Which solar software fits Thailand? Thai rooftop work has three local needs: the Thai language, a tariff you can edit, and a single line diagram (SLD, a simple drawing of how the system is wired) for the utility. The two utilities are the Metropolitan Electricity Authority (MEA) and the Provincial Electricity Authority (PEA). On the pages we read, OpenSolar and SolarVis are the two tools that name Thai. HelioScope lists an SLD on every plan. PVsyst is for yield studies, and the pages we read describe no customer proposals. No vendor page we read describes Thai tariffs or PEA and MEA rules.
This is a desk comparison of what each vendor publishes, checked October 2026. We have not run side-by-side tests. Local rules come from MEA, PEA, the Energy Regulatory Commission (ERC) and the Revenue Department. Tool facts come from each vendor’s own site. This page covers software in general. For design tools, see solar design software in Thailand. For quotes, see solar proposal software in Thailand.
Criteria used: Thai language, tariff and export entry, single line diagram, price in baht, free tier or trial.
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Best-For Picks for Thailand
- Thai-language proposals in a free core app: OpenSolar. Its language article lists Thai. You translate a proposal template yourself. The core app is free. The vendor charges for API Access and connectors from 16 April 2026.
- Thai interface and a tariff you build yourself: SolarVis. Its proposal page says the platform is available in 24 languages, including Thai. Its tariff page says the configurator handles feed-in tariffs, net metering, currency and VAT. Thailand is not one of its ten named pre-built markets, but the page says there are more. Prices are in euros.
- Commercial rooftop, carport and ground designs with an SLD on every plan: HelioScope. Its pricing page lists single-line diagrams on all plans. It designs up to 1.25 MW DC on Basic, 5 MW on Pro and 30 MW on Enterprise.
- Yield study with imported weather data and feed-in economics: PVsyst. Its economics help describes a fixed feed-in tariff and self-consumption. It runs on Windows only and has no Thai language. The pages we read describe no customer proposals.
- Roof model to bill of materials and proposal in one product, priced per user: SurgePV. It lists roof modeling, shading, yield, financial modeling, bill of materials (BOM, the parts list) and proposals. Ask in a demo about Thai tariffs, Thai language and the SLD. Its published scope does not state them.
Aurora Solar has no pick on this page. Its pages we read do not name Thailand, and its SLD editor article says the editor is only available in Europe.
Comparison Table
Listed alphabetically. This is not a ranking; pick by the situation above. Prices checked October 2026 on each vendor’s own page. No vendor publishes a price in baht (THB).
| Tool | Best for | Price | Free or paid | Decisive scope fact |
|---|---|---|---|---|
| Aurora Solar | Teams already on Aurora | $159 or $259 per user per month billed monthly; $135 or $220 billed annually | Paid | Edits utility rates; no Thailand page |
| HelioScope | Commercial designs with an SLD | $159 USD or $259 USD per license per month; $1,620 USD or $2,640 USD per license per year | Paid, free trial | SLD on all plans; up to 1.25 MW DC on Basic |
| OpenSolar | Free Thai-language quoting | Core app free; API Access and connectors charged from 16 April 2026 | Free core app, paid API and connectors | Thai on its language list |
| PVsyst | Yield study with imported weather | CHF 700 per year (PVsyst 8 Professional) | Paid, one-month trial | Feed-in and self-consumption economics; Windows only |
| SolarVis | Thai interface, custom tariff | From 990 euros per year (Starter) | Paid, 7-day trial | Thai interface; Thailand not named as pre-built |
| SurgePV | Roof model to BOM and proposal, per user | $1,899 per user per year (1 user), in US dollars | Paid, guided demo | Proposal generation in scope; no Thai item stated |
Thailand Criteria Matrix
Each cell is Documented, Partial or Not stated. Documented means the vendor’s own page states it. Partial means the page states a related feature but not the full item. Not stated means the pages we read in October 2026 do not say. There are no scores or weights.
