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Re:What a year of solar and batteries saved us in 2025 by systemtest on Tuesday January 13, 2026 @12:02PM (#46603839)
Don't forget that batteries and solar panels go down to zero value. Money would have performed better in a high yielding savings account.

I personally like simplicity, I'd rather have money in an index fund and just pay a monthly bill over having a complicated solar+battery+car charger install at my house that I have to manage through various apps and dashboards.

If it is about impact on the world, invest in a clean energy index fund. Large solar farms and neighbourhood batteries operate at a much higher efficiency than domestic installations.

Re:What a year of solar and batteries saved us in 2025 by n8m8 on Tuesday January 13, 2026 @12:15PM (#46604105)
Is an ETF simple?

I get your point that in modern society, you can invest in an ETF in a few clicks, but in a way, owning your own infrastructure is simpler. Transform the sun into energy reserves with parts you can buy, understand, and install yourself from wholesalers.

A power company is opaque, carries overhead, and requires complexity to serve at an institutional level. ETFs have a similar complexity/abstraction to their customers.

Re:What a year of solar and batteries saved us in 2025 by toomuchtodo on Tuesday January 13, 2026 @12:07PM (#46603946)
https://electrek.co/2026/01/06/catl-ev-batteries-significant...

> For example, CATL is one of four LFP battery suppliers at the Zhangbei National Wind-Solar-Storage Demonstration Project in China. CATL’s batteries are the only ones that have never been replaced, retaining over 90% of residual capacity after 14 years.

Batteries are not only not worthless after almost 15 years in service, they still have sufficient capacity to continue to operate. If you need that capacity back lost to degradation, add a battery ~15 years from now, they will only continue to get cheaper.

Re:What a year of solar and batteries saved us in 2025 by thescriptkiddie on Tuesday January 13, 2026 @12:06PM (#46603923)
battery life span is defined as when the reach 80% of their original capacity. it's possible that the decline will accelerate after that point but they aren't suddenly useless
Re:What a year of solar and batteries saved us in 2025 by IAmBroom on Tuesday January 13, 2026 @03:18PM (#46607275)
Presumably an exponential decay, as for most tool lifetimes.
Re:What a year of solar and batteries saved us in 2025 by hvb2 on Tuesday January 13, 2026 @12:20PM (#46604202)
> Large solar farms and neighbourhood batteries operate at a much higher efficiency than domestic installations.

Maybe, but that power is typically generated far from where it's consumed and so you have significant transmission losses.

Re:What a year of solar and batteries saved us in 2025 by pjc50 on Tuesday January 13, 2026 @12:39PM (#46604558)
Rather like the car, think of panels as buying 20+ years of electricity upfront rather than being exposed to market rates. You can buy a car upfront, on credit, lease it, or rent it; in all of those the longer you commit the cheaper it is.

Not for everyone, but definitely for homeowners with suitable roofs and local utilities.

Re:What a year of solar and batteries saved us in 2025 by SoftTalker on Tuesday January 13, 2026 @12:46PM (#46604707)
I'm with you. I have no interest in owning, running, and maintaining my own personal electrical utility.

I'm happy to pay monthly to let my electrical provider handle all that, and I'll invest my money in something with a better return.