Best AMR for Moving Materials in a Mid-Size Warehouse

Which AMR is best for moving materials in a mid-size warehouse?

The best AMR for a mid-size warehouse is the one that matches what you move, how far it travels and how much aisle you have, not a model that tops a list. Service Robot Co. compares AMRs across manufacturers after a site assessment, then leases, deploys and services the one that fits your routes.

Makers build for different jobs. Some robots follow pickers with a tote or cart, some carry pallets, some lift whole shelves, and some feed conveyors. Their published payloads span from 80 lb to 1,350 kg, so picking by brand before picking by job is the common mistake.

This guide walks through the choices in the order we use them: the load, the aisle, the route, the charging, the software and the fleet size. Figures come from manufacturers' own sheets, and we use them as examples of a range rather than a contest.

What are you moving: totes, carts, pallets or shelves?

Load class decides the robot family. Locus lists its Origin collaborative picking robot at an 80 lb (36 kg) payload for in-aisle picking beside people. Its Vector lists 600 lb (272 kg) for cart and shelf transport, case movement, sortation and conveyor feeding. Mobile Industrial Robots lists a range from the MiR250 at 250 kg to the MiR1350 at 1,350 kg, and a MiR1200 Pallet Jack at 1,200 kg for EPAL pallets. Geek+ lists its P800R shelf-moving robot at 1,000 kg and 2 m/s.

Those are four different jobs. A picking assistant cuts walking time. A tote or cart robot replaces a tugger or a person pushing a cart. A pallet robot replaces a pallet jack and a driver on repeat runs. A shelf robot brings inventory to a station. The table below sets the four side by side.

Weigh your heaviest regular load, not your average. An AMR rated for 600 lb that sometimes meets a 900 lb pallet is overloaded on those trips, so size for the heavy case.

How wide do your aisles and turns need to be?

Corridor width is a published number, and it moves with speed. For a pallet AMR such as the MiR1200 Pallet Jack, Mobile Industrial Robots lists an operational corridor of 2.10 m (about 6.9 ft) at full speed and 1.55 m (about 5.1 ft) at reduced speed with an EPAL 1 pallet. A 90 degree turn needs 1.90 m, a U-turn 1.95 m, pivoting 2.75 m and a doorway 1.40 m.

Two robots passing need more. The same sheet lists 3.80 m (about 12.5 ft) at full speed and 2.90 m (about 9.5 ft) at reduced speed. In a mid-size warehouse that decides if you run one lane in both directions with traffic rules, or one-way routes. The feet conversions are ours.

Speed and sound matter when people share the aisle. The same sheet lists a top speed of 1.5 m/s (5.4 km/h) at maximum payload and a maximum noise level of 77.3 dB. Mobile traffic in a mid-size building means rules: one-way lanes where two robots cannot pass, slow zones near pedestrian crossings and a plan for where forklifts and robots meet.

The pickup point needs room as well. The sheet lists at least 3.5 m in front of floor pallets when the robot approaches from the front, and 2.7 m from the side. Measure those spaces where your pallets actually sit, not where the drawing says they should.

How far, how often and how fast does the robot need to go?

Sizing starts with trips per hour at your busiest time. Cycle time is travel plus handling. Mobile Industrial Robots lists 1.5 m/s as the top speed of the MiR1200 Pallet Jack at maximum payload on a flat surface, and up to 40 seconds to pick up and 30 seconds to place a pallet from the front entry position.

Here is an illustration with a distance you should replace with your own. A 200 m run at 1.5 m/s takes about 133 seconds each way. A loaded trip out, an empty trip back and 70 seconds of handling comes to roughly 337 seconds, or a little under 11 trips an hour per robot before traffic and charging. That is our arithmetic on published figures.

Daifuku, a materials handling maker, notes that there is a limit to how much volume can be delivered to a specific point. Where many robots converge on one drop-off, the drop-off becomes the bottleneck, not the robot count.

How do charging and battery life shape the shift?

Charging is part of the route. The MiR1200 sheet lists lithium-ion batteries rated for 3,000 full charging cycles before capacity falls below 80 percent, a design life of 5 years or 20,000 hours of active operation, and docking time of up to 18 seconds. It also lists at least 4.00 m of clear space in front of a single charging station and 4.60 m in front of a line of stations.

Those numbers say where docks can go. A charging row needs its own aisle, and a dock in a forklift lane is a collision waiting to happen. Daifuku says AMR batteries need replacing around the five-year mark, so plan the refresh into the term of your lease.

Ask each maker how the robot decides when to charge, if it tops up between jobs and what happens when every robot wants the dock at once. A fleet that charges together stops together.

How does an AMR connect to your warehouse software and your people?

Software is where projects slip. In MHI's 2025 survey of more than 700 supply chain leaders, 75 percent viewed supply chain synchronization and coordination as somewhat challenging, and more than 25 percent as very or extremely challenging. An AMR that cannot take orders from your warehouse system is just a cart that drives itself, with nobody to tell it where to go.

Ask what the robot needs from your system and what it sends back: task requests, status, location and exceptions. Locus says its tablet-based workflows let associates become productive in minutes, which tells you the people side can be quick when the system side is settled.

Safety belongs in the plan too. ANSI/A3 R15.08 covers industrial mobile robots in three parts. Part 2 puts the risk assessment on the integrator, in line with ANSI/ISO 12100 or ANSI B11.0, and The Robot Report says US users must insist on compliance from their integration partners. Type B robots under the standard carry attachments such as roller tables, conveyors and linear lifts, so ask which type you are getting and who has assessed it.

What do market signals say for a mid-size site?

Demand is real and the pace is uneven. OTTO Motors reports that MHI's 2025 survey expects adoption of automation technologies such as AS/RS, automated vehicles and robotics to reach 83 percent by 2030, and The SC Exchange reports that 45 percent of respondents plan to acquire automation equipment within three years. Interact Analysis trimmed its five-year growth forecast for AMRs from 26 percent to 21 percent in July 2025 and said the industry is still growing, but not as fast or as smoothly as once expected.

For a mid-size site the useful lesson is to start narrow. Daifuku says an AMR system can begin with a single robot at a lower entry cost than fixed conveyors, which suits smaller operations, and also says some AMR features are still being proven. Pick one route with a clear payoff, run it for a few weeks, and add robots once the numbers hold.

How does Service Robot Co. choose an AMR for your warehouse?

We start with what you move and where. We map your routes and distances, measure aisles and turns, list your loads and peak trips per hour, and check what your warehouse software can send. Then we compare AMRs across manufacturers and recommend the one that fits, sized for one route first.

We lease the robots on a 3-year lease with a $1 buyout at the end, deploy them, integrate them with your systems, train your crew and service them. We do not name a brand before the assessment.

Want help picking the right robot? Talk to us

Book a free site assessment with Service Robot Co. Bring your floor plan, your heaviest regular load and the routes you want to automate, and we will show you what fits.

Every robot we lease comes with 24/7 support with 10-minute specialist triage, regional service engineers in every serviced state, three check visits a year and a 12-month warranty.