Li ion Ola shakti batteries vs Lead acid based batteries for inverters. Cost comparison. As a product manager, what points can be highlighted ?

 

Lifetime cost comparison — Tubular lead-acid vs Ola Li-ion, with annotated outputs

Good — I ran the lifetime calculations and added clear annotations as you asked (every lead-acid entry is prefixed “Tubular (lead-acid)”). I show: usable energy, upfront cost per hour (simple: price ÷ hours of one full discharge at 500 W), lifetime kWh delivered (usable kWh × cycle life), cost per kWh over the battery lifetime, and cost per hour over lifetime (cost per lifetime-kWh × 0.5 kW).

All numbers use the same base assumptions we used earlier (stated below) — I list them first so you can judge the math.

Assumptions (explicit)

  • Lead-acid nominal voltage = 12 V. Li-ion usable voltages already bundled in Ola pack capacities.

  • Usable energy fraction: Tubular (lead-acid) ≈ 40% of rated Wh (12V × Ah × 0.40). Ola Li-ion ≈ 81% of rated Wh (90% DoD × 90% conversion efficiency ≈ 0.81).

  • Typical cycle life (assumed): Tubular: 800–1000 cycles (varies by model). I used 150Ah→800, 220Ah→900, 250Ah→1000. Ola Li-ion: ~3000 cycles (approx typical modern Li-ion module spec used here).

  • Prices (from you / earlier):

    • Tubular (lead-acid) 150 Ah → ₹15,000

    • Tubular (lead-acid) 220 Ah → ₹17,000 (average used)

    • Tubular (lead-acid) 250 Ah → ₹19,000

    • Ola 1.5 kWh → ₹29,999

    • Ola 3.0 kWh → ₹55,999

    • Ola 9.1 kWh → ₹1,59,999

  • Load used to present “cost per hour” examples: 500 W (0.5 kW) typical “essential” home load.

  • Round numbers / rounding: final numbers rounded for clarity.

If you want different cycle-life assumptions (e.g., 600 cycles for cheap tubulares or 2,500 cycles for Li-ion), say so and I’ll re-run.

Key computed values (annotated)

Tubular (lead-acid) — 150 Ah (12 V) — Price ₹15,000

  • Usable energy ≈ 0.72 kWh

  • Backup at 500 W ≈ 1.44 hours

  • Upfront cost per hour (one full discharge): ₹15,000 ÷ 1.44 h = ₹10,417 / hour

  • Assumed cycles = 800 → Lifetime energy = 0.72 kWh × 800 = 576 kWh

  • Cost per lifetime kWh: ₹15,000 ÷ 576 = ₹26.04 / kWh

  • Cost per hour (lifetime) at 500 W = 0.5 × ₹26.04 = ₹13.02 / hour

Tubular (lead-acid) — 220 Ah (12 V) — Price ₹17,000

  • Usable energy ≈ 1.06 kWh

  • Backup at 500 W ≈ 2.12 hours

  • Upfront cost per hour: ₹17,000 ÷ 2.12 h = ₹8,019 / hour

  • Assumed cycles = 900 → Lifetime energy = 1.06 × 900 = 954 kWh

  • Cost per lifetime kWh: ₹17,000 ÷ 954 = ₹17.82 / kWh

  • Cost per hour (lifetime) at 500 W = 0.5 × ₹17.82 = ₹8.91 / hour

Tubular (lead-acid) — 250 Ah (12 V) — Price ₹19,000

  • Usable energy ≈ 1.20 kWh

  • Backup at 500 W ≈ 2.40 hours

  • Upfront cost per hour: ₹19,000 ÷ 2.40 h = ₹7,917 / hour

  • Assumed cycles = 1000 → Lifetime energy = 1.20 × 1000 = 1,200 kWh

  • Cost per lifetime kWh: ₹19,000 ÷ 1200 = ₹15.83 / kWh

  • Cost per hour (lifetime) at 500 W = 0.5 × ₹15.83 = ₹7.92 / hour

Ola Li-ion — 1.5 kWh — Price ₹29,999

  • Usable energy ≈ 1.215 kWh (1.5 × 0.81)

