Pure EV Charging Infrastructure Lead Interview: Rounds, Questions and Preparation

What the job involves

A Charging Infrastructure Lead plans, deploys, and maintains EV charging networks for two-wheelers and small electric vehicles. The role involves site surveys, vendor coordination, electrical safety compliance, and uptime monitoring across cities or campuses. You will work at the intersection of electrical engineering, operations, and customer experience to ensure reliable charging access.

Role and Technical Knowledge

1. 1

   What is the difference between AC and DC charging for electric two-wheelers, and which would you deploy for a residential society?

   Explain that AC charging is slower and cheaper, suitable for overnight parking, while DC fast charging is for quick top-ups. For a residential society, AC is preferred due to lower cost and simpler infrastructure.

2. 2

   How do you calculate the electrical load required for a charging station with five 3.3 kW chargers?

   Multiply number of chargers by power rating (5 x 3.3 kW = 16.5 kW), then apply a diversity factor (e.g., 0.8) to get actual load. Mention need for transformer capacity and cable sizing.

3. 3

   What safety standards apply to EV charging installations in India?

   Reference IS 17017 series for conductive charging systems, CEA regulations for safety, and local electricity board rules. Mention earthing, RCDs, and IP-rated enclosures.

4. 4

   What is the role of a Battery Management System (BMS) during charging?

   BMS monitors cell voltage, temperature, and state of charge, communicates with charger to prevent overcharging, and balances cells. It ensures safety and battery longevity.

Practical Scenarios

1. 5

   A charging station in a busy market area has 40% downtime due to power fluctuations. How would you diagnose and fix this?

   Start with site power audit, check for voltage stabilizers or surge protectors, review charger logs, and coordinate with local electrician. Suggest installing AVR or UPS for critical components.

2. 6

   You need to deploy 10 charging points across a college campus with limited budget. What is your approach?

   Prioritize high-traffic locations, use AC slow chargers, negotiate bulk vendor pricing, and phase deployment. Consider shared charging with existing parking infrastructure.

3. 7

   How would you estimate the cost per charging session for a 2 kWh battery at a commercial tariff of Rs 10 per unit?

   Calculate energy cost: 2 kWh x Rs 10 = Rs 20. Add overheads like maintenance, rent, and margin (e.g., 30%). Final price could be around Rs 30-35 per session.

4. 8

   A vendor delays installation by two weeks. How do you handle it while keeping the client informed?

   Communicate proactively with client about delay, escalate to vendor management, and propose interim solutions like temporary charging. Document penalties as per contract.

Behavioural and Situational

1. 9

   Tell me about a time you had to coordinate with multiple people to complete a project. What was your role?

   Use STAR method: describe situation, task, action (e.g., scheduling, follow-ups), and result. Highlight communication and problem-solving.

2. 10

   How would you handle a customer who is angry about a charging station not working?

   Show empathy, apologize, and quickly gather details. Offer immediate troubleshooting or alternative station, and follow up after resolution. Emphasize customer satisfaction.

3. 11

   Describe a situation where you had to learn a new technical concept quickly. How did you do it?

   Pick a relevant example like learning about charging protocols. Explain your method: online research, asking experts, hands-on practice. Show eagerness to learn.

4. 12

   Why do you want to work in EV charging infrastructure, and how does this role fit your career goals?

   Connect personal interest in clean energy and electric mobility. Mention desire to build scalable infrastructure and grow with the EV sector in India.

HR and Company Fit

1. 13

   Are you willing to travel frequently to different sites for deployment and maintenance?

   Answer honestly but positively. If yes, mention adaptability. If no, clarify constraints and suggest alternative ways to contribute.

2. 14

   What do you know about our company's charging network or EV products?

   Research the company's website, recent news, and product lineup. Mention specific models or initiatives to show genuine interest.

3. 15

   How do you prioritize tasks when you have multiple deadlines, such as site surveys and vendor meetings?

   Use urgency and impact matrix. Explain how you would communicate with stakeholders and adjust schedules. Give an example from college projects.

4. 16

   What are your salary expectations for this role?

   Research industry standards for freshers in EV infrastructure. Give a range based on company size and location, and express flexibility.