Welcome to Solar Photovoltaic Solutions
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There are many energy sources, some renewable some not, Lormark can tailor a solution
for your needs using the sun, utility (Eskom) stored or diesel. The
sun forms two distinct sources warmth for solar thermal generation and light for
electrical power (photovoltaic). All are useful and products and solutions described here utilize
all forms of available energy.
The most efficient method of generating energy must be employed in any application
to ensure energy and hence the cost is optimised. These products all achieve this
goal and each has a unique application. Eskom and other utilities do not always have an economic solution or even a reliable solution to
provide power for your needs. Lormark will optimise the best solution for your needs in urban or remote locations.
A brief synopsis of solar energy
Solar power is divided into two categories, thermal and photovoltaic (PV). The PV is the one used to convert sun light into electricity. The output power is directly related to the suns power and will vary with the time of day, the season and the shading or cloud cover. In order to stabilise the output power for a solar PV array there needs to be some means of storage to provide an even average output irrespective of cloud cover and the time of day.
The two most common ways of doing this are battery backed and grid tied systems. The grid tied system uses the power utility as the "battery bank" and feeds power into the grid when there is a surplus and draws from the grid when there solar cannot provide the additional demand. This power flow happens instantaneously in either direction without any interruptions.
Power is measure in Watts (W) and is an instantaneous measure of what is available and/or used. The more common method of describing power is the average provided or used and this is the watt hours (Wh), utilities measure and pay on this value, ( Defined as one watt consumed/generated for one hour).
Inverters are used to convert the solar panel power from a direct current (DC) to the utilities grid standard 230V alternating current (AC) at 50Hz. With a grid tied system the inverters mimic the incoming waveforms to provide seamless power to the factory and allow export or import to supplement the factory requirements. The power from the solar panels is used by the factory and is not recorded by the utility meter and thus the factory benefits from the supplied power. Excess power is exported via the utility meter and this is then paid for by the utility as is purchases the excess power generated by the solar system.
In a grid tied system the inverters have a number of safety features. In the event of the loss of the utility grid power, as would happen in a load shedding scenario, the inverters no longer have an incoming waveform to mimic and thus disconnect their outputs. This also allows and maintenance personnel working on the feeder cables protection against multiple sources of power. The utility grid as it is still connected would then "expect" the solar generated power to power the whole utility grid, and this would overload the solar powered inverters. The grid tied system is then in an off state when there is no utility grid power being provided.
In order to be independent from the utility grid, especially during periods of load shedding, the factory needs to provide a system that will mimic the utility grid and make the factory totally autonomous. To achieve this the factory disconnects the utility grid from its system so that all the power generated is self-consumed. In order for the grid tied inverters to operate as described above there needs to be a generation source of power to mimic the utility grid. A diesel power generator can then be used, of sufficient power rating, to achieve this. Once the generator is providing power the solar grid tied inverters will then reconnect and all the solar
power will then supplement the generators power to the factory. Any variations in power supplied by the solar as would occur with cloud cover are then taken up from the generator and the system runs autonomously.
580kWp Roof top grid-tied installed in 2014
Lodges and remote schools also benefit from professional solar solutions
Street and Security Lighting
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