idontneedfame t1_j6wng74 wrote

well, if you have a "loan on renewables", you won't be paying money towards electricity production so you could use the money you saved to pay off your bank.

Neglectable in this case means that your long-term cost of conventional energy consumption is (very roughly) the same (give or take a few hundred over your lifetime, there are calulators online) as the cost of installing your own pv system.

if you want go to all the way and calculate the total economic value (think energy independency, avoided CO2 emissions, cleaner air, a future for your kids etc) producing your own power will be a lot cheaper.