Useful answers from your own numbers.
Compare EV charging, solar, batteries and household energy with transparent formulas built around European units.
Energy calculators
Choose a tool and adjust the assumptions to match your situation.
EV Charging Cost
Calculate a charging session, range added and cost per 100 km or miles.
Open calculator →EVEV vs Petrol or Diesel Cost
Compare annual EV electricity costs with petrol or diesel.
Open calculator →EVEV Charging Time
Estimate AC or DC charging duration from average power.
Open calculator →BatteryHome Battery Runtime
Estimate how long a home battery can support essential loads.
Open calculator →BatteryPower Station Runtime
Estimate runtime for fridges, laptops, pumps and other appliances.
Open calculator →SolarSolar Payback
Estimate annual solar value and simple payback.
Open calculator →HomeAppliance Energy Cost
Calculate monthly and annual electricity use for any appliance.
Open calculator →HomeHeat Pump vs Gas Cost
Compare annual heat-pump electricity with gas heating.
Open calculator →HomeThree-Phase Power
Convert amps to kW for 230/400 V electrical supplies.
Open calculator →BatteryBackup Battery Size
Size a battery for a desired outage duration.
Open calculator →EVEV Trip Energy and Cost
Plan trip energy, charging cost and approximate stops.
Open calculator →EVEV Winter Range
Estimate cold-weather range from consumption and usable charge.
Open calculator →EVHome EV Charger Size
Compare 3.7, 7.4, 11 and 22 kW home charging.
Open calculator →SolarSolar Battery Size
Estimate useful home-battery capacity from evening demand.
Open calculator →EVTime-of-Use EV Charging
Compare day and night charging tariffs.
Open calculator →BatteryEV V2L Backup Runtime
Estimate how long an EV can power essential appliances.
Open calculator →Practical energy guides
Understand the inputs before making a decision.
kW, kWh and amps: the practical difference
A practical guide to power, energy and current for home electricity and EV charging.
Practical guideHow to choose realistic EV consumption
Use real driving data instead of relying on one official efficiency number.
Practical guideHome battery sizing without guesswork
Turn measured household demand into a practical battery-capacity estimate.
Check your charging bill
A worked charging-bill audit with measurement boundaries, fees, mixed tariffs and a reusable recording checklist.
Audit an EV charging bill: from battery percentage to cost per kilometre →IONIQ 5 owner observations: build a trip energy reserve
Compare two reported consumption observations with your own route, usable capacity and charge reserve. Export a calculation record.
Compare energy budgets →