Solar System & Battery Sizing for 975 kWh/Month in Bristol, United Kingdom
Complete photovoltaic engineering breakdown for a 975 kWh/month (32.5 kWh/day) electricity profile in Bristol, United Kingdom (3.5 Peak Sun Hours/day).
Technical Specification Table — 975 kWh/Month Solar System (Bristol, United Kingdom)
| Monthly / Daily Electricity Consumption | 975 kWh/month (32.5 kWh/day) |
| Location Peak Sun Hours (PSH) | 3.5 hours/day (Bristol, United Kingdom) |
| Required PV System Size (80% Performance Ratio) | 11.88 kWp DC |
| Number of Solar Panels (440W N-Type Bifacial) | 27 panels |
| Roof Area Required | 55.3 m² (595 sq ft) |
| Recommended Hybrid Inverter Rating | 10.6 kW AC |
| Recommended LiFePO4 Battery Storage (85% DoD) | 24.8 kWh Nominal (21.1 kWh Usable) |
| Estimated Annual Output | 12,141 kWh/year (~1,012 kWh/month) |
| Estimated System Turnkey Cost (Before Tax Credits) | £21,978 |
| Annual Electricity Bill Savings (@ £0.28/kWh) | £3,399/year (£283/month) |
Frequently Asked Questions
How many solar panels are needed for 975 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 975 kWh (32.5 kWh/day) requires a 11.88 kWp solar array, which equals 27 standard 440W N-Type solar panels occupying 55.3 m² (595 sq ft) of roof space.
What size solar battery bank do I need for 975 kWh/month?
To cover evening and overnight loads (65% of daily consumption at 85% LiFePO4 depth of discharge), a 24.8 kWh nominal (21.1 kWh usable) LiFePO4 battery bank paired with a 10.6 kW hybrid inverter is recommended.
How much money will a 11.88 kW solar system save in Bristol, United Kingdom?
Generating approximately 12,141 kWh per year at an average local tariff of £0.28/kWh, the system saves £3,399 per year (£283/month) with an estimated payback period of 6.5 years.