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The average cost of a grid connected solar rooftop system is approx. Rs 60,000/KWp, upto 10KWp. For more than 10 KWp, it will be lower and if the size goes above 100 KWp it will be as low as rs 48,000/KWp.
One can avail the benefit of 40% accelerated depreciation in the first year of installation itself (earlier it was 80%). This can help to significantly reduce your tax liability.
Solar inverters are designed to block power outflow in the event of grid failure. But if the inverter senses that the power is available (Let’s say from DG Set) then it will start flowing power to load. This means that solar inverter needs to sense that power is available. Some people assume that even if a DG of 1 KVA is installed to send signal to solar plant , it will suffice and solar plant will start giving power. This is theoretically correct but it is not practically possible and practically one needs to connect DG set of 1.25 time load to take benefit of solar power also where in Solar installation should not be more then 80% of DG Capacity. In such a scenario DG will continue to run may be at almost NO load condition so as to consume minimum fuel and power shall be supplied by solar and fluctuations in solar power shall be taken care by DG set.
If above precautions are taken then it is possible to design a system to exploit solar generation and save on fuel costs while DG set is running.
However, recommended settings are - if load is 1KVA then DG capacity should be 1.5KVA and solar capacity which can be installed should not be more than 0.6KVA.
The life of solar panels is about 40 years but the manufacturers give a warranty for 25 years.
Each KW system will generate about 1300 units of electricity in a year. However, it would depend on specific area.
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