Solar System & Battery Sizing for 12,000 kWh/Month in Bristol, United Kingdom
Complete photovoltaic engineering breakdown for a 12,000 kWh/month (400.0 kWh/day) electricity profile in Bristol, United Kingdom (3.5 Peak Sun Hours/day).
Technical Specification Table — 12,000 kWh/Month Solar System (Bristol, United Kingdom)
| Monthly / Daily Electricity Consumption | 12,000 kWh/month (400.0 kWh/day) |
| Location Peak Sun Hours (PSH) | 3.5 hours/day (Bristol, United Kingdom) |
| Required PV System Size (80% Performance Ratio) | 143.0 kWp DC |
| Number of Solar Panels (440W N-Type Bifacial) | 325 panels |
| Roof Area Required | 666.2 m² (7,171 sq ft) |
| Recommended Hybrid Inverter Rating | 127.7 kW AC |
| Recommended LiFePO4 Battery Storage (85% DoD) | 305.9 kWh Nominal (260.0 kWh Usable) |
| Estimated Annual Output | 146,146 kWh/year (~12,179 kWh/month) |
| Estimated System Turnkey Cost (Before Tax Credits) | £264,550 |
| Annual Electricity Bill Savings (@ £0.28/kWh) | £40,921/year (£3,410/month) |
Frequently Asked Questions
How many solar panels are needed for 12,000 kWh per month in Bristol, United Kingdom?
With an average of 3.5 Peak Sun Hours per day in Bristol, United Kingdom and an 80% system performance ratio, a monthly usage of 12,000 kWh (400.0 kWh/day) requires a 143.0 kWp solar array, which equals 325 standard 440W N-Type solar panels occupying 666.2 m² (7171 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 127.7 kW hybrid inverter is recommended.
How much money will a 143.0 kW solar system save in Bristol, United Kingdom?
Generating approximately 146,146 kWh per year at an average local tariff of £0.28/kWh, the system saves £40,921 per year (£3,410/month) with an estimated payback period of 6.5 years.