Loyang Avenue Solar Installation: 13 kWp on a Low-Pitch Metal Roof, $4,033 a Year

21 black monocrystalline panels rail-mounted to a grey corrugated metal roof, completed in a single day with no structural work. Here's what this 13 kWp installation in the Loyang estate near Pasir Ris actually involved, and what it saves.

What was actually installed at this home?

21 black monocrystalline panels totalling 13 kWp, rail-mounted to the existing corrugated metal roof profile. The roof's low-pitch design meant panels could be laid out across a wide, largely unobstructed area without the layout compromises a steeper or more fragmented roof shape often forces.

Why does the low pitch actually matter here?

A shallower roof slope maximised usable roof area for this specific property, letting the full 21-panel array sit at a consistent, unbroken orientation rather than being split across multiple smaller sections. Singapore's near-equatorial sun path also means a low-pitch roof isn't the generation penalty it would be at a higher latitude, where a shallow angle misses more of a low winter sun.

See how roof orientation and pitch actually affect generation for the fuller mechanics behind this.

How was the system mounted, and why no structural work?

Rail-mounted directly to the existing corrugated profile, a standard approach for metal roofing in sound condition. Corrugated metal roofs generally accept this kind of mount without added reinforcement, since the material and existing structure underneath were already confirmed capable of carrying the system's weight before installation began.

This kept the project to a single day on site, with no waiting on structural assessment results or remedial work before mounting could start.

Does a low-pitch roof actually drain properly with panels installed?

A low-pitch roof relies more on its surface finish and gutter design than a steep roof does to shed Singapore's frequent, heavy rainfall, so panel placement has to work with the roof's existing drainage pattern rather than diverting flow toward a point the roof wasn't designed to handle. A rail-mounted system following the existing profile, as used here, avoids creating a new dam or pooling point.

This is a real installation-planning detail worth an installer raising proactively during the site survey, not one to discover only after the first heavy storm following installation.

How much does this system actually save?

Around $336 a month, roughly $4,033 a year, based on Sunnify's projection for this 13 kWp system at the Q3 2026 EMA regulated tariff of S$0.3478/kWh, 25% self-consumption, and an SCT export credit of S$0.2581/kWh. This sits a step above a standard 12 kWp system's savings, tracking the modestly larger array size.

How does this compare to a similarly fast installation elsewhere?

Like the ballasted flat-roof system at Lim Ah Pin Road, this installation's speed came from a roof type that needed no structural remediation or complex sectioning before mounting could begin. Different roof types, metal versus flat concrete, reached the same practical outcome for a different underlying reason.

What would a similar metal roof need to consider?

Confirm the existing roof structure's condition before assuming a fast, structural-work-free installation transfers directly, since an older or already-compromised metal roof may need remedial work first. See waterproofing and structural considerations for a solar installation for what an installer should actually be checking.

Run the full roof suitability checklist to assess your own roof, and the Sunnify solar estimate to see what a similar system could save on your property.