| Tool | Thai language | Tariff and export entry | Single line diagram | Price in baht | Free tier or trial |
|---|---|---|---|---|---|
| Aurora Solar | Not stated | Partial (edit utility rates; net billing or feed-in tariff) | Partial (editor article says only available in Europe) | Not published (dollars) | Not stated |
| HelioScope | Not stated | Partial (Utility Rate Editor and financial tools on Pro) | Documented (all plans) | Not published (USD) | Documented (free trial) |
| OpenSolar | Documented (language list) | Documented (custom tariff; Buy All, Sell All) | Partial (10 listed countries; Thailand not listed) | Not published (core app free) | Documented (core app free) |
| PVsyst | Not stated (12 languages listed, not Thai) | Documented (feed-in tariff; self-consumption) | Documented (grid-connected systems; work in progress) | Not published (CHF) | Documented (one-month trial) |
| SolarVis | Documented (interface) | Documented (configurator) | Documented (Grow plan and up) | Not published (euros) | Documented (7-day trial) |
| SurgePV | Not stated | Partial (financial modeling listed; tariff entry not described) | Not stated (electrical workflow support listed; no diagram named) | Not published (USD) | Not stated (guided demo) |
Two things stand out. Only OpenSolar and SolarVis name Thai, and no vendor publishes a price in baht. A tool that does not state an item may still support it, so ask each vendor to quote one real Thai job.
Tool Entries
Aurora Solar
Best for: teams already on Aurora that will enter Thai rates by hand.
Not the right choice if: you need a Thai language option, an SLD for a Thai utility or a baht price. None appears on the pages we read.
What the vendor documents: its pricing page lists a utility rate database you can configure with your own rates, web and PDF proposals, and Premium features such as LIDAR-assisted modeling and bankable shade reports. Its rates article says you can set how exports are paid, either net billing or a feed-in tariff.
Price (checked October 2026): Basic $159 per user per month billed monthly, or $135 per user per month billed annually ($1,620 billed annually); Premium $259 per user per month, or $220 billed annually ($2,640 billed annually). This is the North America tab. The page shows a dollar sign and does not name the currency. Enterprise is custom.
Limitations: the pages we read do not name Thailand. A search of its help center for “Thailand” returned no results.
Vendor link: aurorasolar.com.
HelioScope
Best for: commercial installers who want rooftop, carport and ground-mount designs with an SLD, and who will add Thai rates by hand.
Not the right choice if: you need a Thai language option or a baht price, or a design larger than 30 MW DC. None appears on its pricing page. Its Basic plan stops at 1.25 MW DC and lacks the financial tools.
What the vendor documents: its pricing page lists rooftop, carport and ground mount on all projects, storage design, CAD export and single-line diagrams on every plan. Pro adds financial modeling and sales proposals, and P90, P95 and P99 values. Enterprise adds single-axis trackers and PVsyst export. Global weather coverage is listed on every plan.
Price (checked October 2026): Basic $159 USD per license per month (1 user, 10 projects per month) or $1,620 USD per license per year (120 projects); Pro $259 USD per month or $2,640 USD per year. Enterprise is custom per project. The page lists a free trial.
Limitations: the pages we read do not name Thailand, PEA or MEA.
Vendor link: helioscope.aurorasolar.com.
OpenSolar
Best for: installers who want a free core app and Thai-language proposals, and who will build the Thai tariff as a custom tariff.
Not the right choice if: you need a ready-made PEA or MEA tariff or a Thai SLD. Its SLD article lists AU, NZ, US, CA, UK, FR, DE, IT, ES and IN, not Thailand.
What the vendor documents: its language article lists Thai among 13 supported languages. A proposal shows in another language only if you translate a template. Its tariff article lets you create a custom tariff with a Country field. The compensation options are Net Billing, Net Billing with Credit Carryover, Buy All, Sell All and Net Energy Metering.
Price (checked October 2026): the core app is free of charge for solar professionals, per the vendor. From 16 April 2026 the vendor charges for API Access and supported connectors. API Access lets other software connect to OpenSolar. This comes from its 16 February 2026 post.
Limitations: the tariff, the currency and the SLD are yours to set up by hand. No Thai tariff is described on the pages we read.
Vendor link: opensolar.com.
PVsyst
Best for: engineers who need a yield study with imported weather data and an economic model for a Thai project.
Not the right choice if: you need a customer proposal or a Thai language option. We found no quotation or customer proposal pages in its help index. Its product page says it only runs on Windows and lists 12 languages without Thai.
What the vendor documents: its product page lists weather import from Meteonorm 9, NASA-Power, PVGIS-TMY, NLR/NSRDB TMY, Solcast TMY, Solar Anywhere TGY and Solargis. Its economics help describes a fixed feed-in tariff, hourly or seasonal tariffs and self-consumption economy. Its SLD help says the diagram editor is for grid-connected systems, excludes storage and is still work in progress.
