Germany-based Solarwatt’s M250-60 AC 245Wp module has come top in the TÜV Rheinland “Energy Yield Test 2011”, which tests the performance of solar modules from different manufacturers.
The modules were tested for a year under outdoor installation conditions and were regularly checked for energy yield and other properties, such as degradation.
Solarwatt’s module exceeded its performance promise — although the label stated 245 Wp, the module achieved 246.73 Wp according to the company's own measurements. TÜV Rheinland measured an output of 246.5 Wp.
The module also achieved a low degradation value of 0.2%.