Solar System & Battery Sizing for 1,250 kWh/Month in Cologne (NRW), Germany
Complete photovoltaic engineering breakdown for a 1,250 kWh/month (41.7 kWh/day) electricity profile in Cologne (NRW), Germany (3.3 Peak Sun Hours/day).
Technical Specification Table — 1,250 kWh/Month Solar System (Cologne (NRW), Germany)
| Monthly / Daily Electricity Consumption | 1,250 kWh/month (41.7 kWh/day) |
| Location Peak Sun Hours (PSH) | 3.3 hours/day (Cologne (NRW), Germany) |
| Required PV System Size (80% Performance Ratio) | 15.84 kWp DC |
| Number of Solar Panels (440W N-Type Bifacial) | 36 panels |
| Roof Area Required | 73.8 m² (794 sq ft) |
| Recommended Hybrid Inverter Rating | 14.1 kW AC |
| Recommended LiFePO4 Battery Storage (85% DoD) | 31.9 kWh Nominal (27.1 kWh Usable) |
| Estimated Annual Output | 15,263 kWh/year (~1,272 kWh/month) |
| Estimated System Turnkey Cost (Before Tax Credits) | €26,136 |
| Annual Electricity Bill Savings (@ €0.35/kWh) | €5,342/year (€445/month) |
Frequently Asked Questions
How many solar panels are needed for 1,250 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 1,250 kWh (41.7 kWh/day) requires a 15.84 kWp solar array, which equals 36 standard 440W N-Type solar panels occupying 73.8 m² (794 sq ft) of roof space.
What size solar battery bank do I need for 1,250 kWh/month?
To cover evening and overnight loads (65% of daily consumption at 85% LiFePO4 depth of discharge), a 31.9 kWh nominal (27.1 kWh usable) LiFePO4 battery bank paired with a 14.1 kW hybrid inverter is recommended.
How much money will a 15.84 kW solar system save in Cologne (NRW), Germany?
Generating approximately 15,263 kWh per year at an average local tariff of €0.35/kWh, the system saves €5,342 per year (€445/month) with an estimated payback period of 4.9 years.