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Battery Amp Draw Formula:
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The battery amp draw calculation determines the current consumption of a 25 watt VHF radio based on the operating voltage. This helps in proper battery sizing and runtime estimation for radio operations.
The calculator uses the electrical power formula:
Where:
Explanation: The formula calculates the current required by dividing the radio's power consumption (25 watts) by the operating voltage.
Details: Accurate current calculation is essential for selecting appropriate battery capacity, estimating operational runtime, and ensuring reliable radio communication without power interruptions.
Tips: Enter the operating voltage in volts. The value must be valid (voltage > 0). Typical VHF radio voltages range from 12V to 24V for mobile installations.
Q1: Why is 25 watts used in the formula?
A: This calculator is specifically designed for 25 watt VHF radios, which is a common power output for marine and mobile VHF communications.
Q2: Does this account for efficiency losses?
A: No, this calculation provides theoretical current draw. Actual current may be slightly higher due to efficiency losses in the radio's power circuitry.
Q3: What voltage should I use for calculation?
A: Use the actual operating voltage of your radio system. For mobile installations, this is typically 12V or 24V depending on your vehicle's electrical system.
Q4: How does this help with battery selection?
A: Knowing the current draw helps determine how long a battery will last. For example, a 100Ah battery would theoretically last 100Ah ÷ calculated amps hours.
Q5: Is this calculation accurate for all 25W radios?
A: While the formula is generally accurate, actual current consumption may vary slightly between different radio models and manufacturers.