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Extra info for Building-Mounted Photovoltaics

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19). Both versions of PVWatts have default parameters that can be changed by the user. 2). The default value for the cost of electricity can be adjusted to reflect the user’s actual rate. The main drawback of PVWatts is that predicted module performance is based on the voltage-temperature characteristics of crystalline silicon and produces conservative performance estimates for thin-film technologies. In the US, all modules must be UL Listed and meet any local requirements, such as those of the California Energy Commission, in addition to satisfying IEC standards.

A word of caution, however: It is recommended to use only those materials that are available from trade or industry groups, or governmental organizations such as IEA, EPIA, SEIA, IREC and others. Information from other sources may be skewed to promote sales, etc. films such as cadmium telluride, which are widely used in Europe. PV Sol appears to provide a more accurate simulation of thin-film performance that matches real-life performance than does PVWatts. P V Sol is very flexible and has the added advantage that it can be used for both grid-connected and stand-alone applications.

If extensive storage is required to protect high-value applications, the cost will be higher. Large-scale, grid-connected utility or commercial BMPV systems may be procured for as low as US$4,000 to US$5,000 per installed KW, the improved price resulting from purchasing modules in quantity. PV prices are expected to continue dropping for the foreseeable future because of the now-plentiful supply of silicon. PV System Cost-effectiveness The cost-effectiveness of a PV system is often evaluated solely on the basis of the cost of electricity from competing energy sources, usually the utility grid.

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Building-Mounted Photovoltaics by Pira International Ltd

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