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AC Combiner Box – reliable AC power combining for demanding PV systems
AC Combiner Boxes combine the power of several string inverters safely and efficiently. They reduce cable runs, create clear feed-in points and ensure a reliable, standard-compliant AC infrastructure in medium-sized and large PV plants.
Configurable
HIS AC Combiner Boxes are available in several technical variants and can be tailored precisely to each project in terms of number of inputs, switching technology, protective devices and enclosure designs.
Safe
NH switch-disconnector technology or MCCB circuit breakers combine AC power reliably and limit short-circuit, overload and overvoltage risks.
Durable
Robust GRP enclosures, high protection ratings and high-quality industrial components ensure high availability in day-to-day plant operation.
Resolve outages faster with AC Combiner Boxes
HISbox AC combiner boxes combine the power of several string inverters and create a safe and standard-compliant AC infrastructure for commercial & industrial plants as well as utility-scale solar parks. As the AC-side variant of the generator connection box they reduce complex cable runs, enable clear feed-in points and ensure high plant availability – even with large inverter clusters and demanding operating conditions.
Thanks to modular protection and switching technology such as NH switch-disconnector strips or MCCB circuit breakers, the HISbox AC combiners offer a robust safety concept that effectively limits short-circuit, overload and overvoltage risks. High-quality industrial enclosures, tested components and protection ratings up to IP65 ensure durable, reliable operation indoors and outdoors.
As leading industry providers demonstrate, modern AC combiner solutions focus above all on plant availability, installation efficiency and protective functionality. HISbox combines precisely these requirements with a flexible, project-oriented implementation: from safe AC distribution points and optimised installation concepts through to the integration of surge protection and standard-compliant grid and plant protection technology.
This results in a resilient AC infrastructure that makes PV projects economical, safe and future-proof.
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Maximum performance and protection for large PV plants: For large PV plants and demanding industrial installations, HIS offers AC combiner boxes for up to 1000 V AC. MCCB circuit breakers are used here, enabling precise protection and switching functions at high currents and with large inverter clusters.
Typical applications:
Utility-scale solar parks
Plants with large inverter blocks
PV systems with increased grid requirements and high currents
Technical features:
Up to 1000 V AC rated voltage
MCCB circuit breakers (up to 160 A per input)
2 to 4 AC inputs
High short-circuit strength
Optional type 1+2 surge protection
UV- and ozone-resistant GRP enclosures with IP65
Expandable AC system components
For a complete, consistently safe AC infrastructure. HISbox AC combiner boxes can be sensibly combined with further AC system components to build a consistently safe, standard-compliant and clearly structured AC infrastructure. These building blocks extend the plant functionally and support planning, operation and grid compliance – especially in commercial & industrial as well as utility-scale projects.
Grid and plant protection units handle the safety monitoring of the grid interface. They continuously check relevant grid parameters and ensure a defined, standard-compliant disconnection in the event of a fault. They thus form the central protective authority between the PV plant and the public grid and ensure a stable feed-in point.
Core functions:
Monitoring of voltage, frequency and other grid parameters
Automatic disconnection in accordance with VDE-AR-N 4105 / 4110
Remotely controllable 4-pole isolating point
Storage and evaluation of grid events
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Safety of AC Combiner Boxes
On the AC side of photovoltaic plants, protection and switching technology take centre stage. The HISbox AC combiner boxes use robust industrial components such as NH switch-disconnector strips or MCCB circuit breakers to combine AC power reliably and limit electrical risks. Through clearly defined protective functions, both the inverter side and the higher-level AC distribution are effectively safeguarded.
Monitoring and AC Combiner Boxes
While the DC area often uses string monitoring, monitoring on the AC side focuses above all on system states and grid parameters. HISbox AC combiners can be integrated effortlessly into SCADA systems, monitoring platforms or grid protection solutions and supply the necessary information there for stable operational management.
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