How Public Parking Garages Can Build Low-Cost EV Charging With AC Solutions

As EV adoption accelerates, public parking garages are becoming one of the most important charging scenarios.

However, many operators face a key challenge:

How to deploy EV charging without high upfront investment?

The answer for most facilities is clear:

Use AC charging to build a scalable, low-cost charging network

Why AC Charging Is Ideal for Public Garages

Compared with DC fast charging, AC charging offers significant advantages for parking scenarios.

EV charging overview:
https://en.wikipedia.org/wiki/Charging_station

Factor	AC Charging	DC Fast Charging
Installation cost	Low	High
Power requirement	7–22 kW	60–350 kW
Infrastructure upgrade	Minimal	Significant
Suitable duration	1–8 hours	15–60 minutes

Public parking garages typically have long dwell times, making AC charging the optimal solution.

The Core Idea: Low-Cost Retrofit Instead of Full Upgrade

Instead of rebuilding electrical infrastructure, operators can:

retrofit existing parking facilities with AC chargers

This approach minimizes:

• electrical upgrades
• installation complexity
• downtime

Step 1: Assess Existing Electrical Capacity

Before deployment, evaluate available power.

Electric power distribution overview:
https://en.wikipedia.org/wiki/Electric_power_distribution

Check:

• transformer capacity
• panel load
• spare circuits

Example:

Total Capacity	Current Load	Available Capacity
100 kW	70 kW	30 kW

Even limited capacity can support multiple AC chargers with proper management.

Step 2: Use Load Management to Maximize Capacity

Load management overview:
https://en.wikipedia.org/wiki/Load_management

Dynamic load management allows:

• multiple chargers to share limited power
• automatic power distribution
• avoidance of grid overload

Example:

Chargers Installed	Available Power	Avg Power per Charger
4	40 kW	10 kW
8	40 kW	5 kW

This enables more charging points without upgrading the grid

Step 3: Deploy Wall-Mounted AC Chargers

Wall-mounted AC chargers are ideal for garages because they:

• save space
• reduce installation cost
• simplify wiring

Typical configuration:

• 7 kW (residential/light use)
• 11–22 kW (commercial/public use)

Step 4: Prioritize High-Utilization Zones

Not all parking spaces need chargers initially.

Focus on:

• high-traffic areas
• long-duration parking spots
• easy-to-access locations

Start small and scale based on usage.

Step 5: Implement Smart Charging Systems

Smart charging overview:
https://en.wikipedia.org/wiki/Smart_charging

Smart systems enable:

• user authentication
• billing and payment
• remote monitoring
• energy optimization

This transforms chargers into revenue-generating assets.

Cost Comparison: AC Retrofit vs DC Installation

Item	AC Retrofit	DC Fast Charging
Equipment cost	Low	Very high
Installation complexity	Low	High
Grid upgrade	Rare	Often required
ROI period	Short	Long

For most parking garages, AC offers the fastest return on investment

Revenue Opportunities for Parking Operators

AC charging enables:

• pay-per-use charging
• subscription models
• parking + charging bundles

As EV adoption grows:

charging becomes an additional revenue stream.

Real-World Use Cases

Public parking garages using AC charging:

• shopping malls
• office parking structures
• municipal parking facilities
• airport parking

These locations benefit from:

• predictable dwell time
• scalable deployment
• lower operational costs

Common Mistakes to Avoid

• overbuilding infrastructure too early
• ignoring load management
• installing chargers in low-usage areas
• underestimating future demand

Why This Strategy Works in 2026

With rising EV adoption:

• demand for public charging is increasing
• grid capacity remains limited
• cost control is critical

AC charging provides the best balance between:

• cost
• scalability
• practicality

About QIAO

QIAO provides cost-effective AC EV charging solutions designed for public and commercial environments.

Our solutions support:

• dynamic load management
• wall-mounted space-saving design
• OCPP-based smart charging
• scalable deployment for parking facilities

QIAO helps parking operators build low-cost, high-efficiency charging networks.

FAQ

Is AC charging enough for public parking garages?
Yes, especially for long parking durations.

Do I need to upgrade my electrical system?
Not always. Load management can maximize existing capacity.

How many chargers should I install initially?
Start with high-demand areas and expand gradually.

Is AC charging profitable?
Yes, with proper pricing and utilization.