That’s seems ridiculous: where are you? Are you sure that’s just solar, or would it also include batteries, maybe a “solar roof”, instead of solar on the roof? As far as I know, most of the systems (in us at least) are designed for shingled roofs: do you have tiles or slate, or something?

Where I live in the northeast us, it’s typically $20-30k for solar panels on my roof, only. I don’t need batteries because I’d stay grid-tied and my roof is pretty new. That’s still ridiculously expensive and beyond any reasonable payback but state incentives make it much more reasonable. They claim 4-7 years payback but since I can’t follow their math, it goes into the bin with the rest of advertising hogwash

DIY solar is apparently a thing. Got exactly this reason.

Really depends on your area and amount of solar.

For the DIY approach with 20 panels here in belgium, it would be about 7000€. A contractor is estimated at around 9000€.

If you make a whole solar farm it would be of course, much more, but for a single family with <8000VA it is more reasonable.

To get a 100k+ quote your area must have horrible anti-solar installment fees or the company is not legit.

That's pretty ridiculous imo. My system in total was around $45k including parts and installation. I got it Feb 2022. It's 17kW system with microinverters for every panel (42 panels). No battery though.

It's actually not that hard. Microinverters have taken a lot of the danger out of it. Every one or two panels has an inverter, they can be individually controlled and tie together with 120 volt AC wiring, so you avoid the issue of 100+ volt DC strings that can't be turned off. And on the physical side, there are now rack systems that install very easily and look good. Designing and installing the system isn't hard. Just look up the documentation from Enphase or someone similar, you just need panels, micro inverters, a combiner panel, and maybe one of their computer management units. There's other manufacturers too but the concept is the same. Installing the solar is the easy part. Getting permits is the hard part. Municipalities throw up a ton of red tape and utilities throw up even more for any sort of grid connected system. So what would be a basic concept that a technician level person could design, ends up being this complicated thing that needs engineering sign-offs and stamped plans that have to be approved by the town and the power company and inspected 18 different ways. This leads a lot of people to do off-grid systems, that is, set up your own solar panels and batteries, and run some portion of your house off at using extension cords rather than hardwired. If you're just putting panels on the ground or on your deck and running extension cords, no need for permits.

Start out with DIYSolarForum.com and see what you figure. It's not rocket surgery.

There are 10 year old electric cars now with failing batteries that no one wants. It’s a now problem, and seeing it makes people not want to buy one (including me)