If you quote Thai homes and factory roofs, your proposal needs four things. They are Thai text, the right export rule, and any subsidy line. You also need a single line diagram (SLD, a simple drawing of how the system is wired) for the utility. Of the five tools here, OpenSolar and SolarVis list Thai. OpenSolar’s core app is free, but the vendor charges for API Access and connectors from 16 April 2026. SolarVis lists zero-injection systems, which send no power to the grid, and exports an SLD file on its Grow plan and above. Energy Toolbase documents cash, PPA, loan and lease comparisons. SurgePV describes roof modeling, shading, yield, bill of materials and proposals. Its published scope does not name Thai text, a Thai tariff or an SLD. No tool here names Thailand’s rules.
This is a desk comparison of what each vendor publishes, checked October 2026. We have not run side-by-side tests. SurgePV published this page and sells one of the tools on it. Local rules below come from three bodies. They are the Metropolitan Electricity Authority (MEA), the Provincial Electricity Authority (PEA) and the Office of the Energy Regulatory Commission (ERC). Their pages are mostly in Thai. Tool facts come from each vendor’s own site.
Criteria used: Thai text, tariff and export set-up, SLD file, custom incentive line, price in baht, free tier or trial.
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Best-For Picks for Thailand
- Thai proposal with a free core app: OpenSolar. Its help center lists Thai for proposals. It says system text updates when you pick a language, and text that you add yourself is not translated. The core app is free, and the vendor charges for API Access and connectors from 16 April 2026.
- Thai interface, zero injection and an SLD file: SolarVis. It says the whole platform comes in 24 languages, including Thai. It says it supports zero-injection systems. It says the SLD exports as a PDF or DXF file (DXF is a file type that CAD drawing programs open). The SLD editor starts on the Grow plan, 2,490 euros per year.
- A custom incentive line for the subsidy: Aurora Solar, Energy Toolbase or OpenSolar. OpenSolar documents a fixed incentive type. Aurora says admins can create custom incentives. Energy Toolbase’s help center says you can create a custom incentive. None names a Thai subsidy, so you enter the amount yourself.
- Comparing cash, PPA, loan and lease for a factory roof: Energy Toolbase. Its FAQ says the platform models all four. A PPA is a power purchase agreement, where a customer pays for power instead of buying the system. The pages we read do not name Thailand.
- Roof model to bill of materials and proposal in one product, priced per user: SurgePV. It documents roof modeling, shading, yield, financial modeling, bill of materials and proposals, priced per user. Ask in a demo how it handles Thai text, Thai tariffs and the SLD. Its published scope names none of them.
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.
| Tool | Best for | Price | Free or paid | Decisive scope fact |
|---|---|---|---|---|
| Aurora Solar | Custom incentive line, teams already on Aurora | $159 or $259 per user per month (monthly billing); $135 or $220 billed annually | Paid | SLD editor is “only available in Europe” |
| Energy Toolbase | Cash, PPA, loan and lease comparison | Not published; book a call | Paid | FAQ lists cash, PPA, loan and lease; Thailand not named |
| OpenSolar | Thai proposal, fixed incentive line | Core app free of charge; API Access and connectors charged from 16 April 2026 | Free core app, paid API and connectors | SLD list names 10 countries; Thailand is not one |
| SolarVis | Thai interface, zero injection, SLD file | From 990 euros per year (Starter) | Paid, 7-day trial, no card | SLD editor from the Grow plan; Thailand is 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 | BOM and proposal generation in scope; no Thai item stated |
Thailand Criteria Matrix
Each cell says Documented, Partial or Not stated. Documented: the vendor’s own page states the item. Partial: the page states something close, not the full item. Not stated: the pages we read in October 2026 are silent. We use no scores or weights.
