AGVs and AMRs Aren't the Same Thing

People use "AGV" and "AMR" interchangeably, and it drives automation engineers nuts. They're fundamentally different technologies with different use cases, cost profiles, and infrastructure requirements.

Automated guided vehicles (AGVs) follow fixed paths — magnetic tape, painted lines, or embedded wires in the floor. They've been around since the 1950s, and they're still the workhorse of high-volume, predictable material transport. Think automotive plants running the same route between a stamping press and a weld cell 500 times a shift. AGVs from companies like Dematic and JBT handle payloads up to 60 tons for heavy manufacturing. They're simple, reliable, and relatively cheap per unit.

Autonomous mobile robots (AMRs) use SLAM (simultaneous localization and mapping), LiDAR, and camera-based navigation to move freely. No fixed infrastructure needed — just map the facility and go. OTTO Motors, MiR (now part of Teradyne), and Locus Robotics are the big names here. AMRs typically handle 100–1,500 kg payloads, though some models push to 4,500 kg.

Here's the thing: most warehouses don't need one or the other. They need both. AGVs for the high-volume trunk routes. AMRs for the flexible last-mile delivery to workstations.

The navigation system you choose determines your facility's long-term flexibility. And once you've committed, switching is expensive.

Magnetic tape guidance (AGV) costs about $5–$10 per linear foot to install. It's bulletproof in terms of reliability — 99.9%+ route adherence. But every time you rearrange the floor, someone's on their hands and knees pulling up old tape and laying new strips. In a facility that reconfigures quarterly, that adds up fast.

LiDAR-based SLAM (AMR) requires no floor modifications. The robot builds a map of fixed reference points — walls, columns, rack ends — and localizes in real time. Modern SLAM systems from vendors like SICK and Velodyne achieve ±10mm repeatability in structured environments. But throw in a warehouse where pallets constantly move and reference geometry changes daily, and accuracy can drop.

Natural feature navigation combines cameras and LiDAR with AI-based object recognition. It's the newest approach, and companies like 6 River Systems use it effectively. But it requires more compute power on-board, which drives up unit cost by 15–25%.

The practical advice? If your facility layout changes less than twice a year and routes are predictable, AGVs with magnetic tape will give you the best cost-per-move. If you're running a mixed-SKU operation with frequent layout changes, AMRs pay for themselves in flexibility.

Fleet Management and MES Integration

A single AGV or AMR is a novelty. A fleet of 20+ is a logistics system — and it needs to be managed as one.

Fleet management software is where the real value lives. Platforms like OTTO Fleet Manager, MiR Fleet, or third-party solutions like InOrbit handle traffic management, job dispatching, charging schedules, and deadlock prevention. Without proper fleet orchestration, you'll get robots blocking each other in intersections. We've seen poorly managed fleets drop throughput by 30% compared to what the same robots achieve with optimized dispatching.

The critical integration point is your MES (manufacturing execution system) or WMS (warehouse management system). The fleet manager needs to receive transport orders directly from MES — "move pallet A from station 12 to dock 3" — without human intervention. Most modern AGV/AMR platforms support REST APIs and OPC-UA for this. But legacy MES systems sometimes need middleware, and that's where consulting with an integrator saves months of troubleshooting.

Here's a number worth remembering: a well-integrated AMR fleet handling material transport typically achieves 85–92% utilization during peak shifts. Poorly integrated fleets? 40–55%. Same hardware, massive difference in output.

Payload, Speed, and Throughput Benchmarks

Let's talk real numbers, because vendor spec sheets are best-case scenarios.

Typical AGV throughput: A tugger-style AGV pulling a train of carts can move 4–6 pallets per trip at 1.2 m/s (about 2.7 mph). On a 200-meter route, that's roughly 15 round trips per hour, or 60–90 pallets/hour per vehicle. Multiply by fleet size, subtract 10–15% for charging and traffic, and you've got your planning number.

Typical AMR throughput: A unit-load AMR carrying a single pallet or bin moves at 1.5–2.0 m/s unloaded, 1.0–1.5 m/s loaded. In a typical 10,000 sq ft fulfillment zone, one AMR handles 20–30 picks per hour with goods-to-person workflows. Locus Robotics reports 2–3x productivity improvement versus manual cart picking.

Payload ranges by type: - Light-duty AMRs (MiR250, OTTO 100): 100–250 kg - Mid-range (MiR600, OTTO 750): 250–750 kg - Heavy-duty AGVs (Dematic, Elettric80): 1,000–60,000 kg - Tugger AGVs: pull capacity up to 5,000 kg (train of carts)

One thing vendors won't tell you: actual throughput drops 20–30% once you account for real-world conditions — narrow aisles, pedestrian traffic, charging downtime, and edge cases where the robot stops because it detects an obstacle it can't route around. Plan for that.

Making the Business Case

The ROI calculation for mobile robots is more straightforward than most automation projects because you're replacing a clear cost: forklift operators, tugger drivers, or manual cart pushers.

A single forklift operator costs $55,000–$75,000/year fully loaded (salary, benefits, training, insurance). An AMR costs $30,000–$100,000 depending on payload class, plus roughly $5,000–$8,000/year in maintenance and software licenses. At two-shift operation, one AMR replaces 1.5–2 FTEs (it doesn't take breaks, but it does charge). That's a 14–22 month payback for most deployments.

But the hidden savings are bigger. Forklift incidents cost manufacturers an average of $38,000 per accident (OSHA data). AMRs with safety-rated LiDAR essentially eliminate pedestrian collision risk. Insurance carriers are starting to offer premium reductions for facilities that replace forklifts with mobile robots on main thoroughfares.

If you're evaluating AGVs or AMRs for your facility, talk to our team — we've integrated fleets across automotive, electronics, and consumer goods warehouses and can help you size the system correctly.