this post was submitted on 28 Apr 2025
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If you assume what's being compared is the platonic ideal of both technologies then you're largely correct, but removing them from the context of the real world (where: high density battery chemistries still wear out quickly, biodiesel is common, the supply chain is a major contributor of greenhouse emissions, the need for power backups is infrequent, and where grid power is still in large part supplied by fossil fuels) isn't very useful. Local-grid scale battery storage is the best solution we have for direct energy storage, and it's very much maturing rapidly, but home units are still restricted in the above and countless ~~(because I am too lazy to count them)~~ additional ways. Ignoring those issues doesn't work; implementation doesn't particularly care about theory.
LFP batteries are the right home solution (Sodium Ion soon enough). US is tariff/capacity/policy restricted. Utility monopoly restricted if you want to export to grid, or use your EV as V2G. Utilities are also protected from off grid choices, and are changing their pricing with extortive fixed portions of utility bills. Biodiesel is not a sustainable (worse than ethanol if produced intentionally) solution.
I'm not arguing that utilities don't suck or aren't a big part of the problem, though. There are issues with Lifepo4 chemistry batteries (though I guess many of the recycling issues are being solved) that preclude them being an ideal choice for home battery use (flammability, supply or waste infrastructure, etc.) but they are one of the more promising options. Sodium Ion still has a long way to come in terms of manufacturability, as far as I understand it? But hopefully in the near future they start demonstrating their suitability via implementation.