🔆 Sizing Engine S2
Deep-Cycle Battery Bank Sizing Calculator
In short, Size your energy storage with accurate depth-of-discharge (DOD) limits, calculate days of autonomy, compare battery chemistries, and plan series/parallel unit layouts.
1. Daily Consumption & System Voltage
Not sure? Use our appliance audit tool.
2. Battery Chemistry & Unit Sizing
1 day
Days you can survive off-grid with 0% solar replenishment.
Battery Chemistry Usable Capacity & Cycle Life Comparison
| Battery Chemistry | Usable DoD Limit | Typical Cycle Life | Weight per 100Ah (12V) | Cold Weather Limit |
|---|---|---|---|---|
| Lithium (LiFePO4) | 80% – 90% | 3,500 – 5,000 cycles | ~26 – 31 lbs (12 kg) | No charging below 32°F / 0°C without heater |
| Sealed AGM Lead-Acid | 50% maximum | 400 – 600 cycles | ~60 – 68 lbs (28 kg) | Charges down to -4°F (-20°C) with reduced capacity |
| Flooded Lead-Acid | 50% maximum | 300 – 500 cycles | ~55 – 65 lbs (27 kg) | Requires regular distilled water replenishment |
Frequently Asked Questions
How accurate are these engineering numbers?
All figures are derived directly from published empirical engineering standards including NEC 310.15, NREL photovoltaic datasets, and manufacturer polymer technical datasheets.
Are calculations processed on a remote server?
No. Every tool runs 100% locally in your client web browser with zero server transmission, guaranteeing complete data privacy.