MCC Panels

Renewable Energy

MDB, metering, APFC, ATS, PLC, DC distribution, capacitor banks

Renewable Energy

Renewable energy plants place unusually demanding requirements on low-voltage switchgear and controlgear assemblies because they must operate in outdoor, high-variation, and grid-interactive environments while maintaining safe, compliant, and reliable performance. Solar PV plants typically require DC distribution and string combiner panels, AC collection boards, main distribution boards, metering panels, and plant controller panels. Wind farms add auxiliary distribution, UPS-backed control panels, and protection relay cubicles for turbine and substation interfaces. Battery energy storage systems (BESS) introduce bidirectional power flow, DC protection, isolation, pre-charge, and battery management interfacing, often integrated with PLC-based automation and SCADA gateways. These assemblies are generally designed and verified to IEC 61439-1 and IEC 61439-2 for power switchgear assemblies, with functional extension to IEC 61439-3 for distribution boards where applicable and IEC 61439-6 for busbar trunking interfaces in large plants or collector systems. Devices within the panels commonly conform to IEC 60947, including MCCBs for feeder protection, ACBs for incomers and bus couplers in larger inverter stations, contactors for capacitor bank stages, VFDs or soft starters for pumps and cooling systems, and protection relays for transformer, feeder, and grid-tie supervision. Metering power analyzers are used for energy yield tracking, power quality monitoring, and export/import compliance, while surge protection devices are essential for lightning-prone solar fields and exposed wind sites. In environments with combustible gases or dust, or near battery rooms and certain process zones, enclosures and internal arrangements may also need consideration against IEC 60079. Where arc events are a concern in large inverter or BESS rooms, design verification and mitigation practices may reference IEC 61641. Typical renewable-energy assemblies are engineered with appropriate forms of internal separation, often Form 2, Form 3b, or Form 4 where maintainability and operational segregation are required between incomer, feeder, metering, and auxiliary sections. Short-circuit withstand ratings must be matched to site fault levels, transformer impedance, and inverter contribution, with common assembly ratings ranging from 25 kA to 65 kA or higher depending on plant architecture. Rated currents vary widely, from compact 125 A string combiner and auxiliary boards to 1600 A, 3200 A, or even 4000 A main AC distribution boards and collector panels. Environmental considerations are central to renewable installations. Outdoor panels may require IP54, IP55, or IP65 enclosure protection, anti-condensation heaters, filtered ventilation, stainless steel or powder-coated galvanized construction, and UV-resistant gasketing. Thermal management is critical in inverter stations and battery enclosures because high ambient temperatures reduce component life and can affect protection settings. EMC performance under IEC 61000 is also important because VFDs, inverters, relays, and PLC I/O modules can all introduce or suffer from conducted and radiated disturbances. Proper segregation of DC and AC wiring, shielded cable termination, and bonding/earthing strategy are necessary to ensure stable operation. In practice, these panels support real-world applications such as solar farm feeder summation, grid-code compliant reactive power compensation through APFC capacitor banks and harmonic filtering, automatic transfer between grid and standby sources using ATS systems, plant-wide monitoring through PLC automation panels, and controlled DC distribution for battery storage and auxiliary loads. For EPC contractors, electrical engineers, and facility managers, the key objective is an IEC 61439-verified assembly that safely integrates protection, metering, control, and communication while minimizing downtime and supporting long-term asset performance.

Panel Types for This Industry

Main Distribution Board (MDB)

Main Distribution Board (MDB) assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

Metering & Monitoring Panel

Metering & Monitoring Panel assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

Power Factor Correction Panel (APFC)

Power Factor Correction Panel (APFC) assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

Automatic Transfer Switch (ATS) Panel

Automatic Transfer Switch (ATS) Panel assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

PLC & Automation Control Panel

PLC & Automation Control Panel assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

DC Distribution Panel

DC Distribution Panel assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

Capacitor Bank Panel

Capacitor Bank Panel assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

Custom Engineered Panel

Custom Engineered Panel assemblies engineered for Renewable Energy applications, addressing industry-specific requirements and compliance standards.

