AC Combiner Box Manufacturer in Vadodara, India

An AC combiner box collects the AC output of several string inverters into one or few protected outgoing feeders. In a multi-inverter plant, running every inverter's output cable separately to the main ACDB multiplies cable runs, terminations and protection devices. The combiner box aggregates them close to the inverters — one MCB or MCCB per inverter input, a common busbar, an AC surge protection device and a protected outgoing feeder — so the run to the ACDB is one cable instead of ten.

Wisdom Techno Solutions builds AC combiner boxes at our Vadodara works in laser-cut, powder-coated CRCA steel enclosures, IP54 for indoor and IP65 for outdoor mounting, with switchgear conforming to IEC 60947 and IS 8623 and enclosure ingress protection per IEC 60529. Configurations typically run from 2 to 16 inverter inputs, single-phase or three-phase, at system voltages up to 690 V AC with an 800 V AC class available for modern high-voltage inverter fleets.

• MCB or MCCB per inverter input, rated to the inverter's output current
• Copper or aluminium busbar sized for the combined current with thermal margin
• AC surge protection device (Type II) protecting the collected feeder
• Outgoing MCCB or switch-disconnector for safe isolation of the whole group
• Ferruled, labelled wiring to the approved drawing — maintenance without guesswork
• Provisions for inverter-wise energy metering where the project requires it

The table below is the standard build. Input count, breaker ratings, busbar size and SPD class are set from the inverter schedule and the plant single line diagram.

They are different boards doing different jobs, and in a small plant with one or two inverters the combiner stage is simply not needed — the inverters land directly in the ACDB. The combiner earns its place when the inverter count grows and cable runs to a single distribution point become the cost driver.

Needed: multi-inverter rooftops and ground mounts where several string inverters sit far from the ACDB; C&I plants where roof blocks each carry a group of inverters; plants standardising on repeated inverter blocks. Not needed: single-inverter systems, or layouts where the inverters already sit next to the ACDB. If you are unsure, send the layout — the answer falls out of the cable schedule arithmetic, and we will tell you honestly if a combiner stage adds nothing.

The inverter schedule (model, count, output current, single or three phase), the grouping — how many inverters per combiner, the outgoing feeder arrangement to the ACDB, indoor or outdoor mounting with IP rating, and any metering or monitoring requirement per inverter. With these five inputs the box is engineered without assumptions.

• Input breakers copied from the inverter frame size, not its actual maximum output current — nuisance trips in summer or under-protection follow
• SPD omitted because "the ACDB has one" — the combiner sits closest to the roof and sees the surge first
• Busbar sized as the simple sum of breaker ratings with no thermal margin for a closed outdoor enclosure in Indian summer
• IP54 specified for an open-roof mount — outdoor combiners need IP65 and a canopy
• No isolation on the outgoing feeder — maintenance on the run to the ACDB then requires shutting every inverter individually

An AC combiner box is an LT assembly, and it is built like one: busbar sizing with thermal margin, clearances and creepage per LT practice, IEC 61439-1 assembly discipline, and routine tests and inspection before dispatch — insulation resistance, wiring verification against the approved drawing, torque checks and functional operation. GA and SLD drawings are submitted for approval before manufacturing, and the test report ships with the box. The same works builds the ACDB, DCDB and AJBs, so the whole solar board package arrives matched.

• BESS Electrical Panel Design — PCS, ACDB & DCDB — the same collection logic in battery-coupled plants
• Load List & Incomer Sizing Guide — how combined currents size the upstream boards
• FAT & Routine Test Checklist — what is checked before any board leaves the works
• LT Panel Specification & RFQ Guide — how to specify a board so quotes are comparable

If this is not the right fit for your layout, these are the related products we build to the same standard:

• Solar ACDB & DCDB — the AC and DC distribution pair the combiner feeds into
• AC Distribution Board — the downstream board the combiner's feeder lands in
• Array Junction Box (AJB) — the DC-side collection box on the structure
• 800V LT Panel — for 800 V AC class high-voltage inverter systems
• Solar BOS Electrical Package — the complete solar board package from one works

Email your single line diagram, load list and system fault level and our engineers will come back with a technical offer. Not sure what to send? See what a panel manufacturer needs in order to quote accurately.

Page updated: 17 September 2026