Making 30% return on investment.
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So now that there is time on my hands and I am not making ppts like my life depended on it, I turned my thoughts to optimising costs. My grandmother used to say - one way to make more money is to reduce spending.
So using this principle the house got solar.
Our setup generates 10% more than the average monthly consumption. This ensures that our bill is almost close to 0. We just pay the fixed charge of 150 ish per month. Monthly savings around 7.5k = 90k annually. Cost of the setup after subsidy around 3L. So roi works out to almost 30% . This only improves as electricity rates go up. We got a price hike of 0.6 per unit last week. So roi became marginally better.
3.5 years to recover investment cost and another 15 years or so of free to minimal cost of electricity.
Recurring cost - 500 rs every 4 months for a deep clean with detergent solution. 5 min a week for dust cleaning with high pressure hose.