What’s the Difference Before and After Installing a Battery for a 20kW Solar PV System?
August 6, 2025
Here’s a real-world example that shows the impact clearly:
🔋 Before Installing the Battery
- PV system: 20kW
- Average night-time electricity usage: 12.34 kWh
- Quarterly electricity bill: $234 AUD (to pay)
🔋 After Installing a 10kWh Battery
- Average night-time usage drops to: 4.38 kWh
- Quarterly electricity bill: –$190 AUD (credit)
- Total quarterly savings: $234 + $190 = $424 AUD
This is with just a 10kWh battery. If you install a larger 50kWh battery, your energy independence and savings will multiply, especially for homes with high energy usage or EV charging needs.
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