Abstract: A method for assessing solar cells having one or more light sources that are fastened to a fastening device, with the light sources movably fastened to the fastening device and/or a light intensity control, provided with which the light intensity of each light source can be changed independently of the other light sources, with a camera fastened to the fastening device, the method including: the fastening device is aligned relative to solar cells by the camera so that the camera axis of the camera is substantially perpendicular to the surface of the solar cells to be assessed, the light sources are aligned and/or the light intensity of the light sources are controlled that the solar cells are illuminated substantially uniformly, following the illumination that is substantially uniform, a photo of the solar cells is taken with the camera, the solar cells are assessed using the photo.

Abstract: A control system includes one or more levels of control of power and energy. At one level, a first controller optimally divides power between two or more processes, to maximize instantaneous production, for a given amount of currently available power. In the case of EDR desalination, electric power is optimally divided between ion exchange membranes and pumps to maximize instantaneous production of desalinated water for a given amount of available electric power. Optionally, at another level, a second controller divides time-varying power between the processes fed by the first level controller and an energy storage unit, based on a prediction of future power availability and a function. In the EDR case, power generated by a photovoltaic array is divided between the EDR desalination process and a battery, based on a prediction of future PV power availability and a function, to ensure reliable water production in the future.

Abstract: A solar spectrum sensor, a consumer device and a method for determining an ambient solar spectrum. The solar spectrum sensor comprises a sensor unit configured for generating respective photo current outputs responsive to different parts of the solar spectrum; a measurement unit configured for measuring the respective photo current outputs from the sensor unit; and a processing unit for determining an average photon energy, APE, value of the solar spectrum from the measured photo current outputs and for determining the solar spectrum based on the determined APE.

Abstract: A solar spectrum sensor, a consumer device and a method for determining an ambient solar spectrum. The solar spectrum sensor comprises a sensor unit configured for generating respective photo current outputs responsive to different parts of the solar spectrum; a measurement unit configured for measuring the respective photo current outputs from the sensor unit; and a processing unit for determining an average photon energy, APE, value of the solar spectrum from the measured photo current outputs and for determining the solar spectrum based on the determined APE.