Lithium vs Lead-Acid Battery Usable Capacity Comparison Calculator
RV/Marine/Solar buyers deciding whether to upgrade to lithium batteries. Side-by-side comparison of usable energy, cycle life, weight, and lifetime cost per kWh between LiFePO4 (90% DoD, 4000 cycles) and Lead-Acid (50% DoD, 500 cycles).
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical engineering physics and National Electrical Code (NFPA 70) regulations.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between Nominal Amp-Hours (Ah), Voltage (V), Daily Cycles to determine Usable Wh Comparison, Weight Savings (lbs/kg), 10-Year Cost per kWh. In practical installations, factors such as ambient raceway temperature, harmonic distortion, duty cycle continuous operation, and conductor impedance must be accounted for by a certified electrician.
Side-by-side comparison of usable energy, cycle life, weight, and lifetime cost per kWh between LiFePO4 (90% DoD, 4000 cycles) and Lead-Acid (50% DoD, 500 cycles).
Typical Application & Industry Guidelines
RV/Marine/Solar buyers deciding whether to upgrade to lithium batteries.
Lithium vs Lead-Acid Battery Usable Capacity Comparison Calculator Benchmark Lookup Table
| Specification | Lead-Acid (AGM) | Lithium (LiFePO4) | Advantage |
|---|---|---|---|
| Safe Depth of Discharge (DoD) | 50% | 90% - 100% | Lithium (+80% more energy) |
| Cycle Lifespan (to 80% capacity) | 300 - 500 Cycles | 3,500 - 6,000 Cycles | Lithium (10x longer life) |
| Weight per 100Ah (12V) | 60 - 70 lbs (29 kg) | 24 - 28 lbs (12 kg) | Lithium (60% lighter) |
| Round-Trip Efficiency | 80% - 85% | 95% - 98% | Lithium (+15% solar efficiency) |
| Voltage Stability Under Load | Steep voltage sag | Flat discharge curve | Lithium (consistent inverter voltage) |
| 10-Year Total Cost of Ownership | High (replace 3-4 times) | Low (single investment) | Lithium (50% lower lifetime cost) |