Price (checked October 2026): PVsyst 8 Professional CHF 700 per year, with a one-month free trial. The page lists discounts of 5% for 2 to 4 licenses, 15% for 5 to 9 and 20% for 10 or more. Prices are in Swiss francs.
Limitations: one license per computer. The pages we read do not name Thailand.
Vendor link: pvsyst.com.
SolarVis
Best for: teams that want a Thai interface and are ready to build the Thai tariff in a configurator.
Not the right choice if: you need a ready-made Thai tariff. Its tariff page names the US, UK, Germany, Türkiye, South Africa, Italy, Spain, France, Poland and the Netherlands “and more” as pre-built. It does not name Thailand. It says any other market is set up in the configurator.
What the vendor documents: its proposal software page says the platform is available in 24 languages, including Thai. Each user picks an interface language. The tariff page says the configurator covers feed-in tariffs, net metering, currency and VAT. Its pricing page lists a single line diagram editor from the Grow plan.
Price (checked October 2026): Starter 990 euros per year (1 user included, up to 100 kWp, plus 200 euros per extra user); Grow 2,490 euros (2 users, up to 3 MWp); Scale 4,790 euros (5 users, up to 10 MWp). Prices are in euros, billed annually. Enterprise is custom, up to 50 MWp. A 7-day free trial starts after a short call, with no credit card.
Limitations: the pages we read do not say whether proposals can be written in Thai.
Vendor link: solarvis.co.
SurgePV
SurgePV is our product.
Best for: teams that want roof modeling, shading, yield, financial modeling, bill of materials and proposals in one product, priced per user. They will confirm the Thai items in a demo.
Not the right choice if: you want a self-serve trial, because SurgePV offers a guided demo. It is also not right if you need a Thai interface, a baht price or a documented SLD today, because the published scope does not state them. Results depend on source data, assumptions and equipment models. Outputs support design and documentation. They do not replace approval by the responsible engineer, authority, lender or utility. SurgePV’s published product scope does not list a CRM. Monitoring and ERP are outside its published scope.
What the vendor documents: 3D roof modeling, array layout, shading analysis and energy-yield modeling. It also lists financial modeling, electrical workflow support, bill-of-materials output and proposal generation. See solar design software for the product page.
Price (checked October 2026): $1,899 per user per year for 1 user, $1,499 per user for 3 seats, $1,299 per user for 5 seats, in US dollars.
Limitations: the published scope does not state Thai tariffs, a Thai language option, an SLD or a baht price.
Vendor link: surgepv.com.
Thailand Rules That Shape the Choice
The rules below come from Thai government pages, mostly in Thai. We read them in October 2026. Thai notices use Buddhist Era years, which are 543 years ahead of the Western year. So 2569 is 2026, and 2570 is 2027.
Who you apply to. You connect a rooftop system to MEA or PEA. MEA takes applications through its MyEnergy site. PEA uses its PPIM system, and its 3 July 2026 notice links a filing guide. PEA also lists a separate request to connect a system for your own use, with no export.
The ERC notice. The Energy Regulatory Commission (ERC) rooftop page says an operator that sells to the grid under a power purchase contract, or uses the power inside its own building without selling, can file a notice that it is exempt from needing a license. The same page lists building permit forms and a checklist for the design code of practice. Ask your engineer which forms apply to your building.
The 2026 home buy-back. MEA’s notice of 30 June 2026 covers homes. It allows up to 5 kW per meter and pays 2.20 baht per unit for surplus power for 10 years. The nationwide target is up to 500 MW. Requests are handled first come, first served, and MEA opened applications on 1 July 2026. The inverter must pass MEA’s test. A proposal for this scheme should price surplus power at 2.20 baht.
The 50,000 baht subsidy. MEA’s People’s Solar page offers 50,000 baht per person to a Thai individual who has a home electricity account. The system must be 5 to 10 kWp per meter. You must install through MEA, PEA or an installer registered with them. You must apply to connect by 31 August 2570 (2027) and be connected by 30 September 2570 (2027). Its rules say the applicant must not use the Royal Decree 805 tax exemption, in whole or in part.
