SigenMicro AC Trunk Cable 40P 1.1m 4.0mm2 - Rooftop Bus Cable

Description

The SigenMicro AC Trunk-40P-1.1M-4.0 (MPN 14280066) is the pre-terminated AC bus cable used to link a string of SigenMicro microinverters, built around a tight 1.1m cable allowance per inverter position to suit closely spaced installations. As with the standard trunk cable, every joint is factory-fitted rather than crimped or soldered on site — the cable is simply run along the array and cut to length where required.

This variant allocates 1.1 metres of 4.0mm² cable per connection, matching one microinverter to one factory-terminated joint across 40 connections, and is built for portrait-oriented PV modules where microinverters sit closer together along each row. The heavier 4.0mm² conductor per metre is specified for longer strings or higher connection counts where voltage drop would otherwise become a limiting factor.

1.1 m

Cable per Connection

4.0 mm²

Conductor Size / m

40

Inverters Served

1.1 m

Interval per Inverter

44 m

Total Reel Length

Portrait

PV Module Orientation

Please Note

The 4.0mm² conductor is intended for longer or higher-current AC bus runs, where the thicker per-metre cross-section helps limit voltage drop across the string. For shorter runs or smaller arrays, the 2.5mm² SigenMicro AC Trunk-40P-1.1M-2.5 may be more cost-effective — check your installation's cable run length and number of parallel microinverters before choosing between the two.

Factory-Terminated Per Inverter

Each of the 40 inverter positions gets a fixed 1.1m allowance of pre-fitted cable, removing the need for on-site crimping or soldering.

Cut As Needed

The 44m reel can be cut to length on installation, so a single trunk covers rows of varying size without waste stock of multiple fixed lengths.

Heavier Gauge for Longer Runs

The 4.0mm² conductor is sized per metre for longer AC bus runs and larger microinverter strings, helping keep voltage drop within limits on bigger UK rooftop installations.

Matched to Portrait Layouts

The 1.1m allowance per connection is designed around portrait PV module widths, keeping each inverter position aligned to a factory-terminated joint along tighter row spacing.

Weatherproof Locking Connectors

Uses the SigenMicro locking connector system, compatible with the dedicated AC Trunk Unlock Tool and AC Trunk Port Cap for a fully weatherproof rooftop run.

Extendable with Couplers

Additional length beyond the standard reel can be added using the SigenMicro AC Trunk Coupler, joining trunk cable to further trunk cable or field-supplied AC cable.

Important Safety Information

AC trunk cable installation and grid connection must be carried out by a qualified electrical installer in accordance with local wiring regulations. The distribution panel's AC switch rating and the number of microinverters connected in parallel should be checked against the manufacturer's technical parameters before selecting cable gauge.

Cable

Product Code

SigenMicro AC Trunk-40P-1.1M-4.0

MPN

14280066

Cable Allowance per Connection

1.1 m per inverter position

Conductor Cross-Section

4.0 mm² per metre

Inverters Served

40

Total Reel Length

44 m (supplied as one length)

Recommended Layout

Portrait PV modules

Compatibility

Used With

SigenMicro 400 / 500 / 800 / 1000W microinverters

Compatible Accessories

SigenMicro AC Trunk Coupler, AC Trunk Port Cap, AC Trunk Terminator, AC Trunk Unlock Tool

Installation

Typical Use

Rooftop solar, multi-microinverter strings, larger UK arrays

On-Site Work Required

Cut to length and plug in — no crimping or soldering needed

Frequently Asked Questions

Is this cable sold by the metre or per inverter?

No — it is supplied as one complete 44m reel with 40 connections already fitted, at a fixed 1.1 metres of cable per inverter position. You are not buying loose metres; you are buying the pre-terminated allowance for a 40-inverter portrait string, which you then cut to the exact run length.

What does "1.1m per connection" mean on this cable?

It means each factory-fitted connection carries a 1.1 metre allowance of cable along the trunk, matching the tighter spacing of portrait-oriented PV modules so each microinverter has a ready-made connection point without any on-site crimping or soldering.

What is the difference between the 2.5mm² and 4.0mm² versions of this trunk cable?

Both use the same 1.1m connector interval and 40-connection count for portrait layouts, but the 4.0mm² version has a thicker conductor per metre, better suited to longer AC bus runs or larger strings where voltage drop needs to be kept lower.

When should I choose the 4.0mm² trunk cable over the 2.5mm² version?

Choose the 4.0mm² version for longer cable runs or where a large number of microinverters are connected in parallel on the same AC bus, since the heavier per-metre gauge helps limit voltage drop over distance.

Can this trunk cable be cut to a shorter length?

Yes. The cable is described by the manufacturer as "cut as needed", so installers can trim the 44m trunk down to match the exact roof run required.

What do I do with unused connections at the end of a run?

Fit a SigenMicro AC Trunk Port Cap over any unused connection, or a SigenMicro AC Trunk Terminator at the physical end of the cable run, to keep the connection weatherproof.

Which microinverters is this cable compatible with?

It is designed for the SigenMicro 400, 500, 800 and 1000W microinverter range.

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