Is 1 KWp off-Grid Solar PV systems (1000 Wp Solar PV Modules, 1 KW Mppt built in PCU and 7200 Whr capacity batteries) can save money (based on the Indian - Kerala state electricity tariff) or not? In Kerala the house owners consume less than 3 KWhr/day charges are average Rs 3/- per KWhr
Proposed system sizes 1000 Wp Poly crystalline Modules (25 Years Warranty), 1 KW - MPPT built in Power Conditioning Unit (5 Years warranty) and batteries to store 7200 Whr (5 Years warranty)
Approximate cost is Rs 180,000 and government provide 50% subsidy upfront
According to the present market costing I believe, the user need to spend Rs 128,298/- at the end of every 5 years until the PV panels life time of 25 Years
So the user need to spend Rs 128,298 x 4 = 513,190/-
(the assumptions are after 5 years the battery and PCU can fail any time and need replacement, as per current market rate PCU minimum cost is Rs 30,000/- and Battery 60,000/-)
Please share your expertise opinions in this matter