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When should businesses invest in AS/RS automation?

AS/RS is not the default for every warehouse. Five signs it is time to consider Unit Load, Mini Load or Shuttle.

Trends8 min readThiên Khôi

Warehouse automation trends in Vietnam for 2025–2026 favor a staged path: digitize inventory and WMS first, then conveyors, shuttle or AS/RS. AS/RS investment only pays off when density, labor and throughput have already hit the limits of conventional racking.

Five signs it is time to consider AS/RS

  • Land lease / footprint expansion costs more than raising height and automating
  • Night-shift labor shortages or picking error rates rising with volume
  • Need for stable per-shift throughput (tens to hundreds of pallets/hour depending on design)
  • Relatively standard load sizes with uniform pallets or totes
  • Already running (or ready to deploy) WMS/WCS to sync inbound/outbound orders

Unit Load, Mini Load or Shuttle?

Unit Load (stacker crane) suits standard pallets, high-bay warehouses and high throughput per aisle. Mini Load optimizes small totes/cartons with goods-to-person picking. Shuttle raises density sharply with robots running inside lanes — a fit when you need deep pallet storage while keeping better speed than pure Drive In.

For warehouses under a few thousand positions, stacker crane CAPEX is often easier to model. Larger sites prioritizing 85%+ density and many fast-moving SKUs tend toward multi-shuttle — with more complex software and maintenance in return.

Foundation conditions you cannot skip

AS/RS demands floor flatness, tight rack tolerances and stable unit-load weights and dimensions. Rack design must be synchronized with automation equipment from day one — do not “buy robots then adjust the racks.” Thien Khoi advises aligning mechanics, layout and software integration before locking the solution.

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