Home solar installation

We installed solar. Total cost was 750k, and our electricity bill went from an average of 10,700 a month to 560 a month. (For some reason I don't understand, our system stays connected to the outside grid and uses a little electricity.) So in round numbers, 121,600 a year saved. 6.2-year payback, about 16% IRR. I can earn 5% after tax on a bond, so it looks good to me. Two caveats: 1. Both the panels and the batteries have 15-year warranties, so there may be unknown future costs that would cut into these numbers. (Thanks to Alex Cawthorne for pointing out something was off with the warranty lengths I first wrote — now corrected.) 2. BUT my guess is electricity prices will also rise over time, making the monthly savings bigger. By the way, we bought the best available here. So here's hoping!

DIY doesn't seem that hard. I'm in the middle of installing a system right now. 5kW of panels, 16kWh of battery, a 6.5kW inverter. The whole setup cost less than 140k.

I installed 6kW with 14 panels and a 17kW battery. Be very careful choosing your installer. My installation was a nightmare. Afterwards I noticed the installer hadn't connected the ground properly and had put in substandard panels. For safety reasons I had to replace the panels, the ground wire, all the wiring and the roof mounting at my own cost.

I'm in Danao, Cebu, and had a solar system installed. Best thing I've ever done. Good price, great workmanship, good follow-up, and the constant brownouts that come with living here are a thing of the past

I'm in the early stages of doing the same. Not knowing where you are, I'm not sure the ones I'm looking at would help you