Konrak 1000PV DC Combiner Box
Also called a solar combiner box, string combiner box or PV junction box, the Konrak 1000PV gathers the photovoltaic strings of a 1000 V array into one or two protected DC outputs. Every string is individually fused, the DC bus is protected by a Type II surge protector, and the output passes through a DC isolation switch or circuit breaker — all in a sealed IP65 enclosure.
What is a PV combiner box?
A combiner box is the point where the strings of a solar array are brought together. It combines the string currents, protects each string, and gives the DC side a single, protected output and a clear isolation point.
What it does
A combiner box gathers several PV strings into one or two protected DC outputs, so fewer, larger cables run to the inverter.
Why it matters
It is the safety barrier of the DC side: string over-current protection, surge protection and a manual isolation point in one enclosure.
Where it fits
Installed between the solar panels and the inverter, close to the array, in a sealed outdoor enclosure.
From many strings to one protected output
The 1000PV combiner box sits on the DC side, between the PV strings and the inverter. Each string is fused on entry, the combined bus is surge-protected, and the output is switched before it leaves for the inverter.
1 · Strings arrive
The DC positive and negative of each PV string enter the box through MC4 connectors or cable glands.
2 · Each string is fused
A dedicated DC fuse on every string isolates a faulted string before it can affect the rest of the array.
3 · Surge protection
A Type II DC surge protective device clamps lightning and switching surges to a safe level.
4 · One protected output
The strings are paralleled on a busbar and leave through a DC isolation switch or DC circuit breaker to the inverter.
Single, dual and triple outputs, at 1000 V
The 1000PV series is built in single-output, dual-output and triple-output versions, from one string up to four, so one enclosure family covers a small household array and a multi-string commercial roof.
The Konrak model code is built from the system voltage and the wiring: 1000 = DC 1000 V system, PV = photovoltaic, the first number is the number of input strings and the number after the dot is the number of outputs — so 1000PV4.2 is four strings in, two outputs out.
| Model | Inputs / outputs | Inverter MPPT | Fuse per string | Output breaker | Dimensions (mm) |
|---|---|---|---|---|---|
| 1000PV1.1 | 1 in / 1 out | 1 | 10 – 30 A | 16 / 20 / 32 A | on request |
| 1000PV2.1 | 2 in / 1 out | 1 | 10 – 30 A | 32 / 63 A | 258 × 298 × 125 |
| 1000PV2.2 | 2 in / 2 out | 2 | 10 – 30 A | 32 / 63 A | 258 × 298 × 125 |
| 1000PV3.1 | 3 in / 1 out | 1 | 10 – 30 A | 32 / 63 A | 258 × 298 × 125 |
| 1000PV3.3 | 3 in / 3 out | 3 | 10 – 30 A | 32 / 63 A | on request |
| 1000PV4.1 | 4 in / 1 out | 1 | 10 – 30 A | 32 / 63 / 125 A | 258 × 298 × 125 |
| 1000PV4.2 | 4 in / 2 out | 2 | 10 – 30 A | 32 / 63 A | 285 × 410 × 130 |
1000PV1.1
One string in, one protected output.
1000PV2.2
Two strings in, two outputs for a dual-MPPT inverter.
1000PV3.1
Three strings in, one protected output — a common commercial roof size.
1000PV3.3
Three strings in, three outputs for multi-MPPT inverters.
1000PV4.1
Four strings in, one protected output for a larger array.
1000PV4.2
Four strings in, two outputs for a dual-MPPT inverter.
Transparent inspection cover
A clear, latched cover shows the state of the fuses, breaker and surge protector without opening the enclosure.
Sealed, outdoor-ready body
Engineered-plastic enclosure, sealed to IP65 and rated for impact to IK10.
Wall-mounting format
A slim enclosure that mounts on a wall or rail close to the strings.
Dimensions are the enclosure size without connectors. Higher string counts and bespoke input/output combinations are available to order.
Metal-enclosure combiner boxes, too
Alongside the engineered-plastic boxes on this page, we also build PV combiner boxes in cold-rolled steel enclosures with a UV-resistant powder coating. They share the same electrical design, but are made for larger arrays, higher string counts and higher currents, with strong resistance to corrosion, acid and alkali for harsh outdoor and utility sites.
Cold-rolled steel
A heavy-duty steel enclosure with a UV-resistant powder coating for tough outdoor and utility environments.
IP65 · IK10
The same IP65 protection and IK10 impact rating as the plastic range, with excellent corrosion resistance.
Built around your array
Larger string counts and higher currents, with fuses, surge protection and DC breakers configured to the project.
Metal enclosure
A cold-rolled steel cabinet with a UV-resistant powder coating, sealed to IP65.
