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Who's your electricity provider and what's your tariff?

Mars · 2021-03-02T22:09:42Z

Electricity tariffs are a key component of running costs when it comes to heat pumps. Please share who your electricity provider is and what tariff you're on.

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Electricity, Tariffs, Monitoring, Electrics & Providers

Last Post by Majordennisbloodnok 11 minutes ago

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Papahuhu

(@papahuhu)

Reputable Member Member

Joined: 1 year ago

Posts: 383

13/08/2026 4:06 pm

@toodles weird. It’s only started doing this very recently?

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Toodles

(@toodles)

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Posts: 2914

13/08/2026 4:07 pm

As in this example, it never did reach full charge ready for an export to exploit the Flux regime to the max!

Regards, Toodles.

Toodles, heats his home with cold draughts and cooks food with magnets.

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Toodles

(@toodles)

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Joined: 4 years ago

Posts: 2914

13/08/2026 4:11 pm

@papahuhu A month or two back. This is the message revealed upon tapping on the text.

Toodles.

This post was modified 54 minutes ago by Toodles

Toodles, heats his home with cold draughts and cooks food with magnets.

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Papahuhu

(@papahuhu)

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Posts: 383

13/08/2026 4:23 pm

@toodles must be a PW2 thing, I understand the 2 versions use different battery chemistry.
Im semi intentionally abusing my battery, it gets 3 full cycles as part of using cosy in the winter so I figure I may as well go for broke and work it hard in the summer too for a warranty claim. I estimate it will drop below 80% after 8 years.

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Toodles

(@toodles)

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13/08/2026 4:29 pm

@papahuhu 😱 Toodles.

Toodles, heats his home with cold draughts and cooks food with magnets.

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Old_Scientist

(@old_scientist)

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Posts: 519

13/08/2026 4:48 pm

I saw mention of that optimised charging in an update release a few months back, but I've also never seen it in action on my PW3 - it always fully charges to 100% same as it's always done.

What @papahuhu says makes sense - it could be a PW2 thing to help extend the life of the battery, but they do not feel it necessary on PW3. Maybe Elon was getting too many warranty claims on PW2?

My battery gets one full cycle (0% -> 100% -> 0%) every day in summer on Flux. When on Cosy, it's more variable. Warmer days probably don't even see one full cycle (13.5kWh throughput), whereas the very coldest days may see 2.5 cycles (~34kWh). Over the course of a full year I doubt I'm much over one cycle per day - maybe 400 cycles max. At that rate I'm well under the 6,000 cycles other manufacturers suggest, and I feel I'm working my battery reasonably hard.

Before I switched onto Flux at the end of June, my battery was only getting down to 70-75% before solar was charging it back up again, so essentially it was permanently sat between 75-100%, exactly what Tesla suggest isn't ideal from their optimised charging update! So I'm not concerned at fully cycling the battery each day on Flux - it's what it was designed to do, and it's what I bought it for - the less I use it, the longer the payback period.

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.

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Majordennisbloodnok

(@majordennisbloodnok)

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13/08/2026 4:58 pm

Posted by: @papahuhu

↑

...

As an aside, I remember you mentioning you chew through about 20kWh a day, you do realise that is very high for a 2 person household.

...

Can't say I disagree, @toodles. Given most households use around half that there's definitely a good case for a bit of investigating. Given you include DHW and my figures exclude that, I can understand if you're in the 10-15 kWh bracket but to get to around 20 kWh it feels like you're supporting the whole of the WI with cake-baking.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"

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