Here's a Comparison between Lithium Iron Phosphate (LiFePO4) and Lead-Acid Tall Tubular batteries for different capacities (12V/24V at 150Ah and 200Ah) to help determine the equivalent battery size needed based on backup time, Depth of Discharge (DoD), life cycle, efficiency, and weight. The backup times are calculated based on a 500W and 1000W load.
Comparison Table: LiFePO4 vs Lead-Acid (Tall Tubular) Batteries
| Battery Type | Voltage | Capacity (Ah) | Usable Capacity (Wh) | Depth of Discharge (DoD) | Life Cycle (approx.) | Efficiency (%) | Weight (approx.) | Backup for 500W Load | Backup for 1000W Load | Recommended LiFePO4 Equivalent |
|---|---|---|---|---|---|---|---|---|---|---|
| Lead Acid (C10) | 24V | 150Ah | 1800 Wh | 50% | 600–800 cycles | 70–80% | ~55 kg | ~3.6 hours | ~1.8 hours | LiFePO4 24V 80–100Ah |
| Lead Acid (C10) | 24V | 200Ah | 2400 Wh | 50% | 600–800 cycles | 70–80% | ~70 kg | ~4.8 hours | ~2.4 hours | LiFePO4 24V 100–120Ah |
| Lead Acid (C20) | 12V | 150Ah | 900 Wh | 50% | 600–800 cycles | 70–80% | ~45 kg | ~1.8 hours | ~0.9 hours | LiFePO4 12V 80–90Ah |
| Lead Acid (C20) | 12V | 200Ah | 1200 Wh | 50% | 600–800 cycles | 70–80% | ~60 kg | ~2.4 hours | ~1.2 hours | LiFePO4 12V 100–110Ah |
| LiFePO4 | 24V | 100Ah | 2400 Wh | 90–95% | 3000–5000 cycles | 90–98% | ~24 kg | ~4.8 hours | ~2.4 hours | Equivalent to 24V 200Ah Lead Acid |
| LiFePO4 | 24V | 150Ah | 3600 Wh | 90–95% | 3000–5000 cycles | 90–98% | ~35 kg | ~7.2 hours | ~3.6 hours | Equivalent to 24V 300Ah Lead Acid |
| LiFePO4 | 12V | 100Ah | 1200 Wh | 90–95% | 3000–5000 cycles | 90–98% | ~12 kg | ~2.4 hours | ~1.2 hours | Equivalent to 12V 200Ah Lead Acid |
| LiFePO4 | 12V | 150Ah | 1800 Wh | 90–95% | 3000–5000 cycles | 90–98% | ~20 kg | ~3.6 hours | ~1.8 hours | Equivalent to 12V 300Ah Lead Acid |
Key Takeaways
Usable Capacity:
- LiFePO4 batteries offer a much higher Depth of Discharge (DoD), typically 90–95%, compared to 50% for lead-acid. This means a LiFePO4 battery of lower Ah rating can match or exceed the usable capacity of a larger lead-acid battery.
Life Cycle:
- LiFePO4 batteries generally last 3000–5000 cycles, far more than lead-acid batteries, which range around 600–800 cycles.
Efficiency:
- LiFePO4 batteries have higher efficiency (90–98%), which means more of the stored energy is actually usable, whereas lead-acid batteries have only 70–80% efficiency.
Weight and Portability:
- LiFePO4 batteries are lighter, making them easier to handle and install, while lead-acid batteries are significantly heavier.
Backup Duration:
- For a 500W load, a 24V 150Ah LiFePO4 battery would provide 7.2 hours of backup compared to 3.6 hours with a lead-acid equivalent, doubling the runtime.
- For a 1000W load, the same 150Ah LiFePO4 battery offers 3.6 hours of backup, compared to 1.8 hours with the lead-acid equivalent.
Recommended LiFePO4 Equivalent:
- To replace a 24V 200Ah lead-acid battery, a 24V 100Ah LiFePO4 is sufficient due to the higher DoD and efficiency.
- Similarly, for a 12V 200Ah lead-acid replacement, a 12V 100Ah LiFePO4 will match the performance.
Conclusion
If cost allows, LiFePO4 batteries are ideal for their higher DoD, longevity, efficiency, and weight benefits. For a 500W–1000W load, a LiFePO4 battery with half the capacity of a lead-acid counterpart can offer comparable or better performance, making it more cost-effective over time.
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