Solar System & Battery Sizing for 1,325 kWh/Month in Brisbane (QLD), Australia
Complete photovoltaic engineering breakdown for a 1,325 kWh/month (44.2 kWh/day) electricity profile in Brisbane (QLD), Australia (5.4 Peak Sun Hours/day).
Technical Specification Table — 1,325 kWh/Month Solar System (Brisbane (QLD), Australia)
| Monthly / Daily Electricity Consumption | 1,325 kWh/month (44.2 kWh/day) |
| Location Peak Sun Hours (PSH) | 5.4 hours/day (Brisbane (QLD), Australia) |
| Required PV System Size (80% Performance Ratio) | 10.56 kWp DC |
| Number of Solar Panels (440W N-Type Bifacial) | 24 panels |
| Roof Area Required | 49.2 m² (530 sq ft) |
| Recommended Hybrid Inverter Rating | 9.4 kW AC |
| Recommended LiFePO4 Battery Storage (85% DoD) | 33.8 kWh Nominal (28.7 kWh Usable) |
| Estimated Annual Output | 16,651 kWh/year (~1,388 kWh/month) |
| Estimated System Turnkey Cost (Before Tax Credits) | A$13,200 |
| Annual Electricity Bill Savings (@ A$0.31/kWh) | A$5,162/year (A$430/month) |
Frequently Asked Questions
How many solar panels are needed for 1,325 kWh per month in Brisbane (QLD), Australia?
With an average of 5.4 Peak Sun Hours per day in Brisbane (QLD), Australia and an 80% system performance ratio, a monthly usage of 1,325 kWh (44.2 kWh/day) requires a 10.56 kWp solar array, which equals 24 standard 440W N-Type solar panels occupying 49.2 m² (530 sq ft) of roof space.
What size solar battery bank do I need for 1,325 kWh/month?
To cover evening and overnight loads (65% of daily consumption at 85% LiFePO4 depth of discharge), a 33.8 kWh nominal (28.7 kWh usable) LiFePO4 battery bank paired with a 9.4 kW hybrid inverter is recommended.
How much money will a 10.56 kW solar system save in Brisbane (QLD), Australia?
Generating approximately 16,651 kWh per year at an average local tariff of A$0.31/kWh, the system saves A$5,162 per year (A$430/month) with an estimated payback period of 2.6 years.