General Energy Savings Analysis

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Expected Energy Bill Savings from a 6kW Solar Power System with 9.6kWh Battery Storage.

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Integrating a 9.6kWh battery storage system with your 6kW solar power system significantly enhances your energy savings by allowing you to store excess solar energy for use during non-sunny hours. This maximises self-consumption and reduces reliance on grid electricity. Below is a detailed analysis of the expected savings with this setup.

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System Overview

• Solar PV Capacity: 6kW

• Average Daily Solar Generation: 6kW x 4.2 kWh/kW = 25.2 kWh/day

• Battery Storage Capacity: 9.6 kWh

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Energy Distribution Scenario

• Direct Self-Consumption: 30% of total generation

• Excess Energy: 70% of total generation

• Battery Utilisation: Stores up to 9.6 kWh of excess energy

• Remaining Excess Energy: Fed back into the grid

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Detailed Savings Calculation

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Step 1: Determine Energy Allocation

1. Direct Self-Consumption

   • Energy Consumed Directly: 30% of 25.2 kWh = 7.56 kWh/day

2. Excess Energy After Direct Consumption

   • Excess Energy: 70% of 25.2 kWh = 17.64 kWh/day

3. Battery Storage Utilisation

   • Energy Stored in Battery: Minimum of excess energy and battery capacity = 9.6 kWh/day (since 17.64 kWh > 9.6 kWh)

   • Remaining Excess Energy Fed to Grid: 17.64 kWh - 9.6 kWh = 8.04 kWh/day

4. Total Self-Consumption Including Battery Usage

   • Total Self-Consumed Energy: 7.56 kWh + 9.6 kWh = 17.16 kWh/day

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Step 2: Calculate Monetary Savings

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1. Savings from Self-Consumption

   • Electricity Rate: $0.40 per kWh

   • Savings: 17.16 kWh x $0.40 = $6.86/day

2. Earnings from Feed-In Tariff

   • Feed-In Rate: $0.05 per kWh

   • Earnings: 8.04 kWh x $0.05 = $0.40/day

3. Total Daily Savings

   • Total Savings: $6.86 + $0.40 = $7.26/day

4. Total Annual Savings

   • Annual Savings: $7.26 x 365 = $2,649.90/year

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Key Takeaways

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• Increased Self-Consumption: Battery storage boosts self-consumption from 30% (7.56 kWh) to approximately 68% (17.16 kWh).

• Enhanced Savings: Incorporating a 9.6kWh battery nearly doubles your annual savings, adding an extra $1,226.40 per year compared to a system without battery storage.

• Reduced Grid Dependence: The battery allows you to utilise more of your generated solar energy during peak usage times, reducing reliance on expensive grid electricity.

• Optimised Energy Usage: Excess energy storage ensures efficient use of solar production and provides backup power during outages or low production periods.

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Conclusion

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Investing in a 9.6kWh battery storage system alongside your 6kW solar power system is a financially sound decision that maximises your energy savings and enhances energy independence. This setup not only provides substantial annual savings but also contributes to a more sustainable and resilient energy consumption model.