Built-in protection
The same fuse, surge and DC-breaker configuration, wired and tested in the factory.
Ready to connect
MC4 connectors or glands at the base, with clear string labelling.
Tell us your array size, string current and number of inverter inputs — we will propose a plastic or a metal enclosure to suit. Metal-enclosure versions are quoted to order.
Three ways to wire it
The same box can be supplied to suit the way you install: plug-and-play MC4 connectors, weatherproof PG glands, or free wiring on DIN-rail terminals.
MC4 connectors
PV string inputs and the output can be supplied with MC4-compatible connectors, factory pre-wired for plug-and-play installation with no field crimping.
PG cable glands
Weatherproof PG glands for installers who prefer to bring their own cable; the cable entry is at the bottom of the enclosure to shed water.
Terminal block / free wiring
DIN-rail terminals and a copper busbar inside let the box be supplied loose or free-wired on site, matching the installer's own wiring scheme.
DC output switch
The output is taken through a DC isolation switch (standard) or a DC circuit breaker (optional), providing a lockable isolation point for maintenance.
MC4 or PG — your choice
Order with MC4-compatible connectors pre-wired for plug-and-play, or with PG glands if you prefer to bring your own cable.
Pre-wired inside
The box leaves the factory wired and tested, so the array is connected quickly and the same way every time.
1000PV technical data
| Product type | PV DC combiner box / string combiner box |
| Series | Konrak 1000PV — DC 1000 V system |
| Rated voltage Ue | DC 1000 V |
| System | Single-MPPT inverters (1 output) or dual-MPPT inverters (2 outputs) |
| PV strings | 1 – 6 strings |
| Maximum input current per string | 10 / 15 / 20 / 25 / 30 A (6 – 30 A on six-string models) |
| Rated input current (fuse) | 1 – 32 A |
| Maximum output current (breaker) | 16 – 125 A (20 – 125 A on six-string models) |
| Number of poles | 3P |
| String protection | DC fuse, one per string (gPV) |
| Surge protection | DC SPD, Type II · Uc 1050 V · In 20 kA · Imax 40 kA · Up 3.6 kV |
| Output switch | DC isolation switch (standard) / DC circuit breaker (optional) |
| DC breaker ratings | Icu 6 kA · Uimp 4 kV |
| Enclosure | PC + ABS engineering plastic, V-0 flame-retardant, UV-resistant, impact-resistant |
| Protection grade | IP65 · impact level IK10 |
| Connectors | MC4 or PG (selectable) |
| Internal wiring | Pre-wired, plug and play (or free-wired on request) |
| Installation | Wall mounting |
| Operating temperature | −25 … +60 °C |
| Humidity | ≤ 95 %, no condensation |
| Altitude | ≤ 2000 m |
| Standards | IEC 60947-2 · IEC 61643-31 · IEC 60269-6 · IEC 60529 (design per CGC/GF 037:2014) |
| Certification | CE · TUV · CB · UKCA · RoHS |
| Warranty | 18 months |
| Surge protection (DC SPD) | Value |
|---|---|
| Type | Type II (Class II) |
| Maximum continuous operating voltage Uc | 1050 V DC |
| Nominal discharge current In (8/20 µs) | 20 kA |
| Maximum discharge current Imax (8/20 µs) | 40 kA |
| Voltage protection level Up | 3.6 kV |
Ratings shown are for the standard 1000 V models. Current, fuse and connector specifications are selectable — please confirm against the datasheet for your project.
Three layers of protection inside
Over-current, surge and isolation protection are integrated in a single enclosure, so the DC side is protected from the string all the way to the inverter.
String fuse (one per string)
A gPV DC fuse on every string clears a faulted string and stops a single fault from spreading through the array.
Type II DC surge protector
Protects the DC bus against lightning and switching surges with 20 kA nominal / 40 kA maximum discharge current.
DC isolation switch / breaker
A manual isolation point rated to 125 A with 6 kA breaking capacity — the safe way to work on the array.
IP65 — proof against rain
Sealed to IP65 and certified by water-ingress testing, for outdoor mounting beside the array.
V-0 flame-retardant body
A self-extinguishing enclosure that reduces fire risk if a fault ever occurs.
Stable in extremes
Rated from −25 to +60 °C, up to 95 % humidity and 2000 m altitude.
Why the 1000PV
IP65 outdoor enclosure
PC + ABS housing, UV-resistant and impact-resistant (IK10), sealed for outdoor mounting next to the array.
Pre-wired, plug and play
Supplied wired internally with MC4 or PG connections, so installation is quick and repeatable on site.
Fuse + SPD + breaker in one box
Over-current, surge and isolation protection integrated in a single enclosure to protect the whole DC side.
