Solar Energy energia solar en latinoamerica energia solar fotovoltaica energía solar fotovoltaica en latinoamérica energias renovables energias renovables en latinoamerica latin america latinoamérica renewable energies renewable energies in latin america solar energy solar energy in latin america solar photovoltaic energy solar photovoltaic energy in latin americaĬells are silicon in the most used modules, element which is the main component of the silica, the material of the sand.
PLACA SOLAR DE SILICIO MANUAL
This is an extract of contents included in Technical-Commercial Photovoltaic Solar Energy Manual and Sopelia e-learning training.Īll you need is Sun. The manufacturer who can optimize them will have found the solar sector Holy Grail. What is the disadvantage? Its very high price. Lithium: they take up little space, they weigh less, they do not emit gases, they can be put anywhere, loading time is the fastest, total discharges can be made without affecting their useful life in a relevant way. Therefore, if it is necessary to control charge state, they aren´t the best option.ģ. They can´t be tested with same reliability as lead acid. They are recommended for isolated or dangerous access places.
The electrolyte they use is an alkaline, have a low self-discharge coefficient, good performance at extreme temperatures and the discharge they support is around 90% of their rated capacity. Nickel-cadmium: offer better performance, but have a higher price.
These batteries don´t require maintenance in water aggregate form nor develop gases, but both require less deep discharges during their service life.Ģ. There are also 2 types of sealed lead-acid batteries: Gelled (incorporating an electrolyte gel type) and Absorbed Electrolyte (electrolyte is absorbed into a microporous glass fiber or a polymer fiber web). Lead-antimony are the most used in medium and large systems and lead-calcium are mainly used in small systems. Lead-Acid: Characterized by their low cost and maintenance they require (need to be in a cool place and periodically check electrolyte amount). If discharge depths are respected and maintenance is correct, battery service life should be approximately 10 years.ġ. Way to prevent this is by introducing a charge controller.Įvery time battery is recharged, does not completely regenerate, resulting in a degradation that will determine battery life. It is the time from complete charge to discharge.īattery life is measured in number of cycles it can handle.Īuto-discharge should also be considered as an additional consumption that daily demands a certain percentage of stored energy.Īs damaging as excessive discharge is for a battery to too much load. In renewable energy systems, only deep discharge batteries are used (we refer to capacity percentage that is used in a cycle of loading and unloading).ĭeep discharge batteries have an average discharge of 25%, and can reach 90%. The loading and unloading ratio and the battery and environment temperature are factors that can make vary its capacity.
PLACA SOLAR DE SILICIO FULL
It is the maximum amount of electrical energy that can be supplied from its full charge to its complete discharge. In a battery, we have to take into account 3 technical considerations: The choice is a compromise between economy and suitability starting from a minimum quality that provides reliability and long life to the system. Therefore a safety margin is required which will mean a small loss (about 10%) with respect to maximum power that module could provide at higher voltages. The battery determines modules operating voltage. In addition, sometimes battery provides an instantaneous power higher than that of modules (eg: for starting motors) and provides stable and constant voltage regardless of light incidence. The battery is an electrochemical device that transforms chemical energy into electrical energy, whose presence is necessary because solar modules only generate energy when light hits them. Without batteries, off-grid PV systems (except some cases such as water pumping) would be meaningless, because their functionality depends on electrical energy storage.
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