Frequently Asked Questions

A solar PV plant usually combines DC string combiner or DC distribution panels, AC collection panels, main distribution boards, metering panels, protection relay panels, and PLC automation panels. The AC side commonly includes MCCBs or ACBs for feeder and incomer protection, while the DC side uses correctly rated isolators, fuses, surge protection devices, and monitoring hardware. For the assembly as a whole, IEC 61439-1 and IEC 61439-2 govern design verification, temperature rise, dielectric performance, and short-circuit withstand. In outdoor PV fields, enclosure protection often targets IP54 to IP65 depending on exposure, and EMC practices under IEC 61000 are important because inverters can introduce harmonics and switching noise. Patrion typically engineers these as custom-built assemblies for inverter stations and plant balance-of-system applications.
Short-circuit rating is determined by calculating the prospective fault current at the installation point, then verifying that the assembly, busbars, protective devices, and connections can withstand and interrupt that level safely. In renewable plants, the fault level is influenced by the transformer size, grid contribution, cable lengths, and in some cases inverter contribution. Under IEC 61439, the assembly must be design-verified for short-circuit withstand and protective coordination, while the component devices must comply with IEC 60947 ratings. Common renewable-energy boards may be specified at 25 kA, 36 kA, 50 kA, or 65 kA, but the final value must be matched to the EPC study and utility interface requirements. For large BESS or inverter rooms, careful coordination with ACBs, MCCBs, and protection relays is essential.
Yes. Renewable plants are frequently exposed to lightning, long cable runs, and switching transients from inverters, VFDs, and capacitor banks, so surge protection devices are usually essential on both AC and DC circuits. EMC compliance is also critical because noise can affect PLC I/O modules, metering analyzers, communication links, and protection relays. IEC 61000 is the key EMC reference for immunity and emission performance, while IEC 61439 governs the mechanical and thermal integrity of the panel assembly. In practice, well-designed renewable panels use coordinated SPD stages, proper earthing, screened cable management, and segregation between power and signal wiring. This is especially important in solar farms, wind farms, and BESS installations where long runs and sensitive automation coexist.
A metering panel is primarily dedicated to measuring electrical quantities such as voltage, current, kW, kWh, kvar, power factor, frequency, and harmonics for generation reporting, grid compliance, and plant performance tracking. It typically contains metering power analyzers, CTs, VTs where required, communication modules, and sometimes revenue-grade devices. A main distribution board, by contrast, is the primary power distribution point that receives incoming supply from inverters, transformers, or the grid and distributes it to feeders, auxiliaries, and sub-panels through MCCBs or ACBs. Both panel types are commonly built to IEC 61439-1/2, but their functional design differs: metering panels emphasize accuracy and data integration, while MDBs emphasize load distribution, fault protection, and maintainability. Many renewable plants use both in combination.
An automatic transfer switch is used when a renewable facility requires seamless or controlled transfer between two power sources, such as grid and generator backup, or between utility supply and a standby auxiliary source. ATS panels are common for critical plant auxiliaries, control buildings, communication rooms, and safety systems where downtime is unacceptable. In some hybrid sites, they also support transfer logic between different supply paths to maintain operation during maintenance or outages. The switching devices inside an ATS are selected and coordinated under IEC 60947, while the panel assembly itself is verified to IEC 61439. For outdoor renewable sites, designers also consider enclosure protection, control voltage reliability, and interlocking to prevent unsafe source paralleling.
Outdoor renewable-energy panels often require IP54, IP55, or IP65 depending on dust exposure, rain, washdown, and site conditions. Solar farms in dusty or coastal regions may need corrosion-resistant enclosures, UV-stable finishes, stainless steel hardware, and anti-condensation heaters. Wind farms and BESS sites may also demand enhanced thermal management because heat buildup can reduce device life and affect protection settings. The enclosure choice must be matched to the environmental profile, not just the mechanical layout. Under IEC 61439, the assembler must also verify temperature rise, clearances, creepage distances, and protection against direct contact. In practice, outdoor renewable panels should be engineered as complete systems, including ventilation, gland plates, bonding, and service access.
Yes, but they must be engineered carefully. APFC and capacitor bank panels are often used in renewable facilities to support power factor correction, reactive power control, and grid code compliance, especially where auxiliary loads or collection networks create reactive demand. However, because inverter-based generation can produce harmonics, capacitor banks must be assessed for detuning reactors, harmonic resonance, and switching transients. The panel may include capacitor contactors, fuses, power factor controllers, and harmonic filters, all coordinated under IEC 60947 and assembled to IEC 61439. In some plants, static VAR compensation or filter systems are preferred over simple capacitor steps. The correct solution depends on the harmonic profile, utility requirements, and plant operating mode.
For a BESS project, EPC contractors should specify clear functional separation between DC battery circuits, PCS/inverter interfaces, auxiliary supplies, safety interlocks, and communication networks. The panel often includes MCCBs or DC-rated switching devices, protection relays, PLC I/O modules, metering analyzers, UPS-backed control power, and surge protection devices. Depending on the site, pre-charge circuits, emergency stop logic, smoke/fire interface points, and battery management system communication may also be required. The assembly should be designed and verified to IEC 61439, with device selection under IEC 60947, EMC precautions under IEC 61000, and, where applicable, considerations aligned with IEC 61641 for arc fault risk mitigation. A good specification will also define IP rating, ventilation, short-circuit withstand, and maintenance access.

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