The system aims to ensure continuous power supply throughout the year while minimizing the levelized cost of energy (LCOE). The design complies with Australian Standard AS/NZS4509.

Key Design Elements:

1. Load Assessment
   • Energy consumption is analyzed for AC and DC loads in summer and winter.
   • Average daily load: 38.62 kWh/day.
2. Battery Sizing and Selection
   • System voltage: 48V with autonomy for 4 days.
   • Greensun 200Ah 48V LiFePo4 battery chosen for cost-effectiveness and 6000 life cycles.
3. Solar Panel Configuration
   • Panels: Trina Solar TSM-510DE18M (Efficiency: 20.7%).
   • Optimal tilt angle: 60° for maximizing insolation in July, the month with the least solar radiation.
4. Hybrid Inverter Selection
   • Growatt SPF8KTHVM hybrid inverter chosen for its compatibility and high efficiency.
5. DC/DC Converter Design
   • Helios Power DCW100-24FT-P9200 and DCW500-48-12FT converters used for 24V and 12V DC loads.
6. System Safety and Surge Protection
   • Designed per AS/NZS4509 standards, with proper cabling, surge protection devices, and battery management systems to ensure safe and reliable operation.
7. Cost Estimation
   • Component cost and labor were detailed with an estimated total project cost of AUD 115,793, including a 20% margin.
   • Installation to be completed within 21 days by a team of technicians and electricians.
8. PV Performance Analysis
   • Annual energy yield: 36,055.22 kWh.
   • Performance ratio: 72.07%.
   • Specific yield: 1.01 kWh/kWp.
9. Economic Analysis
   • Estimated payback period: 61.3 years.
   • Levelized Cost of Electricity (LCOE): AUD 0.25/kWh, comparable to grid electricity in remote areas.

Key Observations and Recommendations:

1. Load Management:
   While the design effectively addresses energy requirements, reducing AC surge loads (e.g., through efficient appliances or load scheduling) could further optimize battery and inverter sizing.
2. Battery Bank:
   The choice of LiFePO4 is excellent for longevity and efficiency. Consider future-proofing by designing for modular battery bank expansion.
3. Economic Feasibility:
   The long payback period is typical for off-grid systems. Financial incentives, grants, or carbon credits could improve economic viability.
4. Insolation Data Accuracy:
   Monthly and annual insolation data seem consistent with site conditions. A site-specific weather station could improve future performance monitoring.
5. Environmental Impact:
   Consider including a life cycle assessment of the selected components to strengthen the report’s sustainability claims.