# SunnyWatly > Smarter Energy Calculators for Australia ## Posts - [6.6kW Solar System Australia: Output, Panel Count and Savings in 2026](https://sunnywatly.com/blog/6-6kw-solar-system-australia/): A practical guide to 6.6kW solar systems in Australia, including panel count, output, bill savings and when a larger system may suit better. - [10kW Solar System Australia: Output, Panel Count and Savings in 2026](https://sunnywatly.com/blog/10kw-solar-system-australia/): Estimate 10kW solar output, panel count, savings and payback in Australia, with practical sizing questions to ask before installation. - [Solar Calculator Australia: How to Estimate Solar Output, Savings and Payback](https://sunnywatly.com/blog/solar-calculator-australia/): Learn how an Australian solar calculator estimates generation, self-consumption, bill savings and payback—and which inputs matter most. - [Solar Rebate Australia 2026: STCs, Eligibility and How the Discount Works](https://sunnywatly.com/blog/solar-rebate-australia-2026/): Learn how Australia's solar rebate works through STCs, what affects the discount and what to check before accepting a rooftop solar quote. - [Solar Battery Australia 2026: Costs, Sizes, Rebate and Payback](https://sunnywatly.com/blog/solar-battery-australia-2026/): An Australia-focused solar battery guide covering sizing, cost drivers, federal support, payback and what to compare before installing. - [Home Battery Australia 2026: Sizes, Costs, Savings and What to Compare](https://sunnywatly.com/blog/home-battery-australia-2026/): Compare home battery sizes, usable capacity, savings drivers, backup features and rebate considerations for Australian homes in 2026. - [Cheaper Home Batteries Program 2026: How the Federal Battery Discount Works](https://sunnywatly.com/blog/cheaper-home-batteries-program-2026/): A practical 2026 guide to Australia's Cheaper Home Batteries Program, STCs, battery-size tiers and the questions to ask before buying. - [Battery Rebate Australia 2026: Federal Discount, Eligibility and What Changed](https://sunnywatly.com/blog/battery-rebate-australia-2026/): Understand Australia's 2026 federal battery rebate, eligibility, May 2026 changes and how the Cheaper Home Batteries Program discount works. ## Pages - [What Size Solar Battery Do I Need?](https://sunnywatly.com/guides/what-size-solar-battery-do-i-need/): Battery size should follow evening and overnight consumption, backup goals and the amount of excess solar available to recharge it. - [Solar Self-Consumption Explained](https://sunnywatly.com/guides/solar-self-consumption-australia/): Solar self-consumption is the share of solar generation used on-site instead of exported. It is one of the strongest drivers of rooftop-solar bill savings. - [Solar Payback Period Australia](https://sunnywatly.com/guides/solar-payback-period-australia/): Solar payback is driven by installed cost, annual generation, self-consumption, retail tariffs and export value. It should be treated as a range, not a gua - [Solar Panels Sydney: Output & Sizing Guide](https://sunnywatly.com/guides/solar-panels-sydney/): The Australian Government lists typical Sydney solar generation at about 4.0 kWh per installed kW per day averaged over a year. - [Solar Panels Perth: Output & Sizing Guide](https://sunnywatly.com/guides/solar-panels-perth/): The Australian Government lists typical Perth solar generation at about 4.4 kWh per installed kW per day averaged over a year. - [Solar Panels Melbourne: Output & Sizing Guide](https://sunnywatly.com/guides/solar-panels-melbourne/): The Australian Government lists typical Melbourne solar generation at about 3.6 kWh per installed kW per day averaged over a year. - [Solar Panels Brisbane: Output & Sizing Guide](https://sunnywatly.com/guides/solar-panels-brisbane/): The Australian Government lists typical Brisbane solar generation at about 4.2 kWh per installed kW per day averaged over a year. - [Solar Panels Adelaide: Output & Sizing Guide](https://sunnywatly.com/guides/solar-panels-adelaide/): The Australian Government lists typical Adelaide solar generation at about 4.2 kWh per installed kW per day averaged over a year. - [Solar Panel Cost Australia 2026](https://sunnywatly.com/guides/solar-panel-cost-australia-2026/): Solar pricing varies with system size, hardware, roof complexity, switchboard work and installer scope. Use quote inclusions—not price alone—to compare off - [Solar Feed-in Tariffs Australia](https://sunnywatly.com/guides/solar-feed-in-tariffs-australia/): Feed-in tariffs are credits for exported solar electricity and vary by retailer, state, plan and time. They are generally lower than retail import rates. - [Solar Export Limits Australia](https://sunnywatly.com/guides/solar-export-limits-australia/): Distribution networks can limit how much rooftop solar is exported to the grid. Limits can be fixed, zero-export or dynamic depending on network and connec - [Solar Battery Cost Australia 2026](https://sunnywatly.com/guides/solar-battery-cost-australia-2026/): Battery quotes vary widely with usable capacity, inverter architecture, backup capability, switchboard work and incentive treatment. - [Is a Solar Battery Worth It in Australia?](https://sunnywatly.com/guides/is-a-solar-battery-worth-it-australia/): A battery can improve self-consumption and backup capability, but financial value varies heavily with tariffs, load timing, installed cost and incentive el - [How Many Solar Panels Do I Need? Australia](https://sunnywatly.com/guides/how-many-solar-panels-do-i-need-australia/): Panel count is determined by target array size and individual panel wattage, but roof layout decides what can actually be installed. - [EV vs Petrol Running Cost Australia](https://sunnywatly.com/guides/ev-vs-petrol-running-cost-australia/): Energy cost per kilometre can be compared using kWh/100 km for an EV and L/100 km for a petrol vehicle. - [EV Charging Cost at Home Australia](https://sunnywatly.com/guides/ev-charging-cost-australia/): Home EV charging cost is primarily battery energy required divided by charging efficiency, multiplied by the electricity rate that applies when you charge. - [Electricity Cost per kWh Australia 2026](https://sunnywatly.com/guides/electricity-cost-per-kwh-australia/): Electricity rates vary by state, distribution area, retailer and tariff structure, so there is no single Australian cents-per-kWh figure that fits every ho - [Cheaper Home Batteries Program 2026](https://sunnywatly.com/guides/cheaper-home-batteries-program/): The Australian Government program supports eligible small-scale battery installations through the SRES and is described as providing around a 30% discount - [Average Electricity Usage Australia](https://sunnywatly.com/guides/average-electricity-usage-australia/): Household energy use varies with household size, climate, gas versus electric appliances, pools, EVs and heating/cooling. - [Air Conditioner Running Cost Australia](https://sunnywatly.com/guides/air-conditioner-running-cost-australia/): Air-conditioner running cost depends on electrical input, operating hours, compressor load and your tariff—not simply the advertised cooling capacity. - [7kW vs 11kW vs 22kW EV Chargers](https://sunnywatly.com/guides/7kw-vs-11kw-vs-22kw-ev-charger/): Home charging speed is limited by both the EV charger and the vehicle onboard AC charger. Higher wallbox power is useful only when the electrical supply an - [6.6kW Solar System Australia](https://sunnywatly.com/guides/66kw-solar-system-australia/): A 6.6 kW array is a common residential size because it can pair with inverter configurations used on many homes, but its suitability depends on load, roof - [20kWh Home Battery Australia](https://sunnywatly.com/guides/20kwh-battery-australia/): A 20 kWh-class battery can suit larger homes, high evening usage, long backup targets or properties with substantial solar generation. - [15kW Solar System Australia](https://sunnywatly.com/guides/15kw-solar-system-australia/): A 15 kW residential-scale array may suit very high-load homes or properties electrifying transport and heating, subject to roof and network constraints. - [13.5kWh Home Battery Australia](https://sunnywatly.com/guides/135kwh-battery-australia/): A 13.5 kWh-class battery is a common comparison point in Australian residential storage because it can cover substantial overnight energy for many househol - [13.2kW Solar System Australia](https://sunnywatly.com/guides/132kw-solar-system-australia/): A 13.2 kW array can produce substantial annual energy, but self-consumption, inverter design and export constraints strongly affect its economic value. - [10kWh Home Battery Australia](https://sunnywatly.com/guides/10kwh-battery-australia/): A 10 kWh-class battery can cover a meaningful share of evening usage for many homes, depending on usable