FAQs Archive - Celtic Solar Sunshine Coast

Q: What sized battery do I need?

This depends on your household loads, the level of grid independence you seek, and your backup requirements during outages. Typical residential sizes range between 10kWh and 40kWh. We will determine the right size for you based on seasonal factors, your usage and your goals.

Q: What Batteries do you install?

We supply and install a range of reputable battery systems for single-phase and three-phase homes. We will advise you on the best battery solution for your household. Modern systems are often modular so their capacity can be increased to meet your specific energy needs. Our recommended products include Sungrow, Sigenergy and FranklinWH.

Q: How much roof space do I need for a 10kW system?

A modern 10kW system typically consists of 20 to 22 high-efficiency panels (465 - 500W per panel). This requires approximately 45 to 55 square metres of clear roof space, depending on the specific dimensions and wattage of the panels selected for your property. We use sophisticated design software to determine the most appropriate layout for your home.

Q: What is a solar inverter?

The inverter is the "brain" of your system, converting the DC electricity from your panels into the AC power used by your home. Inverter capacity is measured in “kW”. The higher the number the more power the inverter can provide to your appliances, reducing your reliance on the grid. We only install smart, grid-compliant inverters that allow for real-time monitoring and with proven performance.

Q: How much does a solar system cost on the Sunshine Coast?

Residential solar costs vary based on whether you choose a grid-connected or a fully independent off-grid setup. Typically, quality grid-connected systems (after STC rebates), without a battery, range from $7,500 for smaller houses to $20,000 for large family homes, but it depends on your energy needs. Full off-grid setups are more significant investments, ranging from $25,000 to $80,000 + depending on power requirements and site complexity.