What is the load capacity of a 100Ah battery?
A 100Ah battery’s load capacity refers to its ability to deliver current over time, calculated as Ampere-hours (Ah). At nominal voltage (e.g., 12V), it provides 100A for 1 hour or 10A for 10 hours. Actual capacity depends on discharge rate (C-rating) and voltage system—12V systems yield 1.2kWh (100Ah × 12V), while 48V systems offer 4.8kWh. Pro Tip: Derate capacity by 20% for lead-acid batteries to avoid deep discharges below 50% SOC.
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How does voltage affect a 100Ah battery’s load capacity?
A 100Ah battery’s energy capacity (kWh) scales with voltage. For example, a 12V system stores 1.2kWh, while a 24V version doubles to 2.4kWh. This determines runtime for inverters—a 24V 100Ah battery running a 500W load lasts ~4.8 hours (2400Wh ÷ 500W), versus 2.4 hours at 12V.
What limits a 100Ah battery’s peak current output?
Peak current depends on BMS (Battery Management System) limits and cell chemistry. Lithium LiFePO4 100Ah batteries typically handle 1C continuous (100A), while lead-acid maxes at 0.5C (50A). Pro Tip: For high-draw applications like power tools, use lithium with 2-3C ratings (200-300A bursts).
| Chemistry | Peak Current | Sustained |
|---|---|---|
| LiFePO4 | 200A (2C) | 100A |
| Lead-Acid | 150A (1.5C) | 50A |
How does temperature impact 100Ah capacity?
Capacity drops 20-40% below 0°C for lead-acid, while lithium retains >80% at -20°C. At 40°C, lead-acid degrades 50% faster. For cold climates, lithium’s -30°C to 60°C range outperforms lead-acid’s 20-25°C ideal zone.
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FAQs
Yes, but duration depends on voltage. A 12V system lasts ~1 hour (1000W ÷ 12V = 83.3A draw), while 48V extends to ~4.8 hours (1000W ÷ 48V = 20.8A).
How to calculate 100Ah battery runtime?
Runtime (hours) = (Ah × Voltage × DoD%) ÷ Load Watts. Example: 12V 100Ah @ 80% DoD running 300W = (100 × 12 × 0.8) ÷ 300 ≈ 3.2 hours.
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