| Tool | Thai text | Tariff and export set-up | SLD file | Custom incentive line | Price in baht | Free tier or trial |
|---|---|---|---|---|---|---|
| Aurora Solar | Not stated | Partial (edit rates; net billing or feed-in tariff per design; rate shown in $; Thailand not named) | Not stated for Thailand (editor is Europe only) | Documented (admins create custom incentives) | Not published (USD) | Not stated on the pricing page |
| Energy Toolbase | Not stated | Partial (built-in rate database and your own rate schedules; cash, PPA, loan and lease; Thailand not named) | Not stated | Documented (help center: you can create a custom incentive) | Not published for ETB Developer | Not stated |
| OpenSolar | Documented (Thai listed for proposals; your own text is not translated) | Partial (custom tariff with a country field and compensation options; Thailand not named) | Not stated for Thailand (list of 10 countries) | Documented (fixed incentive type) | Documented (core app free; API Access and connectors charged from 16 April 2026) | Documented (core app free) |
| SolarVis | Documented (24 languages, including Thai) | Partial (tariff configurator; zero injection documented; Thailand not named as pre-built) | Documented (PDF or DXF; Grow plan and above; Thai format not stated) | Partial (page says proposals carry local tariffs, incentives and savings) | Not published (EUR) | Documented (7 days, no card) |
| SurgePV | Not stated | Not stated | Not stated | Not stated | Not published (USD) | No self-serve trial; guided demo |
Two things stand out. No vendor page we read names Thailand’s tariffs or the 2.20 baht buy-back price, and none publishes a price in baht. A tool that does not state these items may still support them, so ask each vendor to quote one real Thai job before you buy.
Tool Entries
Aurora Solar
Best for: teams already on Aurora that want its design and proposal platform and will add the Thai tariff, text and subsidy lines by hand.
Not the right choice if: you need a documented Thai proposal, a Thai tariff or an SLD file. The pages we read do not state them, and the SLD editor is described as only available in Europe.
What the vendor documents: Basic lists tablet-friendly sales proposals, and Premium adds LIDAR-assisted modeling, bankable shade reports and battery modeling. The help center article on incentives says admins can create custom incentives, which show in Sales Mode and in proposals. A second article, on editing utility rates explains the compensation policy you set for each design: net billing or a feed-in tariff. Its rate field is in dollars per kWh.
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 is $259 per user per month, or $220 billed annually ($2,640 billed annually). Enterprise is custom, per project. The page shows a dollar sign and does not name the currency.
Limitations: the single line diagram editor is “only available in Europe”, per Aurora’s help center. We found no Thai text and no mention of Thailand on the pages we read.
Vendor link: aurorasolar.com.
Energy Toolbase
Best for: teams that compare cash, PPA, loan and lease options for a business customer. They bring their own Thai tariff and design.
Not the right choice if: you need Thai text, a Thai tariff or a published price. The pages we read do not state them. Its pricing page asks you to book a 30-minute call for a demo and pricing.
What the vendor documents: its FAQ says ETB Developer supports cash purchases, PPAs, loans and leases. It also has a built-in database of utility rates, incentives and tariffs. Its rate schedules article says you can create your own rate schedule, and its incentives article says you can create a custom incentive. It also says the platform is web-based and can analyze standalone storage. Its product page lists unlimited proposals, branded templates, proposal tracking and lead management.
Price (checked October 2026): not published for ETB Developer. The pricing page says you get pricing for your team size on a call.
Limitations: the pages we read describe utility rates and net metering programs without naming Thailand. Its help center says you can create your own rate schedule and your own incentive. Ask how a Thai tariff would be entered.
Vendor link: energytoolbase.com.
OpenSolar
Best for: installers who want a free core app and a Thai proposal, and who will build the Thai tariff and the export price themselves.
Not the right choice if: you need an SLD for a Thai application. The SLD help article says SLDs are supported in 10 countries. They are Australia, New Zealand, the United States, Canada, the United Kingdom, France, Germany, Italy, Spain and India. Thailand is not on that list.
What the vendor documents: the help center article on proposal language lists 13 languages, including Thai. One help article says a proposal needs a template that was translated by hand. A second article lists Thai, and says system text updates when you pick a language. It also says custom text is not translated. Its tariff article lets you create a custom tariff with a country field. It lists four compensation options: Net Billing, Net Billing with Credit Carryover, Buy All Sell All and Net Energy Metering. Its incentives article lists Fixed, Size Based, Price Based and Performance Based types.
Price (checked October 2026): the vendor says the core app is free of charge for solar professionals. Two things cost money from 16 April 2026. API Access, which lets other software connect to OpenSolar, is a per-project fee. Supported connectors are a flat monthly subscription. The date comes from its 16 February 2026 post and the billing types from its API page. Optional paid Enterprise Services: Support US$500 per month, Customize US$1,350 per month, Enterprise custom.
Limitations: you set up and update the tariff, the baht amounts, the subsidy and the export price yourself. The pages we read do not list the currencies it supports. The second help article tells you to check currency formatting after you change a proposal language.
