Re: Typical last mile battery runtime (protecting against power cuts)

[Saku Ytti <saku () ytti fi>]

On Sun, 5 Feb 2023 at 07:50, Chris Adams <cma () cmadams net> wrote:

> Electric heat pumps are great for power efficiency until the temperature
> drops and they switch over to pure electric heat.

Here is graph from popular air heat pump Mitsubishi MSZ/MUZ 25
https://scanoffice.fi/wp-content/uploads/2022/09/rw-vtt-tuntikeskiarvo.jpg
https://scanoffice.fi/wp-content/uploads/2022/09/rw-vttn-testitulos.png

At -30c external, with +20c internal the units produce heat at
approximately 2x of the electric input.

But many other units do not perform that well even at -20c external.
And these units are premium priced. Modern R32 units consistently
outperform old R410A units.

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  ++ytti