Jamie Matthews
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mtth.org
Jamie Matthews
@mtth.org
Web engineer. Python, Django. Sustainability, clean tech, decarbonisation. Photography, fuzz pedals and dynamic languages. Co-Founder, Technical Director.
Fair, although I’d expect the two figures to line up once that number reaches 13.5kWh.

Trying to follow your approach: last Sunday, according to the Tesla app, my Powerwall discharged 12.9kWh (and charged 0% from solar). Backup reserve is 5% which suggests a capacity of 13.58kWh. Is that plausible?
January 10, 2025 at 9:21 PM
Happy new year!
January 1, 2025 at 11:09 AM
Just about scraped over the 5MWh mark for the year.
December 22, 2024 at 1:58 PM
Hello! Your greener days seem to be off-by-one compared to what’s shown on the Octopus website. Is this deliberate? Are you showing the actual greener slots which might be the early hours of the morning, rather than when to plug in - which would be the night before?
December 2, 2024 at 4:15 PM
Hi Chris! Ours is flowing about 35 degrees. COP of 3 today. Happy with that!
November 21, 2024 at 11:20 PM
Arctic air slowly arriving in the south of England. Seven degree temperature drop between 5am and noon today (purple line). Heat pump now chugging along continuously, pulling about 500 watts from the battery (blue line) and pushing nearly 2000 watts of heat into the house (yellow line).
November 19, 2024 at 1:25 PM
And so the heating season begins. Hopefully my last gas-powered one.
October 15, 2023 at 8:53 AM