Solar and EV lab · Level 7 of 8
EV charger fault: a car will not charge
Level 7 of 8 in the Solar and EV lab: a free solar and EV exercise at Advanced level. A car is plugged in and nothing happens, or it charges far too slowly. Read the control pilot, the proximity pilot and the leakage, name the cause and make the right fix.
Free · no download. Your work is saved on this device. Updated 18 Oct 2026.
The brief
- Client
- Westgate Retail Park
- Site
- Car park bay 4, Westgate Retail Park
- Work order
- WO-SEV-107
- Task code
- SEV-07
- Difficulty
- Advanced
- Type of work
- Fault-finding
A car is plugged in and nothing happens, or it charges far too slowly. Read the control pilot, the proximity pilot and the leakage, name the cause and make the right fix.
Skills you practise
- Control pilot states A to F
- PWM duty cycle
- Proximity pilot
- RCD and earth leakage
- Fault finding
What the test checks
The acceptance test marks the skills this level practises.
- Control pilot states A to F
- PWM duty cycle
- Proximity pilot
- RCD and earth leakage
- Fault finding
In this lab
- Strings, protection and the day's generation
- Battery rules under a tariff
- Charger faults and load management
Levels in the Solar and EV lab
Previous: Commission the system: the safe energising orderNext: Load management: three chargers on a limited supply
- Site survey: name every part and every isolation point
- String sizing for the coldest and hottest day
- Select cables, fuses, isolators and surge protectors
- Generation against load: size the array for self-consumption
- Battery dispatch: cut the bill under a time-of-use tariff
- Commission the system: the safe energising order
- EV charger fault: a car will not charge
- Load management: three chargers on a limited supply
Part of the Solar and EV lab
Size a solar array, set a battery and fault-find an EV charger on a commercial site.
Feeds these internships: Electrical Design, Electrical and Solar Energy Systems.