SPECIFICATION SHEET • SI METRIC
CAT: ELECTRICAL-ENERGY

Solar PV Array & Battery Storage (BESS) Sizing

Calculate solar PV array capacity (kWp) and lithium battery bank size (kWh/Ah) for commercial & industrial microgrids.

💡 Engineering Knowledge PrimerCommercial solar and Battery Energy Storage System (BESS) sizing balances daily load consumption against regional peak sun hours. Applying battery Depth of Discharge (DoD) limits (80% for LiFePO4, 50% for Lead-Acid) prevents thermal runaway and extends battery cycle life to 15+ years.
OPERATING LIMITS — Energy-capacity calculation only; equipment design requires a load profile, efficiency, temperature, aging and protection study.
INPUT DESIGN PARAMETERS (SI)
kWh/d
h/d
days
%
V
CALCULATED SPECIFICATION OUTPUT
Required Solar PV Array Capacity
⚡
44.4 kWp
Battery Bank Energy Capacity375 kWh
Battery Bank Amp-Hour Rating7813 Ah

Related planning checklists

This calculator appears in the following engineering planning checklists:

1. Three-Phase Electrical Power2. Plant Energy Consumption & Cost3. Industrial CO2 Carbon Emissions4. Solar PV Array & Battery Storage (BESS) Sizing

Technical Methodology & Engineering Principles

GOVERNING EQUATION
PV Capacity (kWp) = Daily Demand (kWh) / (Peak Sun Hours × 0.75 System Derate) Battery kWh = (Daily kWh × Autonomy Days) / (DoD / 100) Battery Ah = (Battery kWh × 1000) / Bus Voltage
Assumptions & Scope

75% overall PV derate factor accounting for inverter efficiency, temperature loss, and wiring drop.

Operating Range & Boundary

Use finite, physically meaningful inputs within the stated operating assumptions.