Deep Cycle Battery Runtime Calculator

Runtime Formula:

\[ Runtime = \frac{Battery\ Capacity\ (Ah) \times DoD \times Voltage}{Load\ (W)} \]

Battery Capacity Ah (Ah):

DoD (depth of discharge decimal):

decimal

Voltage (V):

Load Watts (W):

Runtime:

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1. What is Deep Cycle Battery Runtime?

Deep cycle battery runtime refers to the duration a battery can power a specific load before needing recharging. It's calculated based on battery capacity, depth of discharge, voltage, and load power consumption.

2. How Does the Calculator Work?

The calculator uses the runtime formula:

\[ Runtime = \frac{Battery\ Capacity\ (Ah) \times DoD \times Voltage}{Load\ (W)} \]

Where:

\( Battery\ Capacity \) — Amp-hour rating of the battery (Ah)
\( DoD \) — Depth of Discharge (decimal value between 0-1)
\( Voltage \) — Battery system voltage (V)
\( Load \) — Power consumption of the connected device (W)

Explanation: The formula calculates how long a battery can sustain a specific load while considering the safe discharge depth to preserve battery life.

3. Importance of Runtime Calculation

Details: Accurate runtime calculation is crucial for designing reliable power systems, ensuring uninterrupted operation, and preventing premature battery discharge that can damage deep cycle batteries.

4. Using the Calculator

Tips: Enter battery capacity in Ah, depth of discharge as decimal (0.5 for 50%), system voltage in volts, and load power in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is Depth of Discharge (DoD)?
A: DoD indicates how much of the battery's capacity has been used. A higher DoD means more capacity used but may reduce battery lifespan if consistently discharged deeply.

Q2: What are typical DoD values for deep cycle batteries?
A: Most deep cycle batteries recommend 50-80% DoD for optimal lifespan, though some lithium batteries can handle deeper discharges up to 90%.

Q3: Why is voltage important in runtime calculation?
A: Voltage determines the energy storage capacity (Watt-hours = Ah × V), which directly affects how long the battery can power a specific load.

Q4: How does temperature affect battery runtime?
A: Cold temperatures reduce battery capacity and runtime, while high temperatures can increase capacity but may reduce overall battery lifespan.

Q5: Should I consider efficiency losses?
A: Yes, actual runtime may be 10-15% less due to inverter efficiency, wiring losses, and battery internal resistance not accounted for in this basic calculation.