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Battery Size Formula:
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The Solar Battery Size Calculator helps determine the appropriate battery capacity (in ampere-hours) needed for solar power systems in Australia, based on your daily energy consumption and system voltage.
The calculator uses the following equation:
Where:
Explanation: The equation converts your daily energy needs into battery capacity while accounting for real-world system inefficiencies.
Details: Correct battery sizing is crucial for solar systems to ensure you have enough storage for your needs without overspending on unnecessary capacity.
Tips: Enter your daily energy consumption in watt-hours and your system voltage. The 1.1 multiplier accounts for typical inefficiencies in Australian solar systems.
Q1: Why is there a 1.1 multiplier in the formula?
A: The 10% buffer accounts for typical energy losses in battery charging/discharging and system inefficiencies common in Australian conditions.
Q2: How do I determine my daily watt-hour consumption?
A: Multiply the power rating (W) of each appliance by its daily usage hours, then sum all values. Many Australian energy monitors can provide this data.
Q3: What voltage should I use for my calculation?
A: Common Australian solar battery voltages are 12V, 24V, or 48V. Choose based on your system design - higher voltages are more efficient for larger systems.
Q4: Does this account for days of autonomy?
A: This calculates minimum daily requirements. For backup days, multiply the result by your desired days of autonomy (typically 2-3 in Australia).
Q5: Is this calculation specific to Australia?
A: Yes, the 1.1 multiplier accounts for typical Australian conditions including temperature variations and solar irradiance patterns.