depreciation for solar power system

As Per Income Tax 15% Depreciation Applicable 

Depreciation rate is 40% for all renewable energy systems.

Depreciation of 80 % was allowed on plant and machinery of the solar power plant. 80 % of Rs 500 lacs is Rs 400 lacs. This value can be expensed in the very first year itself, which entails the name Accelerated Depreciation, since a large value of assets is shown to have depreciated in the very beginning. solar rooftop system dealers in Nagpur will help to solve this problem.

Could someone please tell me the rate of depreciation on an automatic voltage controller?