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Battery Run Time Formula:
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The battery run time calculation estimates how long a battery will last under a specific electrical load. It's essential for home energy planning, backup power systems, and determining appropriate battery sizes for various applications.
The calculator uses the simple formula:
Where:
Explanation: This formula calculates how many hours a battery can supply a specific current before being fully discharged.
Details: Accurate battery run time estimation is crucial for designing reliable power backup systems, sizing batteries for solar installations, and ensuring uninterrupted power supply for critical home appliances.
Tips: Enter battery capacity in ampere-hours (Ah) and electrical load in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.
Q1: Is this calculation accurate for all battery types?
A: This provides a theoretical maximum. Actual run time may vary based on battery chemistry, age, temperature, and discharge rate.
Q2: What factors affect actual battery run time?
A: Battery age, temperature, discharge rate, depth of discharge limitations, and efficiency of the inverter/converters all impact actual performance.
Q3: Should I consider battery efficiency in calculations?
A: For lead-acid batteries, derate by 20-30%. For lithium-ion, derate by 10-15% to account for real-world conditions.
Q4: How does battery voltage affect this calculation?
A: The formula works for any voltage as long as capacity is in Ah and load is in A. For watt-based calculations, convert using Power = Voltage × Current.
Q5: Can this calculator be used for solar battery systems?
A: Yes, but also consider daily energy consumption, solar input, and days of autonomy for complete system sizing.