The tax exemption. Royal Decree 805 of 2569 (2026), in the Royal Gazette copy on the Revenue Department site, exempts an individual’s income from tax, up to the amount actually paid to buy and install a rooftop system, with a total cap of 200,000 baht. The system must connect to the MEA or PEA grid. You can claim once, in the tax year the connection finishes. Costs must be paid by 31 December 2571 (2028). You must pay a VAT-registered business and get an e-tax invoice.
Price and currency. Quote in baht, and say which tariff and which date you used for the bill savings.
Regulator pointer. Start with the MEA and PEA pages above, then the ERC page. We have no Thailand compliance guide on this site yet.
How We Ordered These Tools
SurgePV publishes this page and is a vendor on this list. Its entry uses the same vendor-page sources and template as every other tool here.
We did not rank these tools. They are listed alphabetically, and the best-for picks come from the matrix above.
- Thai language: staff and clients may need Thai screens and proposals. We did not assess translation quality.
- Tariff and export entry: Thai home rules pay a fixed sell rate, so a tool must let you enter one. We did not assess whether any tool applies the MEA or PEA tariff correctly.
- Single line diagram: the utilities ask for drawings from your engineer. We did not assess whether any output is accepted by MEA or PEA.
- Price in baht: a baht price shows what a Thai buyer will pay. We did not assess discounts or negotiated quotes.
- Free tier or trial: a free plan lets a small team test the workflow. We did not assess the limits of any free plan beyond what its page states.
Not Compared Here
Solargraf is not compared on this page. Its site, solargraf.com, returned HTTP 403 to automated reads, including a headless browser, in October 2026. We also did not compare Arka360, Pylon, Sunbase or Energy Toolbase for Thailand. So this list covers fewer tools than the topic suggests.
Sources and Dates
Vendor pages were read in October 2026. They are Aurora (pricing and help center), HelioScope (pricing), OpenSolar (free, its tariff, language and SLD articles), PVsyst (product page and help), SolarVis (pricing, proposal software and tariff pages) and SurgePV (pricing). Government sources are the MEA, PEA, ERC and Revenue Department pages linked above. Help-center articles were read in a browser.
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- Solar design software in Thailand
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Frequently Asked Questions
What is the best solar software in Thailand?
It depends on the job. OpenSolar and SolarVis are the two tools whose pages name Thai. HelioScope lists a single line diagram on every plan and designs up to 1.25 MW DC on its entry plan. PVsyst is built for yield studies, and the pages we read describe no customer proposals. No vendor page we read describes Thai tariffs or PEA and MEA rules, so ask each vendor to quote one real Thai job.
Is there solar software with a Thai interface or Thai proposals?
OpenSolar lists Thai among its supported languages, and its proposals need a template you translate yourself. SolarVis says its whole platform is available in 24 languages, including Thai. PVsyst lists 12 languages, and Thai is not one of them. The Aurora, HelioScope and SurgePV pages we read do not state a Thai option.
Which tool can model the Thai tariff and the rooftop buy-back?
OpenSolar and SolarVis both describe tariffs you build yourself, and OpenSolar lists a Buy All, Sell All option. PVsyst describes a fixed feed-in tariff and self-consumption economics. Aurora lets you edit utility rates and set net billing or a feed-in tariff. None of these pages names PEA, MEA or the 2.20 baht rate, so you enter them yourself.
What are the 2026 rooftop rules for Thai homes?
MEA says the 2026 buy-back round is for homes. It allows up to 5 kW per meter and pays 2.20 baht per unit for 10 years. The nationwide target is up to 500 MW, and requests are handled first come, first served. A separate MEA subsidy pays 50,000 baht per person for a 5 to 10 kWp system. Rules can change, so check MEA or PEA before you quote.
How much does solar software cost in Thailand?
No vendor here publishes a price in baht. HelioScope Basic is $159 USD per license per month, or $1,620 USD per license per year. PVsyst 8 Professional is CHF 700 per year. SolarVis Starter is 990 euros per year. SurgePV Individual is $1,899 per user per year in US dollars. OpenSolar’s core app is free, and Aurora Basic is $159 per user per month billed monthly.
Do PEA or MEA require a specific design software?
The MEA and PEA pages we read name forms, portals and tests, not software. MEA says the inverter must pass MEA’s test. The ERC page lists a design code-of-practice checklist and building permit forms. Ask MEA or PEA what your file must contain, then check that your tool can produce it.