Vendor link: opensolar.com.
SolarVis
Best for: teams that want a Thai interface, zero-injection design and an SLD file in one platform, and will build the Thai tariff themselves.
Not the right choice if: you want a Thai tariff that is ready made. The tariff page names ten pre-built markets and says “and more”, but does not name Thailand. It is also not for a team on the Starter plan that needs the SLD, since the plan table starts the SLD editor at Grow.
What the vendor documents: its proposal page says the whole platform comes in 24 languages, including Thai. Each user picks an interface language. The same page says you can model on-grid, off-grid and zero-injection systems. That setting fits a system that uses all its power on site and sells none. The page says the SLD is generated from the 3D design, then exported as PDF or DXF. Cable sizing and protection devices stay with the engineer. The SLD is a separate sheet, not a page of the customer proposal. The page also says proposals carry local tariffs, incentives and savings.
Price (checked October 2026): the pricing page shows euros, billed annually. Starter costs 990 euros per year. It covers 1 user, projects up to 100 kWp and 150 projects per year. Each extra user is 200 euros. Grow costs 2,490 euros per year for 2 users, projects up to 3 MWp and 600 projects per year, with 300 euros per extra user. Scale costs 4,790 euros per year for 5 users, with 400 euros per extra user. Enterprise is custom. The free trial lasts 7 days and needs no card.
Limitations: for a market that is not pre-built, its tariff page says any other market is “fully configurable in the tariff configurator”. Its proposal page says you can add the rules yourself or contact SolarVis to request support for that market. Its pricing page FAQ adds that Enterprise onboarding “can help validate a new country setup”. Ask what this means for Thailand.
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 to start on your own with a trial, because SurgePV offers a guided demo. It is also not for you if you need a baht price in writing before a sales call. The pricing page lists USD per user per year for visitors outside India. Choose another tool if Thai text, a Thai tariff or an SLD file must be stated today. OpenSolar and SolarVis state Thai, and SolarVis states an SLD file. SurgePV outputs support design and paperwork. An engineer, the utility or the lender still has to approve the system. 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 proposal 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. Prices are in US dollars. Confirm any amount in baht and taxes in a written quote.
Limitations: results depend on source data, assumptions and equipment models. The pricing page and published scope do not state Thai text, a Thai tariff, a subsidy line or an SLD file.
Vendor link: surgepv.com.
Thailand Rules That Shape the Choice
The rules below come from Thai government pages, mostly in Thai. We read them on 29 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 system. PEA uses its PPIM system (Power Producer Information Management System). Its 3 July 2569 (2026) notice points to a filing guide. We read the MEA terms in full below. For PEA we read only that notice, so check PEA’s own terms for homes in its area.
The ERC notice. The ERC’s rooftop page says two kinds of operator can file a notice for an exemption from needing a license. One sells to the grid under a contract with the utility. The other uses the power inside its own building without selling. The same page lists building permit forms and a checklist. Ask your engineer which forms apply to your building.
The 2026 home buy-back (MEA). MEA’s notice of 30 June 2569 (2026) covers homes. The applicant must be an individual who owns a residential meter. The scheme has a national target of 500 MW. It allows up to 5 kW per meter. It pays 2.20 baht per unit for surplus power for 10 years. Requests are handled first come, first served, and MEA opened applications on 1 July 2569 (2026). The system must start commercial operation within 2570 (2027). A proposal for this scheme should price surplus power at 2.20 baht.
Export limit. The same notice says an inverter above 5 kW needs an export limiting device, a device that stops power flowing back to the grid. The device must keep export to 5 kW or less. A table in the notice caps total inverter size by meter size. The inverter and the export limiting device must pass MEA’s tests. So a proposal for a larger system needs a line for this device.
Papers MEA asks for. The notice lists a single line diagram signed by an electrical engineer, and a copy of the engineer’s license. It lists test papers for inverters that are not yet registered, and a routine test report for inverters above 10 kW. It also lists photos of the installed inverter showing brand, model and firmware.
The 50,000 baht subsidy. MEA’s People’s Solar page offers up to 50,000 baht to a Thai individual who has a residential meter. It is limited to 1,000,000 people, or until the budget runs out. The system must be 5 to 10 kWp per meter. You must install through MEA, PEA or a contractor registered with them. You must apply to connect by 31 August 2570 (2027) and be connected by 30 September 2570 (2027). The page says registration is not approval. It also says the applicant must not use the income tax exemption in Royal Decree 805 of 2569, in whole or in part. Both programs list different sizes, so ask MEA whether one home can use both.
