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Backup Time Formula:
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The Solar Battery Backup Time Calculator estimates how long a solar battery system can power a load based on its capacity, efficiency, and the connected load. This helps in planning and optimizing solar energy systems for reliable backup power.
The calculator uses the formula:
Where:
Explanation: The formula calculates the duration a battery can supply power by considering its total energy storage (capacity), accounting for energy losses (efficiency), and dividing by the consumption rate (load).
Details: Accurate backup time estimation is essential for designing reliable solar power systems, ensuring adequate power supply during outages, and optimizing battery sizing for specific energy needs.
Tips: Enter battery capacity in Ah, system efficiency as a decimal (e.g., 0.85 for 85%), and load in amperes. All values must be positive numbers.
Q1: What is a typical battery efficiency value?
A: Most lead-acid batteries have 80-85% efficiency, while lithium-ion batteries typically achieve 90-95% efficiency.
Q2: How does load affect backup time?
A: Higher loads decrease backup time proportionally. Doubling the load halves the backup time, assuming other factors remain constant.
Q3: Should I consider depth of discharge?
A: Yes, for accurate calculations, multiply capacity by the depth of discharge percentage (e.g., 0.8 for 80% DoD) before using in the formula.
Q4: What factors affect system efficiency?
A: Inverter efficiency, battery internal resistance, wiring losses, and temperature all contribute to overall system efficiency.
Q5: Can this calculator be used for different battery types?
A: Yes, the formula works for all battery types, but efficiency values may vary significantly between different battery chemistries.