SunnyvilleSOLAR

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Townsville & North Queensland

Solar & battery.
Savings calculator.

3 simple steps to see your savings.

SUNNYVILLESOLAR

Townsville solar & batteries
Your savings calculator

Includes about $54.15 in fees. Details

Enter your total monthly electricity bill, including the service charge. For this estimate, use what you would pay without solar, before rebates.

Ergon’s Tariff 11 service charge is $1.80508/day, or about $54.15 for 30 days. The actual amount depends on the number of days. You can change the fee below.

Check Ergon’s published rates ↗

Daytime · 50%Night-time · 50%

Move the slider. More on one side means less on the other.

Used in the day
Used at night

3Choose your system

Solar panels
Battery storage

The battery saves spare solar for night. We allow 11.2 kWh from the small battery or 22.4 kWh from the large one each day.

Change electricity rates & service fee

Starting rates: buy at 28.895 cents/kWh (including GST); sell at 6.006 cents/kWh. Buying rate based on Ergon Tariff 11 from 1 July 2026. You can use the rates from your own bill.

Your new bill
Estimated
$150.00 / month

Your savings: $0.00 / month

Your home uses
Your panels make
Your monthly savings
Bill before solar
1. Daytime savings
2. Night-time savings
3. Sell leftover solar
Your new bill
Get a quote

Your savings

Every month
Every year
Over 10 years

Bill savings only, before system purchase and finance costs. The 10-year figure is monthly savings × 120, with unchanged rates, usage and production.

How this calculator works

The starting bill assumes no solar or battery. We subtract the monthly service fee, divide the remainder by the buying rate, and split that energy into day and night using your slider. We use an average month of 365 ÷ 12 days.

Daily solar production is fixed at 30 kWh for 6.6 kW and 60 kWh for 13.3 kW. Solar first covers daytime use. Remaining solar supplies the battery, up to 11.2 or 22.4 kWh and no more than your night-time demand. Only the solar left after both uses earns an export credit. Energy is never counted twice. The service fee remains in the bill; export credits may offset it.

This is a simplified daily energy balance, not a roof assessment or hourly forecast. It assumes daytime solar and demand coincide, battery energy shifts to night on a one-for-one basis, and all leftover solar can be exported. Weather, seasonal variation, battery conversion losses, power limits, export restrictions and degradation are not modelled. Actual savings can be lower. A battery with no solar has no savings in this model. An existing system’s post-solar bill cannot be used as the starting bill.