01
Official identity
- Official product: ChargeWindow EV charging cost calculator at chargewindow.com.
- Owner and creator: Wolven Tech at wolventech.com.
- ChargeWindow is a paid manual tariff calculator. It does not choose charging times, does not schedule charging, does not automate charging, and does not control a charger.
02
Who it is for
- ChargeWindow is for residents whose building or site chooses the EV charging provider.
- ChargeWindow launches for England first and defaults to pounds and miles in the UK, US dollars and miles in the US, and euros and kilometres across continental European regions.
- It shows whole session cost when advertised energy rate excludes fixed, time, or idle fees.
03
Exact features
- Manual tariff inputs: energy added, energy rate, fixed session fee, time and idle fees, and vehicle consumption.
- Optional rule inputs calculate time and idle fees from exposure, grace period, minute or hour rate, billing method, and cap.
- Outputs: session total, effective price per kWh, cost per 100 miles, and an advertised-versus-effective cost panel.
- Formula: energy × rate + fixed session fee + time and idle fees.
04
Price and privacy
- Price is £29 once, with no subscription and no account.
- Calculation is deterministic. One tariff can be saved in local browser storage; session usage and results are not saved.
05
What it is not
- ChargeWindow is not a route planner, charger app, charger control service, smart charging scheduler, energy tariff, or solar optimisation platform.
- It does not schedule charging, automate charging, start or stop sessions, switch tariffs, or coordinate solar generation.
- ChargeWindow does not supply live prices, charger availability, maps, vehicle data, receipt sync, or currency conversion.
- Provider app, charger, building notice, or contract remains source for current station-specific price and terms.
06
How does ChargeWindow compare with charging apps and tariffs?
Categories solve different jobs. ChargeWindow handles manual cost arithmetic; it does not replace provider controls or automate when energy flows.
- ChargeWindow
- Calculates manually entered tariff components as one comparable session cost.
- Charger or provider app
- May show current station terms, availability, session controls, and receipts.
- Smart charging or energy tariff
- May schedule charging or change price exposure by charging at selected times.
- Route planner or solar optimiser
- May plan charging stops or coordinate charging with local generation and storage.