Either reference cells or pyranometers are used for solar irradiation measurements. Under irradiation, reference cells generate specific voltages at specific irradiation levels and temperature. A data logger records the voltages that are calibrated under the reference spectrum at STC according to IEC 60904-1. Referance cell: These encapsulated small solar cells Read more…
Depending on utility metering, the electricity bill shows how much electricity the owner obtains from the grid and how much electricity the solar system delivers to the grid. There is no detailed information about energy production of the solar PV system. To determine the overall energy production and behaviour of Read more…
Power generation, plant performance and, hence, project cash flow do not depend only on the chosen equipment. The main factors discussed in this section are:» system design: loss parameters, DC-to-AC ratio, monitoring and control system» maintenance: response times, scope of work aligned to local conditions, cleaning cycles» demand-driven generation versus Read more…
The basis for safe and reliable operation is proper planning and installation of the solar PV system. The system developer and installer should possess in-depth knowledge of the applicable (IEC) standardsFor roof-mounted PV installations, all safety precautions for working on rooftops have to be taken to provide a safe workplace.Due Read more…
Residential systems could be targets for theft. The solar PV modules themselves are the prime target, followed by copper, for example in the cables. Various theft protection measures are available on the market.A simple measure is to use custom-locking fasteners instead of standard bolts on the mounting rails. Sensor-based alarm Read more…
More recently, solar PPAs have been observed in the market for SHSs, where developers take care of design, permitting, financing, installation and operation of an SHS at the customer’s rooftop or nearby plot, at little or even no cost for the customer. The developer then sells the solar PV electricity Read more…
KEY POINTS: Is the owner of the roof the owner of the solar PV system? Have you assessed the revenue streams or avoided costs of the project? Have you assessed system configuration options for a specific project? Are you aware of the costs of the different system configurations? Do you Read more…
The formula for calculating the electricity demand in kWh is: Demand = power consumption per hour x operating hours per day Equipment Power consumption Assumed operating hours per day No. of equipment Power consumption per day Lighting 25 W 3 h 5 375 Wh Lighting (LED) 6 W per Read more…
Site-specific criteria and trade-offsThe site-specific criteria are similar to the criteria covered in the privious blog roof requirement for a Solar system. At this stage, a key question might be how to mount the solar PV system on the roof and if a system should perhaps be elevated.Depending on the Read more…
The various types of commercially available solar PV modules, including their appearance, maximum efficiencies, manufacturers and possible module designs Module technology Maximum efficiency (manufacturer) Appearance Remarks mono-Si 21.5% (SunPower) homogeneous dark blue framed glass-foil and frameless glass-glass or foil- foil laminates Read more…