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Any application that avoids the usage of batteries would be cost effective; since battereis are really expensive compare to other elements. The invention of grid-connecte ... Voir Plus
solar water heater is the best to secure money in short time, because many reasons one of them is the installation cost which is low comparing with other systems and the ... Voir Plus
On grid systems benefit customer by providing savings in terms of electricity bill. These savings provide for the payback for the initial cost of these systems. Based on ... Voir Plus
Solar Water heater and on grid system also solar pumping if you are in a remote area
solar heater as its r.o.i. is around3-5 years.