Solar AC Combiner Boards

Safe collection, protection and grid synchronization for multi-string commercial solar PV inverters

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Commercial Solar AC Combiner Solutions

Nairobi Power Engineers manufactures solar AC combiner boards, grid-tie synchronization panels, and solar-diesel hybrid controllers for commercial and industrial (C&I) photovoltaic installations. Our panels safely aggregate the AC outputs of multiple string inverters (from 50 kW to 2 MW+) into a single coordinated connection point.

Engineered with heavy-duty Lovato Electric switch disconnectors, MCCBs, Type 1+2 surge arresters, and Class 0.2s multi-function energy meters, EPRA and utility connection requirements are reviewed against the project scope and proposed equipment.

Equipment & Range Highlights

C&I Solar • 400V / 800V AC

Conceptual solar ac combiner boards scene; exact specifications vary.

Multi-Inverter Solar AC Combiner Panel

Custom engineered AC collection panelboards accommodating 2 to 16 inverter inputs with individual MCCB/fuse disconnects and totalizer metering.

InvertersUp to 16 Inputs

Voltage400 V / 800 V AC

SurgeClass I+II SPD Included

Energy meters and power analyzers — engineering concept

Lovato DMG • Bi-Directional

Conceptual energy meters and power analyzers scene; exact specifications vary.

Lovato Bi-Directional Four-Quadrant Energy Meters

Precision revenue-grade power analysers measuring solar generation, import/export kWh, power factor, and harmonic THD with Modbus/SunSpec.

AccuracyClass 0.5s / Class 0.2s

MeasurementsImport / Export 4-Quadrant

ProtocolModbus TCP / SunSpec

AC Combiner Technical Reference

Parameter	Specification Standard
Rated System AC Voltage	400 / 415 V AC • 800 V AC (High-Efficiency String Systems)
Power Aggregation Capacity	50 kW up to 2.5 MW multi-inverter schemes
Surge Protection Level	Lovato Type 1+2 SPD (Iimp 12.5 kA / Imax 50 kA per pole)
Isolation Devices	Lovato GL series load-break switch disconnectors (IEC 60947-3)
Grid Compliance Features	Zero export control interface, anti-islanding relay inputs, ROCOF protection
Enclosure Construction	IP55 / IP65 powder-coated steel with UV-resistant seals and forced ventilation

Engineering & Build Highlights

Individual MCCB or disconnector on each inverter input allows isolated servicing without dropping the entire solar farm
Heavy-duty tin-plated copper busbar chambers fault-rated up to 50 kA / 1s
Lovato Type 1+2 surge arresters protect sensitive inverter power electronics against lightning strikes
Bi-directional Class 0.5s energy metering with Modbus RTU / SunSpec protocol for cloud portal telemetry
Built-in interlock with generator ATS panels to prevent reverse solar power feed into diesel generators
Forced ventilation with dust-filtering louvres engineered for high ambient temperature rooftop environments

Target Applications & Sectors

Rooftop solar PV installations for factories & warehousesGround-mounted commercial & institutional solar farmsSolar-diesel hybrid power generation systemsTea & agricultural estate solar power microgridsCommercial shopping mall photovoltaic arraysTelecom tower solar hybrid power cabinets

KPLC regulations currently restrict unmetered reverse power flow into the public grid for non-net-metered systems. We integrate rapid zero-export controllers that throttle inverter output in real-time when solar generation exceeds building load.

Yes. Modern high-power string inverters (100 kW–250 kW) output at 800V AC to minimize cable losses. We engineer 800V-rated busbars, switchgear, and SPDs specifically certified for this voltage.

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