Solar System & Battery Sizing for 1,125 kWh/Month in Christchurch, New Zealand
Complete photovoltaic engineering breakdown for a 1,125 kWh/month (37.5 kWh/day) electricity profile in Christchurch, New Zealand (4.3 Peak Sun Hours/day).
Technical Specification Table — 1,125 kWh/Month Solar System (Christchurch, New Zealand)
| Monthly / Daily Electricity Consumption | 1,125 kWh/month (37.5 kWh/day) |
| Location Peak Sun Hours (PSH) | 4.3 hours/day (Christchurch, New Zealand) |
| Required PV System Size (80% Performance Ratio) | 11.0 kWp DC |
| Number of Solar Panels (440W N-Type Bifacial) | 25 panels |
| Roof Area Required | 51.2 m² (551 sq ft) |
| Recommended Hybrid Inverter Rating | 9.8 kW AC |
| Recommended LiFePO4 Battery Storage (85% DoD) | 28.7 kWh Nominal (24.4 kWh Usable) |
| Estimated Annual Output | 13,812 kWh/year (~1,151 kWh/month) |
| Estimated System Turnkey Cost (Before Tax Credits) | NZ$23,100 |
| Annual Electricity Bill Savings (@ NZ$0.31/kWh) | NZ$4,282/year (NZ$357/month) |
Frequently Asked Questions
How many solar panels are needed for 1,125 kWh per month in Christchurch, New Zealand?
With an average of 4.3 Peak Sun Hours per day in Christchurch, New Zealand and an 80% system performance ratio, a monthly usage of 1,125 kWh (37.5 kWh/day) requires a 11.0 kWp solar array, which equals 25 standard 440W N-Type solar panels occupying 51.2 m² (551 sq ft) of roof space.
What size solar battery bank do I need for 1,125 kWh/month?
To cover evening and overnight loads (65% of daily consumption at 85% LiFePO4 depth of discharge), a 28.7 kWh nominal (24.4 kWh usable) LiFePO4 battery bank paired with a 9.8 kW hybrid inverter is recommended.
How much money will a 11.0 kW solar system save in Christchurch, New Zealand?
Generating approximately 13,812 kWh per year at an average local tariff of NZ$0.31/kWh, the system saves NZ$4,282 per year (NZ$357/month) with an estimated payback period of 5.4 years.