Solar panel installation cost in Penang for 2026

A 3kWp rooftop solar system for a Penang terrace house costs RM 12,000-18,000 fully installed, a 5kWp system runs RM 18,000-28,000, and a 10kWp commercial system lands between RM 38,000 and RM 58,000. At current TNB electricity tariffs and with Net Energy Metering (NEM), the typical residential payback period is 6-9 years.

How residential solar pricing breaks down

A complete grid-tied residential solar system has three components:

1. Solar panels: monocrystalline is now the standard; a 400-450W panel costs RM 800-1,500 supply-only
2. Inverter: converts DC from panels to AC for the home; string inverter costs RM 2,000-5,000 for residential scale; micro-inverters cost more but give per-panel monitoring
3. Mounting, cabling, and installation: roof penetrations, rail system, DC/AC wiring, and switchboard work

Approved contractors handle the TNB NEM application and SEDA Malaysia submission, which is mandatory before any solar export to the grid.

System sizes and installed costs

Residential (terrace and semi-D)

System size	Est. monthly generation	Est. monthly savings	Installed cost
2kWp	220-260 kWh	RM 80-110	RM 8,000-12,000
3kWp	330-390 kWh	RM 120-165	RM 12,000-18,000
5kWp	550-650 kWh	RM 200-275	RM 18,000-28,000
8kWp	880-1,040 kWh	RM 320-440	RM 28,000-40,000

Monthly generation estimates assume Penang's average peak sun hours of 4.5-5.0 hours/day and 15% system losses. Savings are calculated at the Domestic Tariff Block 3-4 rate (RM 0.33-0.45/kWh) under NEM 3.0 offset rules.

Commercial and industrial

System size	Suitable for	Installed cost
10kWp	Shophouse, SME office	RM 38,000-58,000
20kWp	Light factory, warehouse	RM 70,000-100,000
50kWp	Large factory, mall tenant	RM 160,000-240,000

Commercial installations are eligible for capital allowance under the Income Tax Act and green investment tax allowance (GITA) of 100% on qualifying capital expenditure.

NEM 3.0: how the billing works

Under NEM 3.0 (in force since 2023), surplus solar energy exported to the TNB grid is offset against your consumption at a 1:1 ratio (one exported kWh cancels one imported kWh). Any remaining export beyond your bill goes into rollover credit for 24 months. NEM does not pay cash for excess generation.

Example for a 3kWp terrace house in Penang:

• Monthly solar generation: 350 kWh
• Monthly consumption: 420 kWh
• Net import from TNB: 70 kWh
• Bill reduction: roughly 83% of previous electricity cost

What drives variance

1. Roof type and condition: Flat concrete roofs require ballast mounting frames (more material); pitched clay-tile or metal-sheet roofs use rail-and-hook systems. Damaged roof tiles or rust on existing metal sheets add RM 500-2,500 for pre-installation repair.

2. Panel brand and efficiency: Tier 1 panels (LONGi, JA Solar, Jinko, Canadian Solar) carry 12-year product warranties and 25-year power-output warranties. Budget panels are cheaper upfront but degrade faster and may lose manufacturer support. For a 6-9 year payback to hold, the panels need to perform for 20+ years.

3. Inverter type: String inverters (one central unit) are standard and cost-effective when roof panels all face the same direction and shading is minimal. Micro-inverters (one per panel) handle partial shading better and allow panel-level monitoring, but add 20-35% to inverter cost. Hybrid inverters include a battery port for future battery-storage add-on, adding RM 2,000-5,000 over a standard inverter.

4. Application fees and waiting time: TNB NEM application is processed by the contractor. The fee itself is fixed by TNB (RM 200-500 depending on system size). Processing time is currently 4-12 weeks; some contractors factor this into their timeline, others do not.

Payback calculation

System size	Installed cost	Annual savings	Simple payback
3kWp	RM 15,000	RM 1,500-1,800	8-10 years
5kWp	RM 23,000	RM 2,400-3,000	8-10 years
10kWp	RM 48,000	RM 5,000-7,000	7-10 years

Solar prices have fallen around 30% in Penang between 2020 and 2025, and panel efficiency has improved, making 2026 a better time to install than 2022 for the same budget. The Green Technology Financing Scheme (GTFS) offers subsidised interest rates on solar loans through participating banks.

How to compare quotes

• Check if the quote is turnkey: confirm that NEM application, TNB inspection, switchboard upgrade (if needed), and commissioning are included. Some contractors quote supply-and-fix only and bill the regulatory work separately.
• Verify panel and inverter brands and model numbers: ask for the exact datasheet. Tier 1 panels have an independently verified performance record; anonymous brands do not.
• Ask about after-sales: confirm who handles inverter faults and panel cleaning in years 1-5. Installers who subcontract installation and then disappear leave you without recourse.
• Get at least two proposals: solar proposals vary significantly in system design (panel layout, inverter choice) and not just in price. A reputable contractor will walk you through a shading analysis.

Find approved solar panel installers: /solar-panel-in-george-town, /solar-panel-in-bayan-lepas, or /solar-panel-in-butterworth.

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Drafted with AI assistance and editorially reviewed by Wei Han. Prices are Penang market estimates based on contractor and industry data as of 2026 and should be used as a planning guide, not a fixed quote.