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EV Charging from Solar
Time to charge an EV battery from a solar array.
DesignCore inputs only — quick sizing with engineering defaults.
Inputs (SI units)
Results
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Engineering Formula
- E_needed = Cap / η
- Time = E_needed / P_solar
Assumes constant PV output over the charging window. Real charging follows a CC-CV curve; add 10–15% margin.
Step-by-step Calculation
- 1.Energy needed
Cap/η33.33 kWh - 2.Time
E/P11.11 h
Design Assumptions
- • Battery from 0% to 100%.
- • Steady insolation.
Engineering Tips
- ◆Charge during 10:00–14:00 for best solar match.
- ◆V2G-ready cars can time-shift surplus.
Warnings
- ▲Below 1.4 kW output most EV BMS won't accept a session.
Standards & References
IEC 61851 (EV supply)OCPP 2.0
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