APPLIANCE ENERGY COST — AI URL GUIDE

Tool: https://www.lejnel.com/tools/
Query parameter: energy

LINK CREATION
Serialize the state as compact JSON and percent-encode it ONCE as the named query parameter. Do not use Base64. JavaScript: encodeURIComponent(JSON.stringify(state)); Python: urllib.parse.quote(json.dumps(state,separators=(',',':')),safe=''). Encode Unicode, &, #, +, % and other reserved characters. Return a clickable URL and summarize inputs and assumptions. Ask about missing inputs; do not invent measurements or product requirements. All JSON numbers must be finite, with decimal points and no unit suffixes.

SAVING
The complete URL stores the inputs, not a server-side account record. Open the link and check every input. Bookmark or copy the updated URL after edits to retain that version. Anyone with the link can read its contents; avoid personal data. Results are recalculated on reopening and may change with future tool improvements. Print a fixed record when necessary.

STATE EXAMPLE (illustrative only)
{
  "watts": 1500,
  "hours": 2,
  "days": 30,
  "price": 2.5
}

FIELDS AND LIMITATIONS
All four numeric fields are required.
watts: appliance power, 0–1000000 W. Convert kW ×1000 first.
hours: hours of use per day, 0–24. Convert minutes /60.
days: whole number of days, 1–366.
price: electricity price PER kWh, 0–1000000 in the user's chosen currency. Convert pence/cents/øre to base currency if applicable and explain the conversion. Do not assume currency or obtain a current tariff without the user's rate.
Formula kWh=watts/1000 ×hours ×days; cost=kWh ×price. Assumes constant average power while used; excludes standing charges and varying time-of-use tariffs.
Append #energy-cost to the URL to open/scroll to this calculator. The directory can preserve both energy and payments parameters in one URL if both estimates are needed. Keep each decoded parameter under 2000 characters.

READY-TO-OPEN EXAMPLE
https://www.lejnel.com/tools/?energy=%7B%22watts%22%3A1500%2C%22hours%22%3A2%2C%22days%22%3A30%2C%22price%22%3A2.5%7D#energy-cost