Berwick Drive Solar Installation: 26.4 kWp Across 54 Panels, $8,190 a Year

54 panels spanning two sections of a large flat roof, currently Sunnify's largest documented residential system. Here's what a 26.4 kWp installation actually involves at this Berwick Drive home near Hougang, and what it saves.

What was actually installed at this home?

54 panels totalling 26.4 kWp, split across two distinct sections of a large flat roof near Hougang. This is roughly double the panel count of a standard 12-13 kWp terrace installation, reflecting a substantially larger available roof area than a typical landed home has to work with.

Why split the array across two roof sections?

54 panels exceeds what most single roof sections on a detached home can hold at a consistently good orientation. Dividing the array across two sections let this installation reach its full scale without compromising on orientation or forcing panels into a shaded or awkwardly angled portion of the roof.

See how available roof area actually constrains system size for why this is the real ceiling on scale, not budget alone.

Does a system this large need a different electrical design?

Yes, in more than one respect. Correct MPPT channel allocation across the two roof sections matters more here than on a single-face system, since each section needs its own tracking rather than sharing a channel and dragging each other's output down.

A system at this scale is also more likely to approach the limits of a standard single-phase electrical connection, making the single-phase versus three-phase question a genuinely live design consideration here in a way it usually isn't for a smaller terrace system.

Does a system this size take longer to commission?

Generally yes. More panels, more strings, and a two-section layout mean more individual checks during LEW commissioning, wiring, earthing, and anti-islanding testing across a larger array, than a standard-sized system needs. This is a real timeline factor worth budgeting for on a large installation, not a sign anything went wrong.

See what commissioning actually involves for the full testing process any system, large or small, goes through before being switched on.

How much does this system actually save?

Around $683 a month, roughly $8,190 a year, based on Sunnify's projection for this 26.4 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 is more than double a standard 12 kWp terrace system's savings, tracking the array's larger scale.

How does this compare to Sunnify's other large documented system?

At 26.4 kWp, this installation is somewhat larger than the 20.6 kWp, 42-panel system at Mount Sinai, currently the second-largest residential system Sunnify has documented. Both share the same underlying pattern: a large property with substantial multi-section roof area is what makes a system at this scale achievable at all.

What would a similarly large property need to consider?

Confirm your roof's total usable area across every section before assuming a system this size is achievable, and raise electrical capacity, MPPT allocation and single-phase versus three-phase, early in the design conversation rather than after a layout is already set. See solar on a GCB or bungalow-scale roof for how larger properties are typically approached.

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.