Applications

Solar Applications 

 

Solar Electric Power can be generated varying from 100 Watts small solar home systems to 100 MW Solar Power Plants or sometimes more than that. The solar power systems are of two types; one is off-grid and other is on-grid systems. In off-grid systems, the system has no link with Utility grid and components used in Systems are Solar Panels, Charge Controllers, Inverters, Deep Cycle Batteries, mounting and electric accessories. Solar Panels convert solar radiations into electric current and this current passes through charge controllers which charges the battery by controlling current for the battery. Charge controllers maintain control on charging the battery for its long life. So the DC power is stored in Batteries and this stored energy is converted into AC Power to operate the AC appliances. The DC appliances can be operated directly with the battery. So DC and AC load can be operated through a solar power system.

Un-professional and Un-trained people in the market are selling under-designed and low quality systems because of which the customers are losing confidence in solar technology. On the one hand, solar technology has high upfront costs and on the other hand people are selling low quality and under-designed systems to cut down the costs. The most important thing in solar Power systems is its right design and putting high quality system components which should guarantee faultless operation of the whole systems for 20 years. The other important thing for customers is that they should not buy system in watts but systems in watt-hours. For example 500W system can work for one hour and can work for 24 hours. If it generates power for one hour, the system capacity will be 500 Watt-Hours and if the system works for 24 hours, 12000 Watt-Hours (12 KWHR per day means 12 units per day). Now both systems are of 500 W but their operational hours vary. The cost of the system is calculated as per watt-hours, not as per watt. So customers should not buy watts but watt-hours as they are buying not watts but watt-hours which is real energy as they pay their electric bills in watt-hours or Kilo Watt Hours which is called the Units in common language.

On-grid systems are common in the world and world is moving toward on-grid technology. On-Grid system is that system which is connected with Utility Grid with built in two meters one is export meter and one is import meter and in some case one bi-directional meter which reverses when electricity is sold to Grid and at the end the user pays for the net meter reading. In two meters system, when energy is sold to Grid, the export meter counts and when energy is bought from grid, import meter counts the power consumption and user has to pay the net reading of both meters. User/Power producer will be paid by the Utility if Utility has bought more and sold less. To make legal such systems, there is FIT (Feed-In-Tariff) policy by which the solar power generation is governed. Through FIT policy, the Government fixes up the rate of buying from solar power producers as per slabs. In Pakistan, there is no net-metering policy and there is no FIT policy. On-Grid power is cheaper and does not have batteries. One of the barriers in FIT in Pakistan is the continuous load shedding because such systems stop working as such systems have no back up when grid is off.

some_text

some_text

some_text

some_text

some_text

Back to Top