How to Calculate Your Real Savings from a Home Solar and Battery System

If you are frustrated by climbing electricity bills, you aren't alone. With the average Victorian default offer hovering around 30c per kWh and standard daily supply charges constantly creeping up, sticking with the grid is an expensive waiting game.

To make matters worse, as of late 2025, the regulated minimum solar feed-in tariff (the money you get for exporting excess solar back to the grid) essentially dropped to zero across Victoria.

What does this mean for you? It means the days of installing a solar system just to sell power back to the retailer are over. Today, the only way to genuinely smash your power bills is to generate, store, and consume your own electricity.

Here is a straightforward, factual guide to calculating exactly how much a solar and battery system can save your household.

Step 1: Find Your Current Daily Usage and Rate

Grab your most recent electricity bill. You need to look for two specific numbers:

1. Your Usage Rate: The cost you pay per kilowatt-hour (kWh). In Melbourne, this is typically around $0.30 (30 cents).

2. Your Daily Usage: How much electricity you use per day. A typical Melbourne family home uses roughly 20 kWh per day.

If you don't have solar yet, your daily usage cost is simply: 20 kWh x $0.30 = $6.00 per day (excluding your fixed daily supply charge).

Step 2: Calculate Your Solar "Self-Consumption" Savings

A standard 6.6kW solar panel system in Melbourne generates an average of 25 kWh of electricity per day.

However, you can only use that power while the sun is shining. Most households naturally consume about 40% of their daily power (8 kWh) during the day for things like fridges, washing machines, and standby appliances.

• Daytime power used directly from solar: 8 kWh

• Daytime savings: 8 kWh x $0.30 = $2.40 saved per day.

Step 3: Calculate the Battery Storage Advantage

Without a battery, the remaining 17 kWh of solar energy you generated is exported to the grid for pennies (averaging just 1c to 3c per kWh in 2026), and you are forced to buy expensive power back from the grid as soon as the sun sets.

By adding a 10kWh home battery, you capture that excess daytime solar and use it for your evening cooking, heating, cooling, and entertainment.

• Nighttime power supplied by battery: 10 kWh

• Nighttime savings: 10 kWh x $0.30 = $3.00 saved per day.

Step 4: Add It All Up

Let's look at the financial reality of this typical Melbourne home scenario:

• Grid-Only Cost: $6.00 / day ($2,190 per year)

• Solar + Battery Savings: $2.40 (Day) + $3.00 (Night) = $5.40 saved per day

• New Estimated Annual Savings: $1,971 per year!

(Note: You will still have a small daily supply charge to remain connected to the grid, but your usage costs will be practically wiped out).

Why Product Quality Dictates Your Savings

Calculations look great on paper, but your actual return on investment depends entirely on the reliability and efficiency of the hardware you install.

At E³ Energy, we don't gamble with your property. Backed by over 12 years of electrical services experience in Australia and holding A-grade licences, we guarantee safe, optimized, and fast installations (typically within just 2 to 6 weeks).

We secure your savings by exclusively supplying top-tier tier 1 solar panels from Astronergy, Canadian Solar, Jinko, Trina Solar, and Risen. To store that power, we offer the absolute best in the business:

• Sigenergy: The undisputed #1 home battery in Australia, dominating market share through unmatched reliability, advanced safety features, and premium build quality.

• FOX ESS: Australia's most disruptive energy storage brand, experiencing massive growth by offering an incredible price-to-performance ratio without compromising on cutting-edge technology.

Stop Guessing, Start Saving Today

Ready to see exactly what a custom solar and battery system can do for your specific property? Don't wait until the Federal Rebate drops on May 1, 2026, to find out you missed out on thousands of dollars in savings!

Contact E³ Energy today for a personalized, no-obligation energy solution. Our A-grade experts will analyze your current electricity bills, assess your roof layout, and design a custom system—featuring industry-leading brands like Sigenergy and FOX ESS—that maximizes your return on investment. With our fast 2-to-6-week turnaround, you can start generating your own clean power almost immediately.