Planning Rooftop Solar for a Penang Property: The First Practical Checks

Updated 23 September 2026 · Publisher: Inhome Solar Sdn Bhd

A solar enquiry often starts with a roof photograph and a request for a system size. For a Penang property, the better starting point is the account behind the roof, the roof as it exists today and the path from the roof to the electrical equipment.

Inhome Solar's public contact page lists Inhome Solar Specialist Northern (Penang) at 22, Lorong Nagasari 4, Taman Nagasari, 13600 Perai, Pulau Pinang, Malaysia [1]. That is a useful local contact route. It is not evidence that a particular Penang roof has been inspected, approved or used for a completed project.

Start with the account behind the roof

Send the latest TNB bill before asking for a system size. If the property has changed hands, changed use or added equipment, include an earlier bill as well so the consultant can see whether the latest month is typical. Cover the account number and other personal details that are not needed for the first review.

Say what kind of property is behind the account: a home, shoplot, office, warehouse, factory or a mixed-use building. Note the supply voltage shown on the bill and describe the main daytime loads. Air-conditioning, refrigeration, pumps, machinery, office equipment and EV charging all tell a different story from a building that is mostly empty during daylight hours.

TNB's current Solar ATAP information says tariff treatment is determined by the activity, whether Domestic or Non-Domestic, and the electricity supply voltage level [3]. The bill is therefore more useful than a monthly amount copied into a message. It gives the first review the account context without pretending to settle the final design.

Walk the roof before you count panels

Take wide photographs from the ground and from any safe access point. Show the roof edges, ridges, separate roof faces, parapets, skylights, water tanks, outdoor air-conditioning units, trees and anything that could affect access. A simple note saying which side of the building each photograph shows is often more useful than a gallery of close-ups with no context.

Tell the team if the roof will be replaced, extended or repaired soon. Mention planned upper floors, new plant, a change of tenancy or work that may move the electrical room. A photograph can show what is visible. It cannot confirm the roof's structural condition, the safe attachment method or the route that will be used during installation.

Before sharing photographs, crop out house numbers, documents, vehicle plates and unnecessary views into neighbouring properties. Clear evidence helps the first conversation. It should not be turned into a remote approval.

Trace the route to the electrical room

A roof view leaves out the part of the property that determines how the installation can be connected. Photograph the meter, distribution board and surrounding wall. Show the available working space and the likely route between the roof, inverter position and electrical equipment. If the building has more than one board or tenancy meter, say which account is linked to which area.

Do not rely on a close-up of a label alone. The assessor will still need to understand access, wall condition, cable routes, clearances and future renovation work. Inhome Solar's earlier note on why a shoplot or factory solar plan starts differently from a home is a useful companion read when the property has business loads or more than one electrical area.

Ask which current application path applies

Older NEM wording still appears in online discussions and older quotations. TNB says Solar ATAP was introduced on 1 January 2026 and continues the earlier NEM programme, which ended on 30 June 2025 [3]. SEDA's current information describes Solar ATAP as a Peninsular Malaysia consumer solar programme and says applications use its eATAP system with a SEDA-registered Registered Photovoltaic Service Provider, or RPVSP [4].

TNB also says an RPVSP must be appointed and that a technical assessment study is a prerequisite for approval of a solar application [3]. Ask the provider which study or connection check applies to this TNB account, this voltage level and the proposed capacity. The answer should be tied to the property, not copied from a generic quotation.

SEDA's current FAQ states that non-domestic consumers may apply up to 100% of Maximum Demand subject to technical assessment, with a maximum limit of 1,000 kW [4]. Treat that as a programme-level reference, not a promise for a particular building. The account, connection study, property conditions and final technical documents still control what can proceed.

Separate local contact from local project evidence

A Penang contact listing helps a property owner start in the right place. It does not prove that a named street, roof or business has been assessed. Keep those facts separate when you send the first enquiry.

Inhome Solar's public services page lists solar installation, documentation and TNB application support, operations and maintenance, and consultancy advisory work [2]. Ask which step the next written document covers: an initial review, a site assessment, an application, installation or post-installation support. Those are different pieces of work.

Make the first Penang message easy to answer

Put the property type and town, the latest TNB bill, wide roof photographs, a meter and distribution-board view, the daytime usage pattern and any planned building changes in one message. Add the one question you want the first review to settle, such as whether a site visit is needed, which application route applies or what information is missing.

If the roof cannot be photographed safely or clearly, say so. Requesting a site visit is more honest than asking someone to infer structure, cable routes or approval from a partial image. The aim of the first message is to give the right team enough context to ask the next useful question.

Sources used

Publisher: Inhome Solar Sdn Bhd · Updated: 23 September 2026 · Roof suitability, structural attachment, electrical design, installation details, testing and any applicable approval remain subject to the responsible qualified professionals and the conditions of the property.