30ヶ月で3MWh - 家庭用蓄電池の追加統計
Andrej Karpathy氏が自宅に設置したMoixa 4.8kWhソーラーバッテリーが、約1年半の運用で約3MWhの電力を蓄え・供給し、経済的節約効果を生み出していることを報告している。
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家庭用蓄電池の実証データ
Moixa 4.8kWhソーラーバッテリーが約1年半で約3MWhの電力を処理し、太陽光発電システムとの連携による実用的な運用実績を示している。
長期運用による性能確認
2023年8月の設置以来、安定して稼働し続けており、家庭用蓄電池の信頼性と持続性を実証している。
経済的メリットの実感
著者は蓄電池によって電力コストの節約効果を実感しており、具体的な金銭的メリットについて言及している。
個人ユーザーの体験記録
AI研究者の個人宅での実装事例として、技術の実生活への応用と日常的な運用状況を伝えている。
重要な引用
I estimate that it has saved us around 3 MegaWatt hours since it was commissioned.
For the last year and a half it has chugged away slurping up electrons and sending them back as needed.
Its little fan whirrs and the lights on its Ethernet port flicker happily as it does its duty.
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影響分析
この記事はAI業界の著名人による個人体験記であり、業界全体への直接的な影響は限定的だが、再生可能エネルギー技術の実用化と家庭への普及に関する具体的な事例として参考になる。技術の現場適用可能性を示す実証データとしての価値がある。
編集コメント
AI業界リーダーの個人生活での技術応用例として興味深いが、業界全体への影響度は低く、参考情報としての位置付けが適切。実用性の観点からは価値あるデータを提供している。
2023年8月、太陽光パネルと連携させるため、Moixa 4.8kWhソーラーバッテリー（太陽光発電用蓄電池）を設置しました。それから1年半、この蓄電池は黙々と電力を蓄え、必要な時に送り出す作業を続けてきました。動作中は小さなファンが回り、イーサネットポートのライトが嬉しそうに点滅しながら、その役目を果たしています。設置以来、約3メガワット時の節電に貢献したと推定しています。金銭的な面では、…
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Back in August 2023, we installed a Moixa 4.8kWh Solar Battery to pair with our solar panels. For the last year and a half it has chugged away slurping up electrons and sending them back as needed. Its little fan whirrs and the lights on its Ethernet port flicker happily as it does its duty.
I estimate that it has saved us around 3 MegaWatt hours since it was commissioned. In monetary terms, that's roughly £1,000 taken off our electricity bills.
How did I work that out? Well, maths is hard, as Barbie knows, so take all this with a pinch of monosodium glutamate.
Here's a typical month - October 2025:
Yikes! What's going on here?
We use a variable electricity tariff. Prices fluctuate every 30 minutes. At peak times our electricity prices can shoot up to 60p per Kwh. Overnight or when the wind is high, prices can drop to zero. Yes, free electricity! Sometimes the excess in the grid means that prices go negative and we are *paid* to use electricity. Hurrah!
Our battery knows this. Its Internet connection allows it to download the tariff for the day ahead and plan accordingly. If the electricity prices are cheap, the battery fills up. The battery can decide to discharge when we're using more electricity than solar provides, or it can wait until prices are more expensive after the sun has gone down.
Here's an example, again from October:
In October, about a third of the power stored in the battery came from the sun. About 92% was used by our house with the remainder being sold back to the grid if it was profitable to do so.
By contrast, here's June 2025 - a sunny month in the Northern Hemisphere:
Here, only 12% of the battery charging was done by the grid. 88% was done for free by solar power. But because solar was so plentiful, about 15% of the battery was sold back to the grid.
Maths. Is. HARD!
I've been playing around with various charts, graphs, spreadsheets, modellers, and a bit of calculus. I basically came to the conclusion that the easiest way was to assume I was saving the energy price capped value of a kWh.
That varies from 25p to 35p. If I fudge the numbers just right, it rounds off at an even grand.
It's Payback Time
No-one ever asks what the payback period is of buying a car vs taking public transport. You never see anyone amortising an engagement ring over the length of a marriage. Still, here we are.
We paid £2,700 for the supply, install, and commissioning of our battery.
That means the payback time for the battery will be between 6 and 7 years. If energy prices go up, the payback time goes down. Its capacity is showing no degradation yet and I hope it will provide us with many years of savings before it needs to be repaired or upgraded.
Solar batteries are getting cheaper and their capacity is getting bigger - although not big enough to store all my home's electricity.
If you can afford the upfront costs, it's like pre-paying for a chunk of your energy usage and can help protect you against sudden price rises.
You can sign up to Octopus and get a £50 bill credit if you want to switch to a variable tariff.
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