Best Solar Proposal Software Malaysia: 2026 Guide

A Malaysian solar quote is decided before the design starts. Domestic NEM 3.0 installations are capped at 12 kWp, and non-domestic installations at 75% of Maximum Demand taken from the TNB bill. Above that, nothing is permissible regardless of roof area. The scheme is also quota-based through SEDA in periodic finite rounds, so approval is not automatic, and without it TNB will not fit the bi-directional meter. Then the whole process takes 4 to 6 months from application to first billing. A proposal that ignores any of those three facts is a proposal that will be revised. This guide compares the platforms Malaysian installers should shortlist for quoting.

Short version. The best solar proposal software for Malaysian installers in 2026 is SurgePV, because it enforces the NEM 3.0 capacity ceilings at design time, models GITA for commercial buyers, and generates the customer document from the same engineering record so the quoted system is the permissible one. PVsyst suits large C&I engineering with separate quoting. OpenSolar works for domestic inside the 12 kWp cap.

Malaysia has good irradiance, an unusually favourable 1:1 export offset, and a well-organised regulator. The friction is entirely administrative, which means the proposal is as much a scheduling document as a financial one. For the design-side comparison see our best solar design software Malaysia guide, and the global solar proposal software ranking for the category without the local lens.

Quote The Cap, Not The Roof

The sequence that works is unglamorous and reliable. Take the Maximum Demand from the TNB bill. Multiply by 0.75. That is the ceiling. Check whether roof area supports it. Only then design.

Because NEM 3.0 offsets exports against imports at the same tariff, the payback ratio does not change with system size. A 300 kWp system and a 500 kWp system on the same tariff have the same payback period. There is therefore no economic argument for quoting above the cap and no economic loss in quoting at it. The only thing the oversized design achieves is a rejected application.

That 1:1 equivalence has a second consequence worth explaining to customers who have read about solar elsewhere. In markets with low export rates, installers push batteries and load shifting hard because self-consumption is worth several times export. Under NEM 3.0 that gap does not exist, so the same recommendations carry much less weight. Being straight about this builds credibility, and it steers the conversation toward the things that actually matter here, which are the cap, the quota and the timeline.

Timeline And Quota Belong In The Document

The 4 to 6 month window from SEDA application to first billing is the most under-communicated fact in Malaysian solar sales. Customers routinely assume that installation means generation and export. It does not. Between the two sits quota approval, TNB’s bi-directional meter, and the connection process.

A proposal should state the expected timeline explicitly and identify the quota round it depends on. Where quota availability is uncertain, the honest structure is to show two cases: the export case against confirmed quota, and the self-consumption-only fallback if quota is not secured. The second case is a genuinely different investment, and presenting it as a risk rather than concealing it is what separates a professional quote from an optimistic one.

Regional variation matters here too. Sarawak operates independently under Sarawak Energy Berhad with separate portals and potentially different caps and rates. Sabah and Labuan use SESB’s distinct scheme. A template built on Peninsular Malaysia and TNB will be wrong in East Malaysia, and the customer will not be the one who discovers it first.

GITA And The Commercial Case

GITA gives a 100% investment tax allowance over three years, subject to MIDA approval. On a commercial project that is a substantial accelerator, but it is an allowance against statutory income rather than a cash grant, so its value depends on the customer’s tax position and their ability to absorb it. Modelling it at a generic rate overstates the benefit for a company with limited taxable income and understates it for a profitable one.

The MIDA approval dependency also belongs in the document. An allowance contingent on an approval that has not yet been granted is not the same as one already secured, and a proposal that presents it as certain is making a promise it does not control.

GITE, the 70% income tax exemption over ten years, applies to solar service providers rather than to the end customer, so it should not appear in a customer-facing proposal at all.

The Six Platforms Malaysian Installers Should Evaluate

1. SurgePV, the integrated pick

Capacity ceilings enforced at design time, GITA modelling at the customer’s rate, auto-generated single line diagrams for the mandatory PE stamp, 8,760-hour simulation with a tropical thermal model, and white-label proposals with e-signature from the same project record. $1,299 to $1,899 per user per year.

2. PVsyst

The bankable reference for large C&I and LSS projects where a TNB power purchase agreement or a lender requires it. No proposal layer, no NEM logic. See our PVsyst alternative review.

3. OpenSolar

Free at entry, workable for domestic work inside the 12 kWp cap. Manual scheme handling and simplified shading. Our OpenSolar alternative breakdown covers the limits.

4. HelioScope

Solid browser-based engineering for C&I rooftops with no proposal layer. Our HelioScope alternative guide covers the trade-offs.

5. Aurora Solar

Residential design built for US net metering, with no MD-based capping and no NEM logic. Difficult to justify. See our Aurora Solar alternative comparison.

6. Excel plus AutoCAD

Common on Malaysian commercial work because of the PE stamp requirement. Produces drawings and no simulation, and the usual source of designs that exceed the MD ceiling.

Malaysia Solar Proposal Software Comparison

Worked Example: 300 kWp Factory, With And Without Quota

An illustrative calculation, not a specific customer project. Inputs: 400 kW Maximum Demand giving a 300 kWp ceiling, 1,450 kWh per kWp specific yield, 435,000 kWh generation, 65% consumed on site during production hours, tariff RM 0.50 per kWh, installed cost RM 660,000.

Failing to secure quota costs RM 76,125 a year and pushes payback out by more than a year and a half. The project still works, which is the useful point: a factory with strong daytime load has a defensible case even without export. A warehouse with low daytime consumption does not, and for that customer the quota is the whole investment case. Showing both columns tells the customer which of those they are.

Who Should Choose What

• Choose SurgePV if you want caps enforced, GITA modelled at the customer’s rate, and proposals generated from the design record.
• Choose PVsyst where a TNB PPA, LSS tender or lender names it, paired with separate quoting.
• Choose OpenSolar for domestic work inside the 12 kWp cap where entry cost decides.
• Choose HelioScope if your team is engineering-only on C&I rooftops.
• Avoid Aurora here. No scheme logic, no MD capping, wrong price point.

After signing, pipeline and follow-up sit in a CRM. QuickEstimate takes the handoff from SurgePV by API.

The Bottom Line

Malaysian quoting is an administrative discipline wrapped around genuinely good economics. The 1:1 offset is generous. The caps, the quota and the timeline are what decide whether the customer gets it.

• Compute 75% of Maximum Demand before designing. Roof area is irrelevant above that ceiling, and quoting above it costs a quota round.
• State the 4 to 6 month timeline and the quota dependency. Customers assume installation means generation, and correcting that after signing is the worst time to do it.