Home Battery 12 Months Later | My Real Power Bill Results

The comparison covers two different households

The video compares electricity bills from roughly 12 months apart, before and after home battery installation. The same battery system was installed at both homes, with each system described as having 25 kWh of storage.

The first home has four occupants, including two adults and two children. It also uses air conditioning, runs multiple servers and charges an electric vehicle. The second home belongs to two working adults who are generally away during weekdays. It has electric hot water, an electric oven and an electric cooktop, but no EV. Both homes already had solar before the battery was installed.

Four-person home: a large reduction in the bill

The earlier comparison bill for the first home was shown as $562, dated 8 April 2025. During that period, average usage was about 30.2 units per day. The household was using substantial power, including air conditioning, servers and EV charging.

The comparable bill roughly a year later was presented as $161.12, with average usage of about 10 units per day and an average cost of $2.56 per day. The transcript says similar bills have generally been around $140 to $160 every two months, although $160 was described as being towards the higher end.

The biggest change was during the expensive peak period on the Synergy EV add-on plan. The earlier bill included $255 in peak charges between approximately 3 pm and 9 pm. In the newer bill, the equivalent peak charge was $5.89. The remaining peak cost was attributed to occasional battery depletion while air conditioning was still running, rather than EV charging.

How the annual savings were calculated

The video estimates the first household’s electricity cost before the battery at roughly $3,016 per year, or about $251 per month. After installation, the home electricity cost was estimated at about $720 per year, or $60 per month.

The calculation excludes roughly $40 per month of EV charging so the comparison focuses on household electricity use. It also notes that fixed supply charges continue regardless of whether a battery is installed. The video treats the excluded EV cost and fixed charges as broadly offsetting for the purpose of the comparison, while acknowledging that this is not exact.

On that basis, the estimated electricity saving is about $2,296 per year, or $191 per month. An interest-free battery loan repayment of approximately $83 per month reduces the ongoing cash-flow benefit to about $108 per month while the loan remains active. An upfront payment of around $3,400 would be recovered in approximately 31 months using that net figure. Using the stated full system cost of $13,400 against the annual electricity saving gives an estimated payback period of about 5.8 years.

Two-person home: usage charges almost disappear

The parents’ earlier bill, dated March 2025, was $489. The video describes this as being towards the lower end of their bills, with other bills reaching approximately $680. Their average usage was about 29 units per day, and the usage component of the bill was approximately $381 before supply charges and solar credits.

Around a year later, their bill was $79.95. Average daily usage was listed as 0.39 units, and the average daily cost was described as $1.29. Only $7.27 over the 60-day period was attributed to power drawn from the grid, with most of the remaining bill consisting of the connection and supply charge.

A few hot days required more air conditioning, but the battery was reportedly still not falling below 40 per cent after a newer small air conditioner was installed. Most days, it was said to remain at approximately 60 to 70 per cent. This suggests the system was larger than the household’s current requirements, although future household changes could increase its usefulness.

What the examples show

The results illustrate why battery value depends on a home’s daily schedule. Solar generation occurs during the day, while households often use the most electricity after returning home, when solar output has declined and peak tariffs may apply.

The comparison is not a controlled test. Household occupancy, appliance use, air conditioning, EV charging, weather and electricity prices can all change between years. The video also assumes energy prices remain broadly similar when estimating payback. Fixed supply charges remain unavoidable, even when grid energy usage is reduced to almost zero.