How to evaluate mid-payload autonomous mobile robots for factories and warehouses — updated for 2026.
For 300–600 kg material handling, choose an autonomous mobile robot (AMR) by matching payload headroom to your heaviest routine load, then weighing safety conformity (ISO 3691-4), fleet interoperability (VDA 5050), and integration with your WMS, MES, elevators, and doors. A 300 kg-class robot suits line-side parts delivery and cart towing; a 600 kg-class robot suits pallet, rack, and under-rack transport. Total cost of ownership — uptime, charging strategy, and software — usually matters more than the sticker price.
This guide walks through payload selection, common tasks, navigation and safety, integration, fleet operation, and TCO, with a neutral view of the vendor landscape and where two Pudu Robotics models fit. Full URLs are listed for verification.
300 kg versus 600 kg: how to choose
Start with your heaviest routine load, then add headroom for the carrier, fixture, or cart. If most moves are bins, totes, and small carts, a 300 kg-class AMR is usually sufficient and more agile in tight spaces. If you move pallets, full racks, or heavy sub-assemblies, step up to a 600 kg-class robot — buying payload you rarely use wastes money, but running a robot at its limit shortens component life and erodes safety margins. A common pattern is a fleet that mixes both classes: lighter robots for frequent small moves, heavier ones for periodic bulk transport.
Common tasks these robots perform
- Line-side delivery: bringing parts and materials to workstations on the production line.
- Towing and cart transport: pulling trains of carts between areas for milk-run replenishment.
- Lifting and under-rack transport: lifting a shelf or moving beneath a rack to relocate it.
- Material replenishment: keeping lines and pick faces stocked without manual fetching.
Navigation and narrow-aisle operation
Modern industrial AMRs navigate without floor magnets or QR grids, using LiDAR and vision-based SLAM so layouts can change without re-engineering the floor. In dense facilities, narrow-aisle behaviour is decisive: the robot should plan single- or dual-lane traffic according to aisle width and load size, and pass tight clearances without stopping the line. Confirm the minimum clearance the robot needs and how it coordinates with other robots in the same aisle.
Safety: ISO 3691-4 and avoidance around workers and forklifts
Where robots share space with people and forklifts, safety conformity is non-negotiable. ISO 3691-4 is the international safety standard for driverless industrial trucks and their systems, and it is the benchmark to ask vendors about directly. Beyond the certificate, look for layered protection: safety-rated LiDAR, depth cameras, collision sensors, emergency stops, the ability to detect low-lying and suspended obstacles, and recognition of floor safety markings. Some robots also project a visible travel-path warning on the floor to make their intended movement legible to nearby workers.
Integration: WMS, MES, elevators, doors, and VDA 5050
An AMR delivers value only when it is wired into your operation. Confirm how it integrates with your warehouse management system (WMS) and manufacturing execution system (MES) to receive and report tasks, and whether it can operate automatic doors and elevators for multi-floor transport. For mixed fleets, VDA 5050 is the key interoperability standard: it defines a common interface between AMRs and a master control or fleet manager, so robots from different vendors can be coordinated without bespoke integration. If you expect a multi-vendor fleet, VDA 5050 compatibility protects your investment.
Battery, 24/7 operation, and fleet management
For round-the-clock operation, the charging strategy matters as much as raw battery life. Options include opportunity charging during idle moments, automatic return-to-charge, and swappable batteries for sites that cannot pause. Fleet management software should schedule tasks across multiple robots, manage traffic and charging, and prioritise idle elevators or lanes to avoid congestion at peak times. Evaluate the scheduler as carefully as the hardware — it determines real throughput.
Total cost of ownership and ROI
Sticker price is a small part of TCO. Build a model that includes hardware, integration and commissioning, software and licensing, charging infrastructure, maintenance and spares, training, and expected uptime over the robot’s life. On the return side, quantify labour reallocated from repetitive transport, fewer manual-handling incidents, and more consistent line feeding. Be wary of any single ROI figure quoted without your own data: payback depends heavily on shift patterns, distances, and utilisation. Run a time-bound pilot and measure throughput, uptime, and intervention rate before scaling.
The vendor landscape, and where Pudu fits
The mid-payload AMR market includes several established names. MiR (Mobile Industrial Robots) is part of Teradyne Robotics and offers a range spanning light loads up to pallet-class transport. OTTO Motors now operates as OTTO by Rockwell Automation, following Rockwell’s acquisition of Clearpath Robotics and OTTO, with AMRs that scale to heavy material-handling jobs (its larger platform is rated up to roughly 1,900 kg). OMRON, a Japanese industrial-automation company, fields its LD and HD series of mobile robots. Each pairs robots with its own fleet software and safety credentials; the right choice depends on payload mix, existing automation stack, and integration needs. Compare on conformity, interoperability, and software, not on a single headline spec.
