Solar System & Battery Sizing for 12,000 kWh/Month in Arizona, USA
Complete photovoltaic engineering breakdown for a 12,000 kWh/month (400.0 kWh/day) electricity profile in Arizona, USA (6.4 Peak Sun Hours/day).
Technical Specification Table — 12,000 kWh/Month Solar System (Arizona, USA)
| Monthly / Daily Electricity Consumption | 12,000 kWh/month (400.0 kWh/day) |
| Location Peak Sun Hours (PSH) | 6.4 hours/day (Arizona, USA) |
| Required PV System Size (80% Performance Ratio) | 78.32 kWp DC |
| Number of Solar Panels (440W N-Type Bifacial) | 178 panels |
| Roof Area Required | 364.9 m² (3,928 sq ft) |
| Recommended Hybrid Inverter Rating | 69.9 kW AC |
| Recommended LiFePO4 Battery Storage (85% DoD) | 305.9 kWh Nominal (260.0 kWh Usable) |
| Estimated Annual Output | 146,364 kWh/year (~12,197 kWh/month) |
| Estimated System Turnkey Cost (Before Tax Credits) | $191,884 |
| Annual Electricity Bill Savings (@ $0.15/kWh) | $21,955/year ($1,830/month) |
Frequently Asked Questions
How many solar panels are needed for 12,000 kWh per month in Arizona, USA?
With an average of 6.4 Peak Sun Hours per day in Arizona, USA and an 80% system performance ratio, a monthly usage of 12,000 kWh (400.0 kWh/day) requires a 78.32 kWp solar array, which equals 178 standard 440W N-Type solar panels occupying 364.9 m² (3928 sq ft) of roof space.
What size solar battery bank do I need for 12,000 kWh/month?
To cover evening and overnight loads (65% of daily consumption at 85% LiFePO4 depth of discharge), a 305.9 kWh nominal (260.0 kWh usable) LiFePO4 battery bank paired with a 69.9 kW hybrid inverter is recommended.
How much money will a 78.32 kW solar system save in Arizona, USA?
Generating approximately 146,364 kWh per year at an average local tariff of $0.15/kWh, the system saves $21,955 per year ($1,830/month) with an estimated payback period of 8.7 years.