  • Backup at 500 W ≈ 2.43 hours

  • Upfront cost per hour: ₹29,999 ÷ 2.43 h = ₹12,294 / hour

  • Assumed cycles = 3000 → Lifetime energy = 1.215 × 3000 = 3,645 kWh

  • Cost per lifetime kWh: ₹29,999 ÷ 3,645 = ₹8.23 / kWh

  • Cost per hour (lifetime) at 500 W = 0.5 × ₹8.23 = ₹4.12 / hour

Ola Li-ion — 3.0 kWh — Price ₹55,999

  • Usable energy ≈ 2.43 kWh

  • Backup at 500 W ≈ 4.86 hours

  • Upfront cost per hour: ₹55,999 ÷ 4.86 h = ₹11,522 / hour

  • Assumed cycles = 3000 → Lifetime energy = 2.43 × 3000 = 7,290 kWh

  • Cost per lifetime kWh: ₹55,999 ÷ 7,290 = ₹7.68 / kWh

  • Cost per hour (lifetime) at 500 W = 0.5 × ₹7.68 = ₹3.84 / hour

Ola Li-ion — 9.1 kWh — Price ₹1,59,999

  • Usable energy ≈ 7.371 kWh

  • Backup at 500 W ≈ 14.74 hours

  • Upfront cost per hour: ₹1,59,999 ÷ 14.74 h = ₹10,853 / hour

  • Assumed cycles = 3000 → Lifetime energy = 7.371 × 3000 = 22,113 kWh

  • Cost per lifetime kWh: ₹1,59,999 ÷ 22,113 = ₹7.24 / kWh

  • Cost per hour (lifetime) at 500 W = 0.5 × ₹7.24 = ₹3.62 / hour

Interpretation / Practical takeaways

  1. Upfront cost-per-hour (single full discharge) looks extreme for all batteries because you pay the whole battery price for a few hours of backup. That metric is misleading if you plan to use the battery repeatedly over years.

    • Example: Tubular 250Ah shows ₹7,917 / hour upfront — but that’s just price ÷ hours for one cycle.

  2. Lifetime cost per kWh (and its derived cost per hour over lifetime) shows the real economic picture when you use the battery repeatedly across many cycles:

    • Ola Li-ion batteries (with assumed 3,000 cycles) give ₹7–8 / kWh lifetime, which translates to ≈ ₹3.6–4.1 / hour at a 500 W draw.

    • Tubular lead-acid (with lower cycles) give ₹15–26 / kWh lifetime, i.e. ≈ ₹8–13 / hour at 500 W.

    • Conclusion: Li-ion already becomes considerably cheaper per kWh over the battery life, despite higher upfront price — because of much higher cycle life and higher usable fraction.

  3. Other advantages of Li-ion that reinforce the economic case:

    • Faster charging, higher usable DoD, less maintenance, smaller footprint, much longer calendar/cycle life — so fewer replacements and less labor/maintenance cost.

    • Better for frequent daily cycling and solar integration.

  4. When a Tubular battery still makes sense:

    • If you expect very infrequent use (rare outages), short lifetime use, or severely constrained upfront budget — a tubular can be attractive as a low initial cost option.

    • Also if replacement/recycling costs and maintenance are acceptable and you won’t cycle it deeply or daily.

Quick visual summary (rounded)

  • Tubular 250Ah — lifetime cost ≈ ₹15.8 / kWh → ₹7.9 / hr at 500 W

  • Tubular 220Ah — lifetime cost ≈ ₹17.8 / kWh → ₹8.9 / hr at 500 W

  • Tubular 150Ah — lifetime cost ≈ ₹26.0 / kWh → ₹13.0 / hr at 500 W

  • Ola 1.5 kWh — lifetime cost ≈ ₹8.2 / kWh → ₹4.1 / hr at 500 W

  • Ola 3.0 kWh — lifetime cost ≈ ₹7.7 / kWh → ₹3.8 / hr at 500 W

  • Ola 9.1 kWh — lifetime cost ≈ ₹7.2 / kWh → ₹3.6 / hr at 500 W

Ref





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