Calculate household demand, EV charging, PV yield and battery storage in one annual energy balance.
This calculator shows how EV charging changes PV use, storage demand, grid import and export.
Complete the inputs and calculate.
Assess how EV charging changes direct PV use, storage need and grid import.
Household load, distance and EV consumption, PV yield, battery size, efficiency and charging shares.
The vehicle adds a load that can be shifted in time. Daytime availability raises direct PV use; night-only charging needs storage or grid energy even when annual energy is unchanged.
Annual EV energy is added to household demand. PV serves direct load, storage shifts surplus, and the remainder is imported or exported.
Charging the car during daylight raises direct PV use more than charging exclusively at night.
Sources and limits: Simplified annual balance; model vehicle availability and hourly profiles separately for detailed design.
Assess how EV charging changes direct PV use, storage need and grid import.
Energy calculators balance quantities over time and separate useful energy, losses and grid import. This matters because power is instantaneous while energy is its time integral.
Annual EV energy is added to household demand. PV serves direct load, storage shifts surplus, and the remainder is imported or exported.
Household load, distance and EV consumption, PV yield, battery size, efficiency and charging shares. The vehicle adds a load that can be shifted in time. Daytime availability raises direct PV use; night-only charging needs storage or grid energy even when annual energy is unchanged.
Enter household load, annual distance and EV consumption, PV yield, battery size, efficiency and the share of daytime charging. The calculator balances how much of total load (household plus vehicle) is covered directly from PV, from storage or from the grid.
Charging the car during daylight raises direct PV use more than charging exclusively at night.
The vehicle adds a load that can be shifted in time. Daytime availability raises direct PV use; night-only charging needs storage or grid energy even when annual energy is unchanged. An annual value describes a scenario, not a guarantee for every day. Efficiency, coincidence, temperature, driving profile and tariff assumptions can change practical results more than rounding.
Energy in kWh per year, storage size in kWh, shares in percent.
Estimating how much an additional EV changes a household's PV self-consumption, storage need and grid import, or comparing daytime versus nighttime charging for PV use.
Simplified annual balance; model vehicle availability and hourly profiles separately for detailed design.
Common mistake: Don't underestimate the daytime-charging share – exclusively nighttime charging can barely use PV surplus directly and depends almost entirely on grid power or battery storage. Don't mix EV annual energy with household load without viewing both shares separately in the result; different load profiles lead to different PV coverage.
PV generates only during the day; a vehicle charging during generation hours can use surplus energy directly, while nighttime charging inevitably relies on storage or the grid.
A larger battery can shift more PV surplus in time, covering a larger share of both household and vehicle load from PV instead of the grid, up to the point where available surplus is exhausted.
It shows the general order of magnitude. For a robust decision, vehicle availability, hourly charging and generation profiles and seasonal variation should additionally be simulated.
Annual EV energy is calculated from distance and driving consumption. Direct PV use and a battery then cover part of combined household and vehicle demand.
Vehicle availability, charging power, seasonal generation and the actual charging schedule can materially change the annual balance.
Inputs, units and assumptions remain traceable in the result. Planning and approval require measured data, manufacturer documentation and a time-series simulation.