CnGESI is a system integrator for solar systems. Solar systems would include solar home applications, commercial and industrial power systems, and specific applications such as street lights, surveillance systems, billboards and portable power systems.

CnGESI provides the whole spectrum of service from system design, sizing, cost estimation, provision of solar panels, balance of systems sourcing, installation and maintenance.

How does a Solar Home System work? Solar home systems derive electric power from the sun. The heat from the sun is transformed to electric potential through a series of processes and equipment which will eventually make electricity available for household use, just like your regular grid-sourced electricity.

Photovoltaic (PV) Panels – PV panels are the main converters from heat to electricity. It is made of semiconductors which absorb a portion of the heat and transferred to the semi-conductor cells. The energy knocks electrons loose, allowing them to move freely. These electrons are then led to a unified direction through magnetic fields and harnessed as electricity by placing metal contacts in the PV cells.

Charge Controller – the charge controller is a regulator for battery charging. It ensures that batteries do not over-charge by controlling the flow of current when the system is fully charged. It also regulates the charging of batteries during conditions of heavy usage and when left unattended for long periods of time.

Batteries – batteries are the main storage of electricity. PV panels generate electricity only on sun-peak hours and thus energy has to be stored for use during the night time and cloudy days. Batteries are sized according to potential power use of the household and the capacity of the PV generator.

Inverters – energy generated from the PV panels are direct current (DC) in nature. For household application, most appliances and uses are alternating current (AC) and thus inverters convert the DC power to AC power.

Hybrid Solar Home Systems A hybrid solar home system combines solar system and the usual grid-sourced electricity. Hybrid systems usually use the grid as alternative to storage batteries. In countries where net metering is already main-stream, excess electricity generated during the day or during sun-peak hours is fed to the grid. During night time when the solar system does not produce power, electricity is derived from the grid. Intelligent switch-boxes are essential to direct the system whether to derive power from the solar PV or from the grid. The switch from one source to another should be seamless and unnoticed by the household. Some hybrid systems still use batteries in combination with grid power as a form of a back-up system in cases of power interruption.

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