Battery Charging Cost Calculator
Estimate the cost to fully charge your battery
Battery Charging Cost Calculator
Estimate your battery charging expenses
Results:
Energy Consumed (kWh): 0.00
Total Charging Cost ($): 0.00
How to Use the Calculator
Step-by-Step Guide
- Enter the battery's capacity in Ampere-hours (Ah).
- Input the battery's nominal voltage in Volts (V).
- Provide the charger's efficiency as a percentage (e.g., 85 for 85%).
- Enter your local electricity cost per kilowatt-hour ($/kWh).
- Click "Calculate Cost" to see the energy consumed and total charging cost.
Understanding Inputs
- Battery Capacity (Ah): How much charge the battery can hold.
- Battery Voltage (V): The nominal voltage of the battery pack.
- Charger Efficiency (%): The percentage of input power that is converted to useful output power by the charger. Typical values are 80-95%.
- Cost per kWh ($/kWh): Your electricity rate, usually found on your utility bill.
Tips for Accuracy
- Use the battery's rated capacity and voltage for best results.
- If charger efficiency is unknown, a common estimate is 85%.
- Ensure your electricity cost is up-to-date for accurate billing.
- Consider peak vs. off-peak rates if applicable.
Battery Charging Cost Fundamentals
Energy Calculation
The energy stored in a battery is calculated by multiplying its capacity (Ah) by its voltage (V) to get Watt-hours (Wh). This is then converted to kilowatt-hours (kWh) for cost calculation.
- Energy (Wh) = Capacity (Ah) × Voltage (V)
- Energy (kWh) = Energy (Wh) / 1000
Charger Efficiency
- Chargers are not 100% efficient; some energy is lost as heat during the charging process.
- To account for this, the energy required from the grid is higher than the energy stored in the battery.
- Energy from Grid (kWh) = Energy (kWh) / (Charger Efficiency / 100)
Key Formulas:
Energy (kWh) = (Battery Capacity (Ah) × Battery Voltage (V)) / 1000
Energy from Grid (kWh) = Energy (kWh) / (Charger Efficiency / 100)
Total Cost = Energy from Grid (kWh) × Cost per kWh ($/kWh)
Calculation Formulas
Energy (kWh):
kWh = (Ah × V) / 1000
Energy from Grid (kWh):
kWh_grid = kWh / (Efficiency / 100)
Total Charging Cost ($):
Cost = kWh_grid × Cost_per_kWh
Example Calculation
For a 100Ah, 12V battery with 85% charger efficiency and $0.15/kWh electricity cost:
Battery Energy (Wh) = 100Ah × 12V = 1200 Wh
Battery Energy (kWh) = 1200 Wh / 1000 = 1.2 kWh
Energy from Grid (kWh) = 1.2 kWh / (85 / 100) = 1.4118 kWh
Total Charging Cost = 1.4118 kWh × $0.15/kWh = $0.21
Energy Consumed = 1.41 kWh | Total Cost = $0.21
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