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Solar EV Charging Calculator

Estimate how much EV charging energy can come from PV surplus. The calculator does not ask for a solar charging share; it derives it from mileage, EV consumption, PV yield, household demand and charging pattern.

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The solar EV charging calculator shows how much charging energy can come from PV surplus and how much still comes from grid or public charging.

Display currencyChoose the currency symbol for entered amounts and results. No exchange-rate conversion is applied.
UnitsChoose metric, US or UK units for distance, area, volume and car consumption.
Estimate this from your driving pattern. It determines yearly EV electricity demand.
Use a realistic value including charging losses. Many EVs are roughly between 15 and 22 mi/kWh.
Estimate how much of your charging happens at home rather than publicly or at work.
Choose how often the car can typically charge at home while PV is producing. The solar charging share is estimated from this.
If unknown: PV size in kWp × roughly 900–1,000 kWh/kWp/year as a first estimate.
Household use is considered first. Only PV surplus can be available for EV charging in this model.
Optional: the battery first reduces household grid import, so less PV surplus may remain directly for the car.
This price determines the value of each kWh charged from solar instead of grid power.
The solar charging advantage is roughly grid price minus the feed-in tariff you give up.
FAQ

Frequently asked questions

Can I charge my EV fully from solar?

In annual terms this is only likely if enough PV surplus is available and the car often charges at home during production hours.

Why does the calculator not ask for solar charging share?

Because that share is usually the result. The calculator estimates it from mileage, consumption, PV yield, household demand and charging pattern.

What is annual solar charging advantage?

It roughly estimates the value of using PV electricity in the car instead of grid electricity. Simplified: grid price minus feed-in tariff.

Is public charging included?

Charging not done at home is shown as external or public charging.

Does this replace wallbox planning?

No. Charging power, control, tariff, wallbox and vehicle behaviour must be checked separately.