Energy data and air data for Luxemburg

last updated: 2025-01-22

Photovoltaic (PV) data Mersch/Luxembourg

The following PV data of 4 units is showing that this form of energy is technically mature. The units (approx. 130 m²) are producing the double in energy needed. This includes the energy for heating (heatpump) and two electric cars.

The data is aimed to help comparing different PV units, and to give an overview of the solar radiation in Luxembourg.

As from 2022-2023

In 2022 I installed a battery (48 V, 60 kWh) and an 3 phase 24 kVA energy storage system (ESS) from Victron.

A 4 kWp unit from 2002 on the east roof was disconnected from the grid in August 2022 and reconnected to the battery (DC-DC). In June 2023 I replaced the 4 kWp from 2002 on the south roof with a new 11 kWp unit (connected to the battery). I also added a 4.9 kWp unit on the garage (battery) and disconnected a 2.7 kWp unit from the grid and reconnected it to the battery.

So after 2023 four units (4 kWp, 2.7 kWp, 11 kWp and 4.9 kWp) are connected to the battery and one unit (10 kWp from 2017 is connected to the output of the ESS system (DC-AC, 3 phase).

Unit 2002: 4 kWp, angle of inclination 30° azimuth -75° (75° east) to battery
Unit 2008: 2.7 kWp angle of inclination 19° azimuth +15° (15° west) to battery
Unit 2017: 2x5 kWp angle of inclination 10° azimuth +90/-90° (east/west) to AC output ESS 3p
Unit 2023: 11 kWp, angle of inclination 45°, azimuth +15° (15° west) to battery
Unit 2023: 4.9 kWp, angle of inclination 45°, azimuth +15° (15° west) to battery

Before 2023

For the data on this page before 2023 (no battery):

Unit (WG) 2002: 4 kWp, angle of inclination 45°, azimuth +15° (15° west)
Unit (WP) 2002: 4 kWp, angle of inclination 30° azimuth -75° (75° east)
Unit (WK) 2008: 2.7 kWp angle of inclination 19° azimuth +15° (15° west)
Unit (AU) 2017: 2x5 kWp angle of inclination 10° azimuth +90/-90° (east/west)

Yearly data:

Monthly data:

Daily data:

Failures:

In August 2018, the inverter of the WK system died. Outage for 15 days. The outage amounts to around 150 kWh.
In 2016 there were some problems with the loggers. The daily values are therefore not complete.
On 16 January 2011, a module of the eastern plant went bye-bye due to a hotspot (plant WP). This went unnoticed until 21 April, as the second string continued to supply energy. On the same day, the module was replaced free of charge (warranty). The loss amounts to around 360 kWh.
On 06 August 2012, the inverter of the east system gave up. It was replaced on 22 August. The loss amounts to around 250 kWh.