Solar software built for one country often fails quietly in another: the currency, tax, incentives, wind code and grid rules are all different. Before you adopt any tool outside its home market, check six things, and ask the vendor to show each one with your own site.
1. Currency and tax
Quotations and invoices must be in your currency, with your tax (GST, VAT or sales tax) applied the way your authority expects. Ask to see a real invoice and a real quotation.
2. Incentives and net metering
Incentives change often and differ by country and even by state. A tool should either model the rule you actually have, or let you set your own, instead of showing someone else's subsidy. Be wary of any tool that shows a national incentive without saying where the rule comes from.
3. Climate and sun data
Yield estimates need irradiance and temperature data for the exact site, from a source you can name. Ask where it comes from and whether it covers your location.
4. Wind, snow and structure codes
Structure design follows a local code: IS 875 in India, ASCE 7 in the United States, the Eurocodes in Europe, and others elsewhere. A tool that has the local code can use it; one that does not should say it is showing a typical value and that the local code governs.
5. Electrical rules and equipment
Voltage and frequency, single-phase versus split-phase or three-phase, inverter sizing limits and approved equipment lists vary. Check that the equipment database includes the brands you can actually buy.
6. Units, language and support hours
Square metres or square feet, kilowatts, local address search and map imagery that is current for your area all matter on site. Check that support is available in your time zone.
How RAYVO approaches this
RAYVO's design studio carries starting assumptions for 24 countries, from India and the United Kingdom to Germany, Australia and the United Arab Emirates: currency, units, electricity tariff, installed cost and the incentive where one is modelled. They are editable estimates, and every proposal states the assumptions it used. India is the most complete today, with GST, the PM Surya Ghar subsidy and IS 875 built in. Elsewhere the wind figure is a flagged typical value and the local code governs. See the 3D Solar Design page, or talk to the team about your country.