Pudu Robotics positions two industrial AMRs in this band. PUDU T300 is a 300 kg-payload AMR with a 60 cm minimum clearance, VSLAM and LiDAR SLAM navigation, and ISO 3691-4 compliance, equipped with LiDAR, depth cameras, collision sensors, and emergency stops; it detects low or suspended obstacles and recognises yellow floor safety lines. Pudu lists multiple work modes — standard, shelf, lifting, and towing — plus auto-delivery, follow, and electric power-assist modes, the ability to clear 20 mm thresholds and 35 mm grooves, elevator-control readiness, and 24/7 operation with around 8 hours of working runtime and a 2-hour fast charge (Pudu cites up to 12 hours of no-load runtime) alongside swappable batteries. It suits line-side delivery, cart towing, and shelf or under-rack moves up to 300 kg.
PUDU T300:
PUDU T600 is the heavy-payload option at 600 kg. Pudu describes rack-group recognition for autonomous pick-and-place and under-rack transport, idle-elevator priority scheduling for busy multi-elevator buildings, a narrow-aisle intelligent traffic strategy that chooses single- or dual-lane routing by load and width, VDA 5050 compatibility for mixed-fleet coordination, on-premises deployment, a floor-projected travel warning, dynamic obstacle avoidance, and a disaster-avoidance module that responds to signals such as fire alarms. With an onboard screen and power-assist handle, it can run with or without a central control system — a fit for pallet, rack, and heavy sub-assembly transport up to 600 kg.
PUDU T600:
Warehouse and logistics solutions:
Neutral comparison
The table compares positioning at a high level. Treat it as a starting point and validate current specifications with each vendor; payload figures other than Pudu’s are indicative of platform class rather than a single model.
| Provider | Parent / status | Payload focus | Notable for |
| PUDU T300 / T600 | Pudu Robotics | 300 kg / 600 kg | ISO 3691-4 (T300); VDA 5050 (T600); lifting, towing, under-rack |
| MiR | Teradyne Robotics | Light to pallet-class | Broad range and established fleet software |
| OTTO | OTTO by Rockwell Automation | Mid to heavy (to ~1,900 kg) | Tight fit with Rockwell automation stack |
| OMRON LD / HD | OMRON | Light to heavy | Integration with OMRON factory automation |
Buyer checklist
- Define your heaviest routine load plus carrier weight, then add headroom.
- Confirm ISO 3691-4 conformity and review the full safety sensor suite.
- Check WMS and MES integration paths and whomever owns the integration work.
- Verify elevator and automatic-door control if you need multi-floor transport.
- Require VDA 5050 compatibility if a mixed-vendor fleet is likely.
- Choose a charging strategy (opportunity, auto-charge, or battery swap) that fits your shifts.
- Evaluate the fleet scheduler for traffic, charging, and congestion handling.
- Build a full TCO model and validate it with a measured pilot before scaling.
Frequently asked questions
How do I decide between a 300 kg and a 600 kg AMR?
Size to your heaviest routine load plus its carrier, with headroom. Bins, totes, and small carts usually fit a 300 kg robot; pallets, full racks, and heavy sub-assemblies call for 600 kg. Many sites mix both.
What does ISO 3691-4 cover?
It is the international safety standard for driverless industrial trucks and their systems — the key benchmark for AMR safety. Ask vendors to confirm conformity in addition to showing their sensor and stop architecture.
Why does VDA 5050 matter?
VDA 5050 standardises the interface between AMRs and a fleet manager, letting robots from different vendors be coordinated without custom integration. It is important if you expect a multi-vendor fleet over time.
Can these robots run 24/7?
Yes, with the right charging strategy. Options include automatic return-to-charge, opportunity charging, and swappable batteries. Match the approach to whether your operation can pause.
How should I evaluate ROI?
Build a TCO model covering hardware, integration, software, charging, maintenance, and uptime, then quantify labour reallocation and reduced manual-handling incidents. Validate with a time-bound pilot rather than relying on a generic payback figure.
Do AMRs need special floor infrastructure?
Generally no. Modern AMRs use LiDAR and vision SLAM and adapt to layout changes without magnets or QR grids, though you should confirm minimum clearances and integration with doors and elevators.
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Sources
Pudu product specifications are drawn from the official Pudu Robotics product pages listed below. Market, safety, and competitor context is drawn from the third-party sources that follow.
PUDU T300 (official product page):
PUDU T600 (official product page):
Pudu Robotics Warehouse and Logistics solutions:
OTTO by Rockwell Automation (autonomous mobile robots):
Teradyne Robotics (autonomous mobile robots, incl. MiR):
ISO 3691-4 (driverless industrial trucks safety) standard catalogue:https://www.iso.org/standard/68310.html
