ATS price

I have two separate wapda connections installed at home. I am planning to install an ats to switchover between them. My usage is that of a typical home with maximum consumption not being more than 15KW (one 1.5 ton AC, motor, fridge, freezer, few fans and lights). Can you please tell me what would be the price range for an ATS for my setup?

Off topic, what is the advantage of switching?

convienience of not having to wake up at 2am to manually switch from one connection to the other one.

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use this type of relay

price 400 to 600 rs

load 200A

http://www.upsats.com/prd.aspx?cat_name=ATS

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ATS-50 Automatic Start Stop Generator Engine Controller Board for Single and three Phase Generators.\

price 950