Budget formulation focuses on structure, price, and proportion (Source: Foxtheon): Golden Rule: Batteries account for 48–55% (Source: Foxtheon); Core: PCS accounts for 15–25% (Source: Sunway); Note: Electrical infrastructure is most easily underestimated (Source: Ruis).
I.
Battery Costs
Proportion: Battery cells 48–55% (Source: Foxtheon); Unit Price: $88–102/kWh (Source: Foxtheon); Bare Cells: $40–55/kWh (Source: AnengJi); Price Drop: Lithium carbonate prices steadily dropped by 18% (Source: Foxtheon); Grade Differential: Premium for Grade A matched cells (Source: Foxtheon)—Battery: 48–55% + $88 + Grade Differential (three key points).
II.
PCS Costs
Proportion: PCS 15–25% (Source: Sunway); AC Side: $20–25/kWh (Source: BENY); Medium Voltage: PCS + Medium Voltage 12–20% (Source: SOLARTODO); 2-Hour System: High PCS cost burden for 2-hour systems (Source: SOLARTODO); Auxiliary Equipment: Transformers and switchgear (Source: BENY)—PCS: 15–25% + $20 + Medium Voltage (three parameters).
III. BMS/EMS
Cost Share: BMS/EMS 6–8% (Source: 2026 Energy Storage Report); Unit Price: 0.08–0.10 RMB/Wh (Source: 2026 Energy Storage Report); EMS: EMS/SCADA 3–8% (Source: SOLARTODO); AI Cost Reduction: AI algorithms reduce costs by 20% (Source: 2026 Energy Storage Report); Active Balancing: Active balancing costs 30% more (Source: Mida)—BMS: 6–8% + AI + Balancing (Three Key Points).
IV.
Container Thermal Management
Cost Share: Container cooling 10–15% (Source: SpecForge); DC Cabinet: $65–85/kWh (Source: AnengJi); Thermal Management: Liquid cooling $25–40/kWh (Source: Breakdown Report); Enclosure: Housing/Enclosure 5–10% (Source: Sunway); Fire Protection: Includes NFPA 855 fire protection (Source: BENY)—Container: 10–15% + $65 + Fire Protection (Three Components).
V.
Electrical Infrastructure
Cost Share: Electrical infrastructure 15–25% (Source: ruis); Underestimation: Most frequently underestimated category (Source: ruis); Cables: Transformer and switchgear cabling (Source: ruis); Construction & Installation: 8–10% (Source: 2026 Energy Storage Report); EPC: Installation/EPC 15% (Source: Anengji)—Electrical: 15–25% + Underestimation + EPC (Three Warnings).
VI. Budgeting Process
Breakdown: Hierarchical breakdown from cell to system (Source: CURENTA); Price Comparison: Comparing quotes from multiple vendors (Source: Industry practice); Batching: Inquiring based on MWh-scale orders (Source: Foxtheon); Verification: Verifying raw material cost pass-through (Source: AnengJi); Margin/Buffer: Reserving 10% for soft costs (Source: AnengJi)—Process: Breakdown + Price Comparison + Buffer (Three steps).
VII.
Procurement Recommendations
First, analyze structure (cell to system); second, compare unit prices ($/kWh); third, examine cost proportions (industry benchmarking); fourth, prioritize electrical components (do not underestimate them);
fifth, verify quality (Grade A cells)—Budgeting: Structure + Unit Price + Cost Proportion (Three core elements).