capacity and load timing. - [10kW Solar System Australia](https://sunnywatly.com/guides/10kw-solar-system-australia/): A 10 kW rooftop solar system can suit larger homes, high daytime loads, EV charging or battery plans. Roof area and connection limits can be decisive. - [Disclaimer](https://sunnywatly.com/disclaimer/): SunnyWatly calculations are estimates only. - [Terms of Use](https://sunnywatly.com/terms/): These Terms of Use apply when you access SunnyWatly. - [Cookie Policy](https://sunnywatly.com/cookies/): This Cookie Policy explains how SunnyWatly may use cookies and similar technologies. - [Privacy Policy](https://sunnywatly.com/privacy/): SunnyWatly provides energy calculators and educational content. This policy explains what information may be processed when you use the site. - [Contact](https://sunnywatly.com/contact/): Questions, corrections, partnership enquiries or feedback about SunnyWatly can be sent by email. - [Editorial Policy](https://sunnywatly.com/editorial-policy/): SunnyWatly aims to publish practical, source-aware energy information for Australian households and businesses. - [Methodology](https://sunnywatly.com/methodology/): SunnyWatly calculators are built around transparent, editable assumptions rather than hidden quote engines. - [About](https://sunnywatly.com/about/): SunnyWatly is an Australia-first energy tools and education platform built to make solar, battery, electricity and EV decisions easier to understand. - [Guides](https://sunnywatly.com/guides/): Australian solar, battery, electricity and EV explainers designed to sit alongside the calculators. - [EV vs Petrol Cost Calculator](https://sunnywatly.com/au/ev/ev-vs-petrol-cost-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [EV Charging Time Calculator](https://sunnywatly.com/au/ev/ev-charging-time-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [EV Charging Cost Calculator](https://sunnywatly.com/au/ev/ev-charging-cost-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Air Conditioner Running Cost Calculator](https://sunnywatly.com/au/electricity/air-conditioner-running-cost-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Electricity Cost Calculator](https://sunnywatly.com/au/electricity/electricity-cost-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Battery Rebate Calculator Australia](https://sunnywatly.com/au/battery/battery-rebate-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Battery Payback Calculator](https://sunnywatly.com/au/battery/battery-payback-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Battery Size Calculator Australia](https://sunnywatly.com/au/battery/battery-size-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Solar Payback Calculator](https://sunnywatly.com/au/solar/solar-payback-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Solar Output Calculator](https://sunnywatly.com/au/solar/solar-output-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Solar Panel Calculator](https://sunnywatly.com/au/solar/solar-panel-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Solar System Size Calculator](https://sunnywatly.com/au/solar/solar-system-size-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [Solar Savings Calculator Australia](https://sunnywatly.com/au/solar/solar-savings-calculator/): Enter your own usage, tariff, quote or hardware details. Results are estimates only; check technical constraints and current program rules before acting. - [EV Calculators Australia](https://sunnywatly.com/au/ev/): Estimate EV charging cost, charging time and EV-versus-petrol running cost using your vehicle, charger and electricity assumptions. - [Electricity Calculators Australia](https://sunnywatly.com/au/electricity/): Estimate household electricity use and running costs using your appliance power, operating time and electricity tariff. - [Battery Calculators Australia](https://sunnywatly.com/au/battery/): Estimate battery size, simple payback and federal battery STC support. - [Solar Calculators Australia](https://sunnywatly.com/au/solar/): Estimate solar output, system size, panel quantity, savings and payback using editable assumptions. - [Australia Energy Tools](https://sunnywatly.com/au/): Free Australia-first calculators for solar, batteries, electricity and EV charging. - [Blog](https://sunnywatly.com/blog/) - [Home](https://sunnywatly.com/) [comment]: # (Generated by Hostinger Tools Plugin)