About · methodology
How evchu works
evchu is an independent database of every electric car on sale in Thailand: prices, specifications, price history and official registrations. This page explains where each number comes from, how numbers become scores and verdicts, how often everything updates, and what to do if you spot a mistake.
Tracking now: 51 brands · 140 models · 300 trims on sale in Thailand
Who runs evchu
evchu is an independent project. It is not owned by, funded by or affiliated with any carmaker, importer, dealer or media group. No brand pays to appear on evchu or to rank higher, and scores, rankings and buy-or-wait verdicts are calculated the same way for every car.
Questions, data requests and corrections all go to the same place, and every message is read.
Where every number comes from
Every figure on evchu is stored with the date it was observed and the source it came from.
New-car prices and specifications
From each brand’s official Thai price list, website and launch announcements. Every brand has a research document that records each price and specification with its source before it reaches the database, and that document is what the site is built from. Automated checks re-read brand websites and Thai price-comparison sites twice a week, and every price ever observed is kept with its date. That record is what the price-history charts show.
Registrations
From Thailand’s Department of Land Transport (DLT). Market totals come from DLT’s monthly report of new registrations by fuel type, published about a week after each month ends. Figures by brand and model come from DLT’s new-car registration files by model, posted alongside it and matched to evchu’s catalogue.
News and policy events
Daily feeds from motoring news sites tell us when a price, a model or a policy changes. Policy events such as subsidy deadlines link to the government notice or news report they come from.
Used-car prices
Asking prices from public listings on Thai second-hand car sites. They are asking prices, not final sale prices, and used-market figures show when they were last checked.
Nothing is thrown away. Every page we read is stored exactly as captured before any figure is taken from it, so if a website changes and a figure is misread, it can be checked against the original.
See Thai EV sales by month →How the evchu Score works
Every EV on sale gets an evchu Score from 0 to 100. Each part of the score is a percentile: 80 means the car does better than 80% of the electric cars currently on sale in Thailand on that measure. Nothing is rated by hand.
Five measures are scored against every current EV, then blended with fixed weights:
- Value25% of the score
Real-world range per baht of price.
- Range25% of the score
Real-world range. Where a brand publishes only a WLTP figure, we use 85% of it.
- Cost to own20% of the score
Estimated monthly cost of ownership from our cost-to-own calculator. Lower is better.
- Charging15% of the score
Peak DC fast-charging power.
- Performance15% of the score
0–100 km/h time. Lower is better.
If a figure is missing, that measure is left out and the other weights are scaled up instead of guessing; a car with fewer than three measures gets no score. 85 and above reads as an excellent all-rounder, 70 and above strong, 55 and above a solid choice, and below that a niche pick. Scores move when prices change or new cars arrive, because each car is ranked against today’s field.
Buy now or wait?
Buy-or-wait verdicts follow written rules, not opinions. A confirmed recent price cut or a run of price rises argues for buying now; an announced facelift, a new model year or an expiring subsidy argues for waiting. Every verdict links to the price history and dated events behind it.
Buy now or wait? →How often data updates
- New-car prices
- Checked automatically twice a week, every Monday and Thursday.
- Catalogue review
- Every day. A maintenance job works through new models, price changes and gaps the checks have flagged. An AI model researches each item against the brand’s official source and writes the finding, with its source, into the research document. Automated checks must pass before anything goes live, and every change visitors can see is logged in the public changelog.
- News and registrations
- News feeds are read daily. DLT’s monthly registration report is checked daily and added the day it is published; model-level registrations are checked daily too and added when DLT posts the month’s file.
- Pages
- Rebuilt at least every hour, so a change reaches the site within about an hour of entering the database.
Corrections policy
If a price, specification or figure looks wrong, email contact@evchu.com with the page and, if you have one, a link to the source showing the correct figure. Brands and importers are welcome to send their official price lists.
We check every report against the primary source: the brand’s official price list, the DLT file or the original announcement. If we were wrong, we correct it, record the source in the research document, and the change appears in the changelog.
Price history is kept honest. A figure that was simply wrong is corrected or removed, but real price moves are never deleted, so every price chart shows what was actually charged and when.
We do not accept payment to change a figure, a score or a verdict.
Questions, data requests or corrections