Off-Grid Battery Bank Sizing Calculator
Solar cabin sizing, marine long-range cruising electrical design. Calculates total required Amp-hour capacity for an off-grid system to survive consecutive cloudy days without solar production.
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical equations and National Electrical Code guidelines.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between Daily Energy Consumption (Wh/day), Days of Autonomy (1-3 days), System Voltage (12/24/48V), Battery Chemistry (AGM / LiFePO4) to determine Required Battery Ah, Number of Parallel/Series Batteries, Total Weight Estimate. In practical applications, electrical systems must account for safety derating factors, nominal vs actual voltages, and conductor resistance losses.
Calculates total required Amp-hour capacity for an off-grid system to survive consecutive cloudy days without solar production.
Typical Application & Best Practices
Solar cabin sizing, marine long-range cruising electrical design.
Off-Grid Battery Bank Sizing Calculator Benchmark Lookup Table
| Daily Wh Usage | Days of Autonomy | 12V Bank Ah | 24V Bank Ah | 48V Bank Ah |
|---|---|---|---|---|
| 1,000 Wh/day | 1 Day | 116 Ah | 58 Ah | 29 Ah |
| 2,400 Wh/day | 2 Days | 556 Ah | 278 Ah | 139 Ah |
| 4,000 Wh/day | 2 Days | 926 Ah | 463 Ah | 232 Ah |
| 6,000 Wh/day | 3 Days | 2,083 Ah | 1,042 Ah | 521 Ah |