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I Bought a House with Solar Panels

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221–230 of 298 posts

Re: I Bought a House with Solar Panels

#221
DIY array with 17 panels should cost $5000 today with inverters and grid tie - thought I would forgo the grid tie and just get a shit fuck ton of lead acids (probably 30 for another $3000) and have energy for at least a day.

Stop paying these racket companies and their dumbass contracts. The DIY is totally easy.

Re: I Bought a House with Solar Panels

#222
post #150
post #34

Earlier quoted context omitted.

That’s because government subsidies always have to be twisted into the shape of a tax cut to avoid triggering low information voters.

Huh? Electric car subsidies were just that, subsidies (i.e. Tesla cars were cheaper).

No they were still structured as tax credits.

https://www.energy.gov/eere/electricvehicles/electric-vehicl...

Re: I Bought a House with Solar Panels

#223

>Supporting renewable energy is important, and I get spending a little more to help the planet. But a for-profit company like Sunrun wasn’t my idea of the right place to do it. That's a pretty strange sentiment. 20 years ago, solar was decidedly more expensive than it is now. A fair price would be higher than grid power. For the installation to have occurred at all, the up front capital cost had to be amortized by a…

Owning your panels with a loan is an excellent investment. Leasing them isn't.

Re: I Bought a House with Solar Panels

#224
post #213

Earlier quoted context omitted.

How do you calculate savings at the 11-year mark? If you'd invested the same amount in index funds over an 11 year period you'd see your money double in an approximately 10 year period.

We have kept records of the power we've consumed, the power we've generated, the cost of the system and the cost of repairs/maintenance (one panel and one inverter so far over its lifetime). For the financial analysis we assumed the money would be committed to paying for power one way or the other, there isn't really an option for putting it aside in the mutual fund so the 'invest' option was off the table. With the…

It's worth modeling the cost of capital of your system to provide a fair comparison. Assuming the it lasts 20 years before you need to replace it entirely and after maintenance you save $2600 a year ($217/month) then what rate of interest could you pay if you took out a loan to cover the initial capital outlay?

Plugging the figures into: https://smartasset.com/personal-loans/personal-loan-calculat... and adjusting the interest rate slider you get a monthly payment of $217 when the interest rate is 11.75%. That's a pretty good rate of return for your investment. Not ridiculous, but solid.

Re: I Bought a House with Solar Panels

#225
post #172

Here's a cautionary tale of purchasing a home with solar panels, even if they're not leased from a third party. We bought a house with solar panels in 2016. The seller had purchased the system less than a year before the house went on the market, and one of the key selling points was that there was no lease to deal with; by purchasing the home, we would 100% own the solar panels and would reap all the benefits of wha…

I am amazed that a company in the business of putting up solar panels on residential homes considers selling the home to be a weird edge case in their business.

Re: I Bought a House with Solar Panels

#226

Earlier quoted context omitted.

True, you’ll still have your 80% but that will be compared to the state of the art at the time as a trade off. The production of contemporary panels should (hopefully) be much much better. Imagine the advances in the next 2 decades: higher efficiency, lighter weight, more module, standards we can’t conceive of. Like the other poster in this thread said: sure your Athlon 500mhz is still runninnfine, even at 80% effici…

I'm a bit disappointed in your response. Did you look up Shockley–Queisser ( https://en.wikipedia.org/wiki/Shockley%E2%80%93Queisser_limi... )? The maximum theoretical single p-n junction efficiency is low 30%s. Sunpower is the best consumer grade product and they are in the low 20%s right now ( https://us.sunpower.com/products/solar-panels/ ). There is not that room for improvement. There are higher efficiency pv ce…

Residential-scale solar tracking doesn't really look that different from electric garage door openers, does it? Those seem to work pretty reliably for years with ~daily cycling.

Re: I Bought a House with Solar Panels

#227
post #198

Earlier quoted context omitted.

I like this argument but I disagree with it. I will stipulate that PG&E qualifies as a 'poorly run, centralized utility' and based on its billing it cannot provide power to residential homes for less money than a locally installed solar system can. The reasons for this are worth considering. PG&E has to maintain a power transmission infrastructure. That infrastructure has a high inspection cost, land use cost, equipm…

Oh, don't get me wrong - solar power generation is fantastic in areas that can support it (Which is most of the world.) Rooftop solar power generation is what I have an issue with. Utility-scale solar has all the advantage that you cited, without the disadvantages of being incredibly labour-intensive, overcomplicating the electric grid, and offloading long-term maintenance to non-experts. If you are going 100% off-th…

It's interesting that you say this because I've had the same feeling. However, I'm still quite hopeful for rooftop installation simply because from a societal point of view it's a better utilisation of land. Where I live we have really ideal conditions for both solar and wind and while I'm relatively happy dotting every hilltop in this area with wind turbines, they've been clear cutting the forest, paving it over and carpeting it with solar panels. I realise that we're going to need some of this, but I would really like to minimise it as much as possible and I'm willing to pay for it. It frustrates me no end that at the same time they started pushing renewable options, they deregulated power sales and capped the distribution costs for the power company in our area. So while the costs of running the grid goes up, they have have no leeway in increasing prices to match. Sigh... I sometimes feel I'm going to be living in a literal silicon valley at some point... The irony, of course, is that I live in Japan and while we have oodles of geothermal potential, it's still a politically sensitive option to even experiment with (for fear of disrupting the hot springs -- lots and lots of money tied up in that and already people complain about the drop off in temperature due to over use...)

Re: I Bought a House with Solar Panels

#228
post #213

Earlier quoted context omitted.

How do you calculate savings at the 11-year mark? If you'd invested the same amount in index funds over an 11 year period you'd see your money double in an approximately 10 year period.

We have kept records of the power we've consumed, the power we've generated, the cost of the system and the cost of repairs/maintenance (one panel and one inverter so far over its lifetime). For the financial analysis we assumed the money would be committed to paying for power one way or the other, there isn't really an option for putting it aside in the mutual fund so the 'invest' option was off the table. With the…

$250/mo is a pretty generous number to compare against. Our >2500 sqft house averages under $100/mo. With the fairly extreme heat we have in in Texas, and A/C set to frigid while we’re home our bill _peaks_ at ~$150 in August. Well..that’s after a $1000 investment in attic insulation the first month we moved in.

Re: I Bought a House with Solar Panels

#229
post #57
post #13

When you get down into the meat of how the tax credits and Sunrun's financing work it's astonishing. Essentially it sounds like Sunrun's investors are paying to install solar panels on your house so they can claim the tax credit to offset their own income. Meanwhile you are paying Sunrun for the electricity generated by the solar panels. There doesn't seem to be much benefit for the homeowner. You're better off buyin…

There's clearly not much benefit, if they sold him on saving a mere $23 per month.

Eh, it's $23 a month with no capital cost to you and environmental feels. You just sign a paper and move on with your life.

Re: I Bought a House with Solar Panels

#230
post #172

Here's a cautionary tale of purchasing a home with solar panels, even if they're not leased from a third party. We bought a house with solar panels in 2016. The seller had purchased the system less than a year before the house went on the market, and one of the key selling points was that there was no lease to deal with; by purchasing the home, we would 100% own the solar panels and would reap all the benefits of wha…

Squirrels and mice are a pain for electrical wire. That's why its important to get them the heck out of your garage. Its never fun to have a car need repairs because the damn things chewed through a cable. Had to replace a friends spark plug wires on his car because he thought the critters were cute.
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