V-0 flame-retardant body
The enclosure is flame-retardant to V-0 and self-extinguishing, reducing fire risk in the event of a fault.
Stable from −25 to +60 °C
Rated for the heat, cold, humidity and altitude of rooftop and ground-mount installations.
Optional monitoring
An optional smart monitoring module, cooling fan or anti-reverse (blocking) diode can be fitted on request.
MC4 or PG connectors
Choose MC4 for plug-and-play or PG glands for your own cable — both IP-rated and bottom-entry.
Compact wall-mount design
A slim enclosure that mounts on a wall, a rail or a pole close to the strings, keeping DC cable runs short.
Where the 1000PV is used
Wherever a 1000 V photovoltaic array has more than one string, and wherever the DC side needs proper protection and a clear isolation point.
Residential rooftops
Combining household strings into one protected output.
Commercial and industrial roofs
Multi-string arrays gathered before the inverter.
PV + battery storage
A protected DC collection point on hybrid systems.
Before the inverter
Short, protected DC runs between the array and the inverter.
Residential rooftop PV
Combining the strings of a household array into one protected output to a single-MPPT inverter.
Commercial and industrial roofs
Multi-string arrays on larger roofs, where several strings are gathered before the inverter.
Utility-scale PV plants
String aggregation and protection for large ground-mount and tracker arrays.
PV plus battery storage
A protected DC collection point on hybrid and storage installations.
Agro-photovoltaic and floating
Combiner boxes for agrivoltaic sheds and floating solar, where the DC side must stay weatherproof.
Retrofit and repowering
Adding string protection and a clear isolation point to an existing array.
Built to recognised requirements
The 1000PV is designed to the international standards for the switchgear, surge protection and fuses it contains, and is CE and RoHS certified.
IEC 60947-2
The DC breaker and isolation switch follow the circuit-breaker standard.
IEC 61643-31
The DC surge protector is a Type II SPD for photovoltaic installations.
IEC 60269-6
The string fuses are gPV DC fuses rated for photovoltaic circuits.
CE · TUV · CB
CE, TUV and CB certified, with UKCA and RoHS compliance and IP65 protection to IEC 60529.
The box is also designed and configured with reference to the photovoltaic junction-equipment specification CGC/GF 037:2014.
Frequently asked questions
What is a PV combiner box?
A PV combiner box gathers several photovoltaic strings into one or two protected DC outputs. It combines the string currents and provides string fuses, surge protection and a manual isolation point, so fewer and larger cables run to the inverter. It is also called a DC combiner box, string combiner box or solar junction box.
Where is it installed?
On the DC side, between the solar panels and the inverter, mounted close to the array. Because the enclosure is sealed to IP65 it can be installed outdoors, on a wall, rail or pole.
How many strings can it combine?
The 1000 V series covers 1 to 4 strings, in single-output, dual-output and triple-output versions. See the model table for the exact input/output combinations.
What is the difference between the .1 and .2 models?
The number after the dot is the number of outputs. A .1 model feeds a single-MPPT inverter with one output; a .2 model feeds a dual-MPPT inverter with two outputs, each protected separately.
What protection is built in?
Each string has its own DC fuse, the DC bus has a Type II surge protector (20 kA / 40 kA), and the output passes through a DC isolation switch or DC circuit breaker.
What current ratings are available?
String fuses from 10 A to 30 A in steps, and output breakers from 16 A to 125 A, so the box can be matched to the string current and the inverter input.
What connectors and wiring options are there?
MC4 connectors for plug-and-play, PG cable glands for your own cable, or DIN-rail terminals for free wiring on site. All are bottom-entry and IP rated.
Is it suitable for outdoor installation?
Yes. The enclosure is PC + ABS, IP65 and IK10, flame-retardant to V-0, and rated from −25 to +60 °C with up to 95 % humidity.
Which standards and certifications apply?
The design follows IEC 60947-2, IEC 61643-31, IEC 60269-6 and IEC 60529 (with reference to the photovoltaic junction-equipment specification CGC/GF 037:2014), and the product is CE, TUV, CB, UKCA and RoHS certified.
What is the warranty?
The standard warranty is 18 months. Custom configurations, OEM branding and extended warranties can be discussed with our team.
Do you also make metal-enclosure combiner boxes?
Yes. Besides the engineered-plastic enclosures shown here, we also build PV combiner boxes in cold-rolled steel metal enclosures with a UV-resistant powder coating — the same electrical design, for larger arrays, higher string counts and higher currents, with IP65 / IK10 protection. Metal-enclosure versions are quoted to order.
Need a combiner box for your array?
Tell us the system voltage, the number of strings, the string current and the inverter inputs — our team will confirm the right 1000PV model and can supply samples, OEM branding or bespoke configurations.
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