Calculate Solar Panel Returns
According to the MEA/PEA rate and TISO data of the year 2026
Savings on Solar Panels Vision Calculator
The Savings on Solar Panels Vision Calculator estimates a date and calendar estimate for your scenario from the quantities, rates, period, units and other assumptions requested on the page. Replace the example values with your own savings on solar panels vision figures and recalculate after changing an assumption. Use it to compare scenarios, then verify any current rate or fee before acting.
Calculate the return from installing solar panels, the return on investment (ROI) period according to the conditions in Thailand, where the sun is around 4.5 hours per day.
Calculation example
Small house (5 kW): Cost 250,000 Savings per year 80,000 ROI 32%
Medium-sized house (10 kW): Cost 500,000 Savings per year 160,000 ROI 32%
Business (20 kW): Cost 900,000 Savings per year 280,000 ROI 31%
Frequently Asked Questions
What does the payback period mean?
The number of years needed to save electricity equals the cost of installing solar. Example: If the installation costs 250,000 baht but saves electricity 50,000 baht per year, the payback period is 5 years.
What is ROI?
ROI = (Revenue - Cost) ÷ Cost × 100% Example: ROI 20% means that for every baht you invest you get back 0.20 baht per year
Why does the calculation take into account degradation?
Solar panels have an efficiency decrease of about 0.5-0.8% per year due to rain, dust and material deterioration. In long-term calculations, 25 years must be taken into account.
Any other information needed for the decision?
Check that your roof gets enough sunlight, the height of the roof layer, the current roof condition as well as the local regulations for solar installation should consult an installation expert.
Who is a reliable source for Solar in Thailand?
Solar Energy Office (TISO), Ministry of Energy, Metropolitan Electricity Authority (MEA), Regional Electricity Authority (PEA) and Thai Renewable Energy Association.
⚠️ Important.
The calculation results are estimates only. Actual values may vary depending on: cold weather conditions of the area roof conditions construction panel quality country of manufacture. Consult solar installation specialists before making investment decisions.
English calculator guide
How to use the Savings on Solar Panels Vision Calculator
Use this page to test a specific savings on solar panels vision scenario. Enter your own values in the calculator above, review the units beside each field, and recalculate after changing an assumption. The result updates the savings on solar panels vision estimate instead of relying on a generic example.
- Build a baseline savings on solar panels vision case with figures that match your situation.
- Run a second savings on solar panels vision case after changing the rate, period, quantity or other key assumption.
- Record the difference between the two savings on solar panels vision results and the input responsible for it.
Inputs for the savings on solar panels vision estimate
For this savings on solar panels vision calculation, check the quantities, rates, period, units and other assumptions requested on the page. The result is designed to show a date and calendar estimate for your scenario, not a guaranteed provider price or official decision.
How the savings on solar panels vision result is calculated
The calculator compares the selected dates using calendar-based intervals and the date rules shown on the page. Reusing the same savings on solar panels vision inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a savings on solar panels vision decision
Confirm any current rate, threshold or provider rule that could change the final amount. For savings on solar panels vision, Use the estimate to understand likely consumption or cost. Actual bills depend on the applicable tariff, billing period, taxes, fuel adjustments and meter readings. Check the important inputs and any current provider or authority rules before using the result for a decision.
- Language QA
- Terminology, numeric values and calculator controls checked
- Calculator scope
- Date and calendar
- Last English review
- 26 July 2026