Best Solar Proposal Software Singapore: 2026 Guide

Singapore proposals get judged on two numbers that most quoting tools handle badly. The first is ECIS revenue, which depends on the variable USEP wholesale rate and therefore on when the array exports rather than how much it exports in total. Averaging a variable price against a correlated generation curve produces a figure that is right only by accident. The second is the AC rating against the 1 MWac EMA licensing threshold, where crossing the line adds an estimated three to six months of processing that most customers do not know about until it is quoted. This guide compares the platforms Singapore installers should shortlist for quoting.

Short version. The best solar proposal software for Singapore installers in 2026 is SurgePV, because ECIS revenue requires an hourly generation profile matched against a price curve, and SurgePV produces the customer document from the same 8,760-hour engineering record while making the AC rating explicit against the 1 MWac threshold. PVsyst is the bankable reference on larger work but has no proposal layer.

Singapore demand is overwhelmingly commercial, industrial and institutional, and increasingly driven by corporate reporting obligations rather than payback alone. That changes what the proposal has to contain. For the design-side comparison see our best solar design software Singapore guide, and the global solar proposal software ranking for the category without the local lens.

Present ECIS As A Range, Not A Number

The honest structure shows SCT as a single number, because it is one, and ECIS as a range with the assumptions visible. The range should come from running the hourly generation profile against a USEP price profile rather than multiplying annual kWh by an average, because the two series are correlated: solar exports most at midday, and midday pricing is not representative of the daily mean.

A useful framing for the customer is that SCT trades upside for certainty. At roughly S$0.20 per kWh it sits above the low end of the typical USEP range, so it is not obviously the weaker commercial choice. ECIS makes sense where the customer has the administrative capacity for EMC Market Participant registration and a view on wholesale prices.

There is a simplifying fact worth leading with in most commercial proposals: self-consumption dominates. With commercial import prices well above both the SCT rate and the typical USEP range, avoided import usually accounts for the large majority of total value. The scheme choice therefore affects a minority of the return, and telling the customer that plainly saves everyone a long conversation about a secondary variable. SurgePV’s SCT guide and ECIS guide cover the registration mechanics.

The 1 MWac Threshold Is A Scheduling Line

Below 1 MWac, no EMA Generation Licence. At or above it, a full licence through the ELISE portal at elise.ema.gov.sg, estimated at three to six months. On a large industrial rooftop that boundary is often within design discretion, and a proposal that reports only DC capacity hides the decision entirely.

The practical recommendation is to state the AC rating prominently and, where the design sits close to the line, present both options: the sub-threshold system that can proceed quickly, and the larger system with the licensing timeline attached. Customers with a fixed commissioning target will usually take the first. Customers optimising lifetime value may take the second. Either way it should be their choice rather than an accident of how the tool reported capacity. See SurgePV’s EMA licensing guide.

A Licensed Electrical Worker must submit the Electrical Installation application at every size, so that cost belongs in every quote regardless of whether licensing applies.

Reporting Value Belongs In Commercial Proposals

Much of Singapore’s solar demand comes from listed companies, multinationals and institutions with group-level sustainability reporting obligations. For those buyers, quantified avoided emissions sit alongside payback rather than beneath it, and a proposal that reports only a financial return is answering half the question.

JTC also imposes mandatory deployment obligations on certain industrial premises, covered in SurgePV’s JTC solar guide. Where those apply, the buying rationale changes completely: the customer is not evaluating whether to install, but how to install efficiently. A payback-led proposal misreads that situation, and a proposal that leads with compliance and cost-efficiency reads it correctly.

The Six Platforms Singapore Installers Should Evaluate

1. SurgePV, the integrated pick

8,760-hour hourly profiles for credible ECIS modelling, AC rating surfaced against the 1 MWac threshold, satellite 3D with inter-building shading for constrained urban roofs, and white-label proposals with e-signature generated from the same design record. $1,299 to $1,899 per user per year.

2. PVsyst

Bankable simulation for larger projects and anything approaching the licensing threshold where a corporate buyer or lender wants a named report. No proposal layer, no scheme logic. See our PVsyst alternative review.

3. HelioScope

Strong browser-based engineering for the C&I rooftops that dominate demand here, at $1,188 to $3,600 or more per user per year. No proposal layer. Our HelioScope alternative guide covers the trade-offs.

4. Aurora Solar

Residential-oriented design built around US net metering, in a market that is mostly commercial and has no equivalent scheme. Poor fit. See our Aurora Solar alternative comparison.

5. Enact Solar

Reasonable financing presentation with no Singapore scheme or licensing logic. See our Enact Solar alternative review.

6. Consultant spreadsheets plus PVsyst

Standard on institutional and JTC-driven work. Defensible engineering, and the usual source of ECIS being averaged rather than modelled.

Singapore Solar Proposal Software Comparison

Worked Example: 1.15 MWp Industrial Roof, Either Side Of The Threshold

An illustrative calculation, not a specific customer project. Inputs: usable roof supporting 1.15 MWp DC, 1,250 kWh per kWp specific yield, 70% self-consumption, import at S$0.28 per kWh, SCT export at S$0.20 per kWh.

The larger system earns S$16,000 more per year and arrives up to six months later. On those numbers the delay costs roughly S$150,000 of foregone benefit at the outset, which takes nearly a decade of the S$16,000 annual advantage to recover. For most buyers the sub-threshold design is the better project, and that conclusion is only visible if the proposal reports AC rating rather than DC capacity alone.

Who Should Choose What

• Choose SurgePV if you need credible ECIS modelling, the AC threshold surfaced, and proposals generated from the design record.
• Choose PVsyst where a corporate buyer or lender names it, or on anything clearly above the licensing threshold.
• Choose HelioScope if your team is engineering-only and someone else builds the customer document.
• Avoid Aurora and Enact here. Residential orientation and US scheme assumptions do not fit a commercial market with SCT and ECIS.

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

The Bottom Line

Singapore rewards proposals that are precise about what is contracted and honest about what is forecast.

• Quote SCT as a number and ECIS as a range. One is a fixed rate, the other is a wholesale market, and presenting them identically misrepresents the risk.
• Report AC rating, not just DC. The 1 MWac threshold carries an estimated three to six month licensing timeline that frequently outweighs the extra capacity.