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Use of Solar Photo Voltaic Modules in our lives
Solar Photo Voltaic Modules are best known as a method for generating electric power by using solar cells to convert energy from the sun into electricity. The photovoltaic effect refers to photons of light knocking electrons into a higher state of energy to create electricity.
In buildings:
Building-integrated photovoltaic (BIPV) are increasingly incorporated into new domestic and industrial buildings as a principal or ancillary source of electrical power, and are one of the fastest growing segments of the photovoltaic industry. Typically, an array is incorporated into the roof or walls of a building and roof tiles with integrated PV cells can now be purchased. Arrays can also be retrofitted into existing buildings; in this case they are usually fitted on top of the existing roof structure. Alternatively, an array can be located separately from the building but connected by cable to supply power for the building.
Where a building is at a considerable distance from the public electricity supply (or grid) - in remote or mountainous areas – PV may be the preferred possibility for generating electricity, or PV may be used together with wind, diesel generators and/or hydroelectric power. In such off-grid circumstances batteries are usually used to store the electric power.
In locations near the grid, however, feeding the grid using PV panels is more practical, and leads to optimum use of the investment in the photovoltaic system. This requires both regulatory and commercial preparation, including net-metering and feed-in agreements. To provide for possible power failure, some grid tied systems are set up to allow local use disconnected from the grid. Most photovoltaic are grid connected. In the event the grid fails, the local system must not feed the grid to prevent the possible creation of dangerous islanding.
The power output of photovoltaic systems for installation in buildings is usually described in kilowatt-peak units (kWp).
In transport:
PV has traditionally been used for auxiliary power in space. PV is rarely used to provide motive power in transport applications, but is being used increasingly to provide auxiliary power in boats and cars. Recent advances in solar race cars, however, have produced cars that with little changes could be used for transportation.
Standalone devices:
Until a decade or so ago, PV was used frequently to power calculators and novelty devices. Improvements in integrated circuits and low power LCD displays make it possible to power such devices for several years between battery changes, making PV use less common. In contrast, solar powered remote fixed devices have seen increasing use recently in locations where significant connection cost makes grid power prohibitively expensive. Such applications include parking meters, emergency telephones, temporary traffic signs, and remote guard posts & signals.
Rural electrification:
Developing countries where many villages are often more than five kilometers away from grid power have begun using photovoltaic. In remote locations in India a rural lighting program has been providing solar powered LED lighting to replace kerosene lamps. The solar powered lamps were sold at about the cost of a few months’ supply of kerosene. Cuba is working to provide solar power for areas that are off grid. These are areas where the social costs and benefits offer an excellent case for going solar though the lack of profitability could relegate such endeavors to humanitarian goals.
About the Author
Surya Prakash Singh is the author of Use of Solar Photo Voltaic Modules in our lives. Solar Water Pumping System, Solar Power Fencing, Solar Photo Voltaic Module .
PHP (fatal error : cannot redeclare) when installing ZenCart Module?
I am installing a payment module in zencart... but keep getting an error with the php code... the error says:
Fatal error: Cannot redeclare class pj in /.../includes/modules/payment/pj.php on line 433
# function keys() {
# return array('MODULE_PAYMENT_PJ_STATUS', 'MODULE_PAYMENT_PJ_COLLECT_CVV', 'MODULE_PAYMENT_PJ_EMAIL', 'MODULE_PAYMENT_PJ_ZONE', 'MODULE_PAYMENT_PJ_ORDER_STATUS_ID', 'MODULE_PAYMENT_PJ_SORT_ORDER');
# }
# }
# ?>
Can anyone help?
It means that somewhere in zencart they have defined a class called "pj". This module you are trying to install has also created a "pj" declaration (or trying to reinclude it) and the two are conflicting.
It would be like you creating a class called "Car" and defining what makes up a car. Then later you include a file that also defines a "Car" class with different functionality. How is PHP suppose to know which Car class to use when it sees two different versions?
So look for a place where pj.php might be included more than once. I am not sure what you are showing there was line 433 or not but that appears to have nothing to do with the error.
Hope you find the problem given this new information. 
Keithley's Ultra-Fast Current-Voltage System Combines Three Essential Characterization Capabilities In One Chassis
Keithley Instruments, Inc., a world leader in advanced electrical test instruments and systems, today introduced the Model 4225-PMU Ultra Fast I-V Module, the latest addition to the growing range of instrumentation options for the Model 4200-SCS Semiconductor Characterization System
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