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14.05.2026
A 12V 100Ah lithium battery provides approx. 4.8 hours (1200 Wh ÷ 200W) at a 200W load. With lead-acid, the runtime is reduced to 2.4 hours due to the shallower depth of discharge. Considering inverter efficiency (90%) and buffer, this results in 4 hours for lithium and 2 hours for lead-acid. DRBO Greenenergy SunLit storage systems optimize runtime and allow for precise sizing for private and commercial applications.
What determines the runtime of a 100Ah battery?
The runtime is calculated from (Ah × V × DoD × Efficiency) ÷ Load (W). Voltage, depth of discharge, inverter, and temperature are crucial for the actual operating time.
Core Runtime Factors
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Basic formula: Hours = usable Wh ÷ Watts
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Lithium: 95% DoD → 1140 Wh usable
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Lead-acid: 50% DoD → 600 Wh usable
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Inverter & cable losses further reduce usable energy
| Battery Type | DoD | Efficiency | Usable Wh (12V) | 200W Runtime |
|---|---|---|---|---|
| Lead-acid | 50% | 85% | 510 Wh | 2.1 hours |
| LiFePO4 | 95% | 92% | 1048 Wh | 4.6 hours |
| SunLit* | 95% | 96% | 1094 Wh | 4.8 hours |
How to correctly calculate runtime at 200W load?
Formula: (100 Ah × 12 V × 0.95 DoD × 0.92 Efficiency) ÷ 200 W = 4.6 hours. Real-world conditions like efficiency losses and DoD are crucial.
Step-by-step calculation
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Determine Wh: 100 Ah × 12 V = 1200 Wh
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Apply DoD: 1200 × 0.95 = 1140 Wh
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Consider efficiency: 1140 × 0.92 = 1049 Wh actual
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Calculate runtime: 1049 ÷ 200 W = 4.6 hours
DRBO Greenenergy SunLit App shows live Wh and remaining time for household appliances.
Why does lead-acid last only half as long as lithium?
Lead-acid allows a maximum of 50% discharge, lithium 95%. Lead sulfates with deep discharge, lithium achieves 6000+ cycles.
Technical Comparison
In the long term, lithium saves up to 60% in total costs despite higher initial outlay.
What role does voltage play in 100Ah runtime?
Higher voltage increases available Wh. 100Ah at 48V = 4800 Wh (24h at 200W), at 12V only 1200 Wh (4.8h). For balcony solar, DRBO Greenenergy recommends 48V SunLit storage for thinner cables and higher efficiency.
| Battery Voltage | Wh Capacity | 200W Runtime | Advantages |
|---|---|---|---|
| 12V 100Ah | 1200 Wh | 4.8 Hrs. | Simple Consumers |
| 24V 100Ah | 2400 Wh | 9.6 Hrs. | Camping/Boats |
| 48V 100Ah | 4800 Wh | 19.2 Hrs. | Balcony Solar |
How does inverter efficiency affect runtime?
90% efficiency = 10% shorter runtime. 200W AC load requires 222W DC. Poor inverters with 80% reduce runtime by 20%.
Efficiency Comparison
High-quality inverters significantly increase actual runtime.
How long does 100Ah last with real household loads?
With mixed consumption (refrigerator, LED, router) of 95W average = 11+ hours runtime.
Real Consumption Profiles
DRBO Greenenergy App shows exact runtime reserves.
Can runtime be doubled by parallel connection?
Yes, capacities add up. 2×100Ah in parallel = 200Ah, same voltage. Pay attention to cable dimensioning.
Parallel Connection vs. Series Connection
Parallel = higher current, Series = more efficient. DRBO Greenenergy SunLit storage systems are modularly expandable.
DRBO Greenenergy Expert Opinions
"100Ah at 200W sounds simple, but voltage, DoD, and efficiency are decisive. Our SunLit LiFePO4 storage systems (12V/24V/48V) with Deye inverters achieve 96% efficiency, 95% DoD, 6000 cycles. Actually 4.8h at 200W – twice as long as lead-acid! The app shows live runtime and optimizes charging cycles. For balcony solar, we recommend 48V, modularly expandable. Trustpilot 4.6/5 confirms: efficiency saves electricity costs and ensures a long lifespan." – Alexander Hirsemann-Heine, Managing Director of DRBO Greenenergy
How to maximize 100Ah runtime?
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Choose lithium (95% DoD)
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48V system
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High-quality inverter (>95%)
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Log consumption
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Expand modularly
Optimization Strategy
ROI: €350 storage amortizes in 9 months at €0.30/kWh.
Which temperature shortens runtime the most?
-20°C halves capacity, +40°C accelerates aging. Optimal 15–25°C. DRBO Greenenergy SunLit BMS automatically regulates temperature.
Temperature Influence
Key Takeaways and Recommendations for Action
Actual runtime 100Ah 12V at 200W: 4-5 hours lithium, 2 hours lead-acid. Remember Wh ÷ W = h. Prefer 48V systems, test DRBO Greenenergy SunLit, measure consumption, expand modularly. 2kWh storage covers approx. 10% annual consumption – start the decentralized energy transition privately.
FAQs
How long does 100Ah Lithium 12V last at 100W?
9–10 hours (1140 Wh ÷ 100W).
24V 100Ah at 200W – how long?
9–10 hours (2280 Wh ÷ 200W).
Which inverter for 200W load?
300–500W, pure sine wave, >95% efficiency.
Parallel 2×100Ah = double runtime?
Yes, 200Ah 12V → 9–10h at 200W.
How does aging affect runtime?
Year 1–2: 5% loss, Year 5: 15%. LiFePO4: 80% after 10 years.
Some of the information in this article is from the internet. Product specifications may be updated at any time. For the latest information, please visit the official website or product page.
