Interview Questions › Product Design

Design a smart home energy management dashboard for homeowners

Design a mobile smart energy management and automation dashboard for homeowners with rooftop solar panels, home battery storage, EV chargers, and smart appliances.

Context

Homeowners are overwhelmed by volatile time-of-use electricity pricing, complex solar net metering, and disconnected smart device apps, missing out on hundreds of dollars in energy savings.

Clarifying questions to ask first

• Does the app integrate across multiple hardware brands (Enphase, Tesla, SolarEdge) or proprietary ecosystem? (Universal standard).
• Can the system sell stored power back to the grid during peak pricing? (Yes, Virtual Power Plant participation).

How to approach it

1. Understand Homeowner Goals: Minimize monthly utility bill, maximize solar self-consumption, maintain backup battery power for storm outages, track carbon footprint reduction
2. Design Comprehensive Energy Operating System:
3. 1. Real-Time Energy Flow Visualizer (Live animated diagram showing Solar Generation -> Battery Storage -> Home Usage -> Grid Feed-in)
4. 2. AI "Cost-Optimized Auto-Scheduler" (Automatically runs dishwasher and charges EV at 2:00 AM when grid power is cheapest or solar is peaking)
5. 3. "Storm Watch Outage Shield" (Auto-detects severe weather warnings and charges home battery to 100% before storms hit)
6. 4. Dollar Savings & Grid Arbitrage Tracker (Visualizes exactly how much money solar and battery stored/saved this month)

Framework: Home Energy Ecosystem -> User Mental Model & Bill Confusion -> Real-Time Energy Flow Architecture -> Automated AI Optimization Engine -> Savings & Impact Metrics

Sample answer

• Homeowners do not want to constantly monitor kilowatt-hours; they want set-and-forget automation that automatically minimizes their electricity bill
• Showing live dollar savings creates ongoing daily engagement with clean energy

1. MVP: Live energy flow diagram, AI smart appliance/EV auto-charging scheduler, storm backup trigger, and monthly financial savings report card

Executive design: A smart home energy operating system that visualizes real-time power flows and automates battery/EV charging around time-of-use utility rates to maximize dollar savings.

What interviewers look for

• Real-Time Multi-Source Energy Flow UX
• Automated Tariff Arbitrage Optimization (EV/Appliances)
• Storm Outage Resilience Logic
• Dollar Savings Financial Quantification