Bills and tariffs. MEA lists its tariffs by customer type and has a page titled What is the Ft charge. Quote in baht (THB), the Thai currency, 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 text: the customer reads the proposal, so the language matters. We did not assess how complete any translation is.
- Tariff and export set-up: savings depend on the bill rules and on how much power you may export. We did not assess how any tool models the 2.20 baht price or the 5 kW limit.
- SLD file: MEA asks for an SLD signed by an engineer. We did not assess whether any diagram meets MEA’s or PEA’s format.
- Custom incentive line: the subsidy changes the price the customer pays. We did not assess how any tool shows a fixed amount in the proposal.
- Price in baht: Thai buyers think in baht, and no tool here publishes a baht price. We did not assess discounts or negotiated quotes.
- Free tier or trial: a small Thai installer can test a free plan before it pays. We did not assess plan limits beyond what each 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 PVsyst or PV*SOL here. They are simulation programs for Windows. See our solar design software list for Thailand for design tools. This list covers five tools, so it covers fewer than the topic suggests.
Sources and Dates
Vendor pages were read in October 2026. The sources are listed by vendor. Aurora (pricing and three help center articles above). Energy Toolbase (pricing, FAQ, product page and two help center articles). OpenSolar (free and five help center articles above). SolarVis (pricing, proposal page and tariff page). SurgePV (pricing). Government sources are the MEA, PEA and ERC pages linked above. We read the Thai text ourselves. Help center articles were read in a browser.
See SurgePV on your own Thai project
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Book a Free DemoGo Deeper on a Category
- Best solar software in Thailand, the all-purpose list for the country
- Solar design software for Thailand
- Solar proposal software for Malaysia and Vietnam, the nearest country lists
- Best solar proposal software, all markets
Frequently Asked Questions
What is the best solar proposal software in Thailand?
It depends on what your quote must show. Of the five tools here, OpenSolar and SolarVis list Thai. OpenSolar’s core app is free, but the vendor charges for API Access and supported connectors from 16 April 2026. SolarVis lists zero-injection systems and exports a single line diagram as a PDF or DXF file on its Grow plan and above. Energy Toolbase documents cash, PPA, loan and lease comparisons. No tool here names Thailand’s tariffs, so ask each vendor to quote one real Thai job.
Does solar proposal software support Thai language and baht?
OpenSolar’s help center lists Thai for proposals, and SolarVis says its whole platform is available in 24 languages, including Thai. The Aurora, Energy Toolbase and SurgePV pages we read do not state a Thai option. No vendor here publishes a price in baht, the Thai currency. The pages we read do not say which currencies OpenSolar supports, so ask each vendor to show a baht proposal before you buy.
What export price should a Thai home proposal show?
MEA’s notice of 30 June 2569 (2026) pays 2.20 baht per unit for surplus power from homes, for 10 years. It limits sales to 5 kW per meter. It says an inverter above 5 kW needs an export limiting device that keeps export to 5 kW. These are MEA terms. PEA has its own pages, so check which utility serves the home before you quote.
Does the 50,000 baht subsidy change a Thai quote?
MEA’s People’s Solar page offers up to 50,000 baht for each person, for a 5 to 10 kWp system on one residential meter. The applicant must be a Thai individual, and the tax invoice must be dated after registration opens. The applicant must not also use the tax exemption in Royal Decree 805 of 2569. Show the subsidy as a separate line, and check that the tool lets you enter a fixed amount.
What drawings does MEA ask for in a solar application?
MEA’s buy-back notice lists a single line diagram signed by an electrical engineer, plus a copy of the engineer’s license. It also lists inverter test papers and photos of the installed inverter. Check that your tool can output the diagram, and that your engineer can review it before signing.
How much does solar proposal software cost in Thailand?
No vendor here publishes a price in baht. OpenSolar’s core app is free, with charges for API Access and connectors from 16 April 2026. SolarVis Starter is 990 euros per year. Aurora Basic is $159 per user per month billed monthly. SurgePV Individual is $1,899 per user per year. Energy Toolbase does not publish a price for ETB Developer. Ask for a written quote in baht.
