Residential Solar FAQ

Landed residential properties in Singapore (such as Bungalows, Semi-Detached, Terraces, and Corner Terraces) with structural roof ownership are generally suitable for rooftop solar. Factors evaluated during our site assessment include roof material, orientation (south and north facing are ideal), pitch angle, structural condition, and shading from surrounding trees or neighboring structures.

Modern high-efficiency solar panels require approximately 2.0 to 2.2 square metres of unshaded roof space per panel. A standard 10 kWp residential array (approx. 18 to 20 panels) typically occupies around 36 to 44 square metres of clear roof surface.

Physical roof mounting structure installation, panel fitting, and electrical wiring typically take 3 to 4 days on site.

Physical roof and electrical installation typically takes 3 to 4 days on site. The full process—including SP Group grid connection approval and LEW submission—takes approximately 4 to 6 weeks from project execution.

Excess solar power generated during the day that is not immediately consumed by your household appliances flows back into the national power grid. Under SP Group payment schemes (e.g. Simplified Credit Treatment for contestable/non-contestable consumers), exported solar energy earns utility bill credits that offset your evening grid power purchases.

Yes. Solar panels generate power from ambient solar irradiance, not just direct sunlight. While peak output occurs during clear, sunny afternoons, modern N-Type monocrystalline panels continue generating electricity at reduced capacity during overcast or rainy Singapore weather.

For safety reasons, standard grid-tied solar inverters automatically shut down during a public power grid outage (islanding protection). This prevents hazardous back-feeding of electricity into grid power lines while technicians perform repairs.

Solar arrays feature zero moving parts and require minimal maintenance. In Singapore, tropical rain showers naturally rinse off light atmospheric dust. We recommend an annual visual inspection and routine performance review via your mobile monitoring application.

Actual electricity bill savings depend on several key factors: available unshaded roof space, roof orientation, household daytime electricity consumption habits, total installed system size, prevailing electricity tariffs, and applicable grid export credit rates.

No. Our installation teams utilize specialized, engineered mounting brackets tailored to your roof type (e.g. tile anchor brackets for tiled roofs, standing seam clamps for metal roofs) using waterproof sealing techniques to ensure your roof remains fully weather-tight.

Interconnection with the national grid requires formal electrical single-line diagram endorsement by a Licensed Electrical Worker (LEW) and grid connection clearance from SP PowerGrid. Vonx Solar manages all technical applications and administrative submissions on your behalf.

While daytime solar generation can significantly lower or even offset your daytime energy usage, night-time electricity consumption is supplied from the grid. Export credits generated during daytime help offset grid charges, but fixed utility service fees or evening consumption may remain.

You can request a no-obligation solar assessment by filling out our online Enquiry Form or contacting us via WhatsApp (+65 9187 9573). Our engineering team will evaluate your property address and roof profile to prepare a customized feasibility report.