Solar System & Battery Sizing for 300 kWh/Month in Cologne (NRW), Germany
Complete photovoltaic engineering breakdown for a 300 kWh/month (10.0 kWh/day) electricity profile in Cologne (NRW), Germany (3.3 Peak Sun Hours/day).
Technical Specification Table — 300 kWh/Month Solar System (Cologne (NRW), Germany)
| Monthly / Daily Electricity Consumption | 300 kWh/month (10.0 kWh/day) |
| Location Peak Sun Hours (PSH) | 3.3 hours/day (Cologne (NRW), Germany) |
| Required PV System Size (80% Performance Ratio) | 3.96 kWp DC |
| Number of Solar Panels (440W N-Type Bifacial) | 9 panels |
| Roof Area Required | 18.4 m² (198 sq ft) |
| Recommended Hybrid Inverter Rating | 3.5 kW AC |
| Recommended LiFePO4 Battery Storage (85% DoD) | 7.6 kWh Nominal (6.5 kWh Usable) |
| Estimated Annual Output | 3,816 kWh/year (~318 kWh/month) |
| Estimated System Turnkey Cost (Before Tax Credits) | €6,534 |
| Annual Electricity Bill Savings (@ €0.35/kWh) | €1,323/year (€110/month) |
Frequently Asked Questions
How many solar panels are needed for 300 kWh per month in Cologne (NRW), Germany?
With an average of 3.3 Peak Sun Hours per day in Cologne (NRW), Germany and an 80% system performance ratio, a monthly usage of 300 kWh (10.0 kWh/day) requires a 3.96 kWp solar array, which equals 9 standard 440W N-Type solar panels occupying 18.4 m² (198 sq ft) of roof space.
What size solar battery bank do I need for 300 kWh/month?
To cover evening and overnight loads (65% of daily consumption at 85% LiFePO4 depth of discharge), a 7.6 kWh nominal (6.5 kWh usable) LiFePO4 battery bank paired with a 3.5 kW hybrid inverter is recommended.
How much money will a 3.96 kW solar system save in Cologne (NRW), Germany?
Generating approximately 3,816 kWh per year at an average local tariff of €0.35/kWh, the system saves €1,323 per year (€110/month) with an estimated payback period of 4.9 years.