In this article, we release real data from a solar installation with only 8 solar panels on a mid-terrace house in the UK. We collecting data for 12 months starting in February 2020 until February 2021. Our research is useful for the consumers because they can evaluate how much energy they can generate from solar panels and how much they can save if they install energy storage.
The installation under rigorous examination has a 5kW Solis Hybrid Inverter, lithium-ion energy storage, and 285W solar panels.
Simplified diagram of the actual home installation. A 5.5Kw hybrid inverter remains permanently connected in parallel with the grid power supply. Lithium-ion batteries are charged from solar and low-cost electricity from the grid.
2280Watt PV Panels Installed on the Roof.
It might sound like a small number of panels but on sunny days there is enough electricity to offset 100% of the cost of electricity. The diagrams below illustrate the total energy production Vs consumption. It is important to take into account that part of the energy consumed (energy drawn from the national grid) was purchased at an “economy tariff ” £0.05/kWh.
Let make clear first some basic but important number for solar panels. An average house requires around 3-4kW of photovoltaics. 3kW requires 226sq.ft or around 20sq.m space, considering 355W monocrystalline panels. Form 1kW you should expect 850kWh – 950kWh per annum.
3kW produces approximately 2,700kWh, 4kW system generates 3,600kWh