For many first-time AGV importers, the biggest unexpected cost is not the AGV itself—it is container-related charges caused by customs delays, incomplete lithium battery documentation, or site readiness issues.

Understanding demurrage, detention, chassis fees, and customs clearance requirements can help prevent thousands of dollars in avoidable project costs.

Key Insight:

Most AGV import cost overruns are caused by documentation delays and unloading readiness issues—not equipment pricing.

1. What Is Demurrage?

Demurrage is charged by the port or terminal when a container remains inside the terminal beyond the free storage period.

Vessel Arrival
↓
Free Terminal Days
↓
Demurrage Charges Begin

Common Causes

• Customs holds or inspections

• Missing lithium battery documentation

• Delayed customs broker action

• Warehouse not ready to receive equipment

2. What Is Detention?

Detention is charged by the ocean carrier after the container has been picked up from the terminal but is not returned within the allowed timeframe.

Container Picked Up
↓
Free Equipment Days
↓
Detention Charges Begin

Common Causes

• Slow unloading process

• AGV installation delays

• Site not prepared

• Limited chassis availability

3. What Is Chassis Per-Diem?

Chassis charges are separate from detention and apply when a carrier-provided chassis remains in use beyond the free period.

Free Chassis Days
↓
Daily Chassis Rental Fee

At major US ports, chassis costs have become an increasingly important component of total landed cost.

4. Typical Free Time at Major US Ports

Free-time policies vary by shipping line, terminal operator, and congestion level. Always verify before shipment.

5. Typical Daily Charges

A delay involving multiple AGV containers can escalate quickly.

4 Containers × $250/day × 7 Days = $7,000

A single customs delay can consume a significant portion of your project contingency budget.

6. Lithium Battery Documentation Risks

Most AGVs imported from China use lithium batteries and require complete documentation before customs clearance.

Required Documents

• UN38.3 Test Report

• Battery Specification Sheet

• Safety Data Sheet (SDS/MSDS)

• Dangerous Goods Declaration (if applicable)

• Correct HTS Classification

• Proper Battery Labeling

Missing or inconsistent documentation is one of the most common reasons AGV shipments are selected for customs review.

Potential Consequences

• Documentation requests

• Customs examinations

• Port storage delays

• Truck rescheduling costs

• Demurrage and detention fees

7. Can AGVs Be Cleared Before Vessel Arrival?

Yes. Most AGV projects should use Pre-Arrival Entry (Advance Customs Filing).

Documents Received
↓
Broker Files Entry
↓
Vessel Arrives
↓
Cargo Released

Benefits

• Faster cargo release

• Reduced storage risk

• Improved truck scheduling

• Lower demurrage exposure

8. Recommended Pre-Clearance Package

Provide the following documents to your customs broker 5–10 days before vessel arrival:

• Commercial Invoice

• Packing List

• Bill of Lading

• Battery Certifications

• Product Specifications

• HTS Classification

• Country of Origin Declaration

9. AGV-Specific Risk Areas

Assume:

• 3 Containers

• 5 Free Terminal Days

• 6 Additional Days of Customs Delay

Demurrage Cost

3 Containers × $250 × 6 Days = $4,500

Detention Cost

3 Containers × $150 × 4 Days = $1,800

Total Additional Cost

$6,300

This does not include customs examination fees, trucking delays, or chassis rental charges.

11. Best Practices for AGV Buyers

✓ Verify UN38.3 reports before shipment

✓ Confirm SDS/MSDS documentation is complete

✓ Engage customs broker early

✓ Ensure warehouse readiness before vessel arrival

✓ Reserve unloading equipment in advance

✓ Negotiate free-time terms in writing

✓ Review chassis terms separately

✓ Understand carrier detention schedules

12. Procurement Recommendation

The safest AGV import strategy is:

1. Pre-clear customs before vessel arrival

2. Have lithium battery documentation reviewed before shipment leaves China

3. Negotiate additional free days whenever possible

4. Ensure warehouse unloading readiness before container release

5. Budget contingency funds for demurrage and detention

Conclusion

For most AGV projects, unexpected logistics costs are caused by preventable delays rather than equipment pricing.

A well-prepared import plan—including customs pre-clearance, battery compliance documentation, and site readiness—can save thousands of dollars and keep AGV deployment on schedule.

Successful AGV procurement is not only about selecting the right automation technology. It is equally about managing logistics risk, customs compliance, and execution readiness from the moment the equipment leaves China until it is fully operational on-site.