⚡ Battery Bank Size Calculator
🔋 Professional battery bank sizing tool — Determine optimal energy storage capacity for solar, off-grid, or backup systems worldwide.
Based on daily consumption, autonomy days, depth of discharge (DoD), temperature derating & inverter efficiency.
This calculator follows global standards (NEC, IEC) and provides USA reference values, while being fully adaptable to any country.
Adjust inputs to match lead‑acid, LiFePO₄ or custom chemistries. Get instant kWh, Ah and battery bank configuration.
📊 System & Load Parameters
kWh/day
* Residential average: US ~29kWh, EU ~10kWh, off-grid typical 2-6kWh
80%
10%
📈 Required Battery Bank
🔋 Total Stored Energy (usable)
0.00 kWh
⚡ Battery Bank Capacity (at system voltage)
0 Ah
📐 Bank Energy (gross, incl margin)
0.00 kWh
⚙️ Configure module below ⬇️
🔧 Battery Module Specs (for configuration)
⚙️ Series & parallel recommendation will appear
📊 Battery Capacity vs Autonomy Days
* Chart shows required battery bank size (kWh) for 1-5 autonomy days under current settings
🌎 Key Factors & International Standards
🇺🇸 USA Reference: NEC 690 & residential storage: DoD ≤50% (Flooded Lead), ≥80% for LFP. Autonomy 2-3 days recommended for critical loads. Temperature derating mandatory below 0°C.
🌍 Global Adaptability: This calculator works with any country’s daily usage (kWh), local battery voltages (12/24/48V) and common chemistries. Adjust DoD and temp factor according to climate (e.g., EU colder zones use 0.85).
📏 Depth of Discharge: Lower DoD extends cycle life. For off‑grid world‑wide: Lead‑acid 30-50%, Li‑ion 70-90%.
❄️ Temperature Effect: Below 20°C capacity reduces (multiplier 0.85 at 0°C). Always factor for winter resilience.
⚡ Inverter Efficiency: DC side capacity must cover AC loads losses (0.9 to 0.96).