 for PV string-protection assemblies.

24-String 1000V DC

24 PV strings paralleled at up to 1000V DC with per-string gPV fuses for utility-scale and large commercial arrays.

4-Pole DC Isolator

Integrated 1000V DC 4-pole load-break switch for safe array isolation during maintenance and emergency.

IP67 Anti-UV SMC

Glass-fibre reinforced polyester enclosure rated IP67 with anti-UV, anti-acid, alkali and moisture protection for harsh outdoor sites.

Specifications

Technical Specifications

Standard ratings listed below – custom configurations available on request. Contact our engineers to confirm parameters for your market.

Standards	IEC 61439-2 · CE
Number of input strings	24 (one fuse per string)
Max PV system voltage	DC 1000V
Rated current per string	15A / 20A per string (customisable)
Max total DC output current	Up to 250A – 360A
DC fuses	gPV 1000V DC, 20A per string (dual fuses per string option)
DC isolator switch	4-pole DC 1000V load-break switch, 250–400A
DC surge protection	3-pole DC 1000V SPD, In 20kA, Imax 40kA, Up ≤ 3.8kV
Enclosure material	SMC glass-fibre reinforced polyester / hot-dip galvanised steel / stainless steel
Enclosure rating	IP67 (IK09 impact, anti-UV)
Cable entry	Bottom PG9/PG11/MC4 input · PG21–PG29 output
Operating temperature	-40°C to +85°C
Humidity	0 – 95 % RH, non-condensing
Altitude	Up to 4000 m (derating above 3000 m)
Dimensions (W×H×D)	850 × 500 × 200 mm (typical 24-way)
Monitoring	Optional string-current / voltage / SPD-status module, RS485 Modbus-RTU

Applications

Where These Combiner Boxes Install

Commercial and utility-scale solar farms, ground-mounted PV plants, industrial rooftops, agricultural pumping arrays and battery-coupled PV systems where 24 PV strings must be combined safely up to 1000V DC.

FAQ

Frequently Asked Questions

Is it suitable for utility-scale projects?

Yes – the 24-string 1000V DC architecture, 250–400A DC isolator and IP67 SMC enclosure are engineered for utility-scale and large commercial arrays.

What is the maximum DC voltage?

1000V DC standard. 1500V DC versions are available for next-generation utility-scale plants.

What is the enclosure rating?

IP67 with IK09 impact and anti-UV performance, suitable for high-humidity coastal and desert sites.

Can the fuses be replaced on site?

Yes – standard 10×38mm gPV fuse holders accept replacement fuses without tools.

Does it include surge protection?

Yes – a 3-pole 1000V DC SPD (In 20kA / Imax 40kA) protects the system from lightning-induced surges on both poles.

Can it be supplied with monitoring?

Yes – an optional smart module reports per-string current, bus voltage, SPD and breaker status over RS485 Modbus-RTU for SCADA / plant monitoring.

What standards does it meet?

IEC 61439-2 design and type-tests, with CE documentation. Country-specific certifications (SONCAP, PVOC, SABER) on request.

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