Stacker AGV Buying Guide: How to Pick the Right Automated Picking Robot for Your Warehouse
This guide walks through the key specifications, comparison data, and selection criteria for stacker AGVs designed for automated storage and retrieval. Learn how load capacity, lift height, navigation technology, and battery life affect your purchasing decision.
What Is a Stacker AGV?
A stacker AGV (Automated Guided Vehicle) is a mobile robot specialized in lifting, transporting, and stacking unit loads such as pallets, totes, or bins. Unlike ordinary transfer AGVs, stacker AGVs are equipped with a mast and forks, enabling them to interface directly with shelving, racking, or floor storage. They are widely used in warehousing, distribution centers, and manufacturing for automated goods retrieval and replenishment.
Core Specifications to Evaluate
When purchasing a stacker AGV, the following parameters directly affect productivity, ROI, and facility compatibility.
| Parameter | Typical Range | Why It Matters |
|---|---|---|
| Rated Load Capacity | 500 kg – 2,000 kg | Determines the maximum weight per handling cycle; must match your pallet or product weight. |
| Lifting Height | 1.5 m – 10 m | Defines top shelf reach; choose based on racking height and clearance. |
| Lifting Speed (loaded/unloaded) | 0.1 – 0.4 m/s | Impacts cycle time; faster speeds improve throughput but increase energy consumption. |
| Driving Speed (max) | 0.5 – 2.0 m/s | Influences travel time between stations; higher speeds require wider aisles. |
| Navigation Type | Laser SLAM, Natural SLAM, Magnetic tape, QR code | Determines flexibility of path changes and installation cost. SLAM offers zero infrastructure change. |
| Battery & Charging | Lithium NMC/LFP, 24V/48V, automatic opportunity charging | Affects uptime; opportunity charging (e.g., 15 min per hour) allows 24/7 operation without manual intervention. |
| Minimum Aisle Width | 1.5 m – 2.2 m | Rear-steer or fork-facing designs need different aisle widths; critical for retrofitting existing warehouses. |
| Safety System | LIDAR, 3D camera, bumpers, emergency stop, sound/light alarms | ENS ISO 3691-4 compliance required for human-robot coexistence. |
| Payload Interface | Forks, roller deck, or custom gripper | Standard forks for pallets; roller decks for tote transfer; custom for unique packaging. |
Common Stacker AGV Models Comparison
The table below compares three typical stacker AGV configurations available in the market today. Use it as a starting point to shortlist models that fit your operational envelope.
| Model Example | Load Capacity (kg) | Max Lift Height (m) | Navigation | Battery Type | Min. Aisle (m) |
|---|---|---|---|---|---|
| Light-duty stacker (e.g., for small totes) | 500 | 3.0 | Laser SLAM | Lithium 24V | 1.5 |
| Medium-duty pallet stacker | 1,000 – 1,500 | 6.0 | Natural SLAM + QR reflectors | Lithium 48V | 1.8 |
| Heavy-duty long-reach stacker | 2,000 | 10.0 | Multi-sensor fusion (Laser + Vision) | Lithium LFP, opportunity charge | 2.2 |
How to Choose the Right Stacker AGV
1. Match Load and Lift to Your Racking Profile
Start by measuring the heaviest pallet you handle and the maximum rack height. Never select a unit that can only barely lift the heaviest load—allow a 20% safety margin. Also verify that the forks can accommodate your pallet entry (stringer or block type).
2. Evaluate Navigation Flexibility
If your warehouse layout changes frequently, choose SLAM-based navigation (Laser SLAM or Natural SLAM). They require no tape or reflectors, reducing reconfiguration cost. For stable layouts with fixed paths, magnetic tape or QR codes offer lower initial cost and are easier to debug.
3. Plan for Battery Life and Charging Strategy
Lithium batteries with automatic opportunity charging give you the greatest uptime. Ask the supplier for a mission profile simulation: can the AGV operate 20 hours per day with 15-minute charging breaks? If not, consider swapping batteries or increasing the fleet size.
4. Check Aisle Width and Turning Radius
Stacker AGVs with rear-steer (i.e., steering wheels at the back) generally need wider aisles for right-angle stacking. Front-steer or omnidirectional designs can work in tighter corridors. Always request a turning circle diagram before confirming the purchase.
5. Safety and Compliance
Ensure the AGV meets ISO 3691-4 (industrial trucks – safety requirements for driverless trucks). Look for redundant safety LIDAR, emergency stop buttons on both sides, and audible/visual alarms. If your environment includes narrow aisles with pedestrian access, ask about collision avoidance algorithms.
6. Fleet Management and Software Integration
Ask about the supplier’s fleet management system (FMS). Can it integrate with your WMS or ERP via REST API or TCP/IP? Good FMS should provide real-time status, traffic control at intersections, and automatic recharging scheduling.
Conclusion
Choosing the right stacker AGV is a decision that balances load, lift, speed, navigation, and energy. By carefully mapping your material flow and racking parameters against the specifications in this guide, you can select a system that reduces labor cost, improves storage density, and offers a clear ROI within 12-24 months. Always request on-site test runs and a detailed service agreement before finalizing your purchase.