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seumasm.bsky.social @seumasm.bsky.social · 10/02/2025

Renault #HydrogenSoufflé commercial vehicle edition. Incredibly predictable, at least some realism seems to be being expressed at CEO level from a major auto manufacturer now, shame the funds weren't invested in their EV platforms. www.hydrogeninsight.com/transport/th... @mliebreich.bsky.social

hydrogeninsight.com

'There is currently no market for hydrogen vehicles', admits Renault CEO after joint-venture collapse

The French auto firm’s Hyvia joint venture with Plug Power has been in receivership since December

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seumasm.bsky.social @seumasm.bsky.social · 09/02/2025

Thanks, I have Home Assistant setup in the house already, you can control the Zappi from HA? You recommend Solar Edge? Considering it with Powerwall 3, I'll be limited to G98/3.68kW, looking at 10 panels roof mount (~4.2kWp). Impressed with the Powerwall 2 and 9*430W JA solar panel & Solis 3.6kW.

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seumasm.bsky.social @seumasm.bsky.social · 09/02/2025

Was considering getting a Zappi in a house with a Powerwall 2 and solar (Solis inverter), do you recommend it? Was wondering if/how they integrate? Use an Ohme ePod on another property with no solar or battery currently, like the lack of mobile network reliance with the Zappi and solar support.

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seumasm.bsky.social @seumasm.bsky.social · 09/02/2025

Pretty good for a base rate, the advantages (lack of dependence on gas) and disadvantages (relative lack of flexibility) of French nuclear. Only a few days my average rate has been below that this Winter. Suspect the French fleet will be doing a lot of export this year with the elevated gas prices.

seumasm.bsky.social @seumasm.bsky.social · 08/02/2025

Yes, above is for my mother's house, also switched my own house over to Go from Cosy for the EV. I also hope to get solar/battery in there this spring. I suspect high gas prices will persist making Agile/Tracker less attractive. ~10kWh solar + overnight battery charge provides enough for heatpump

seumasm.bsky.social @seumasm.bsky.social · 08/02/2025

Shifted tariff to Octopus Go (8.5p/kWh 0000-0530, 26.87p/kWh otherwise). Heatpump running mostly on cheap rate&solar, reduced total grid demand ~21kWh, daily costs ~£5. ~4p/kWh heat, cheap running costs. Combination of PV/battery/tariff/heatpump is impressive. Average ~3.63kWh solar/day (22 days).

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seumasm.bsky.social @seumasm.bsky.social · 08/02/2025

It is possible to install the Powerwall 2 under a G98, that is the case here. It seems more suitable to DNO restrictions than say the GivEnergy AIO. The Powerwall 3 is DC coupled. I don't like the politics myself but I still believe in the company although this install wasn't my decision.

seumasm.bsky.social @seumasm.bsky.social · 06/02/2025

Looks like they sell for ~£32k with 140k miles on them from Autotrader with warranty. Spoke with one of drivers up in Edinburgh at a rapid he had it for 4 years done a lot of mileage and some long distance, very happy with it. Think they were £60k new and he used Scot Gov assistance to purchase.

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seumasm.bsky.social @seumasm.bsky.social · 04/02/2025

Moving it to Self-Powered in the afternoon after DHW cycle then it doesn't need to be on Time-Based Control till cheaper 2200 slot. It is only aware of the heat pump load and the electric shower, these are irregular in demand. It is aggressive about charging to 100% unlike their EV 80% approach.

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seumasm.bsky.social @seumasm.bsky.social · 04/02/2025

I'm impressed with the Tesla Powerwall's algorithm. It is a little frustrating to have such little automated control of it in the Tesla App but using the Netzero app (www.netzero.energy) you can tell it to switch between Self-Powered and Time-Based Control (uses time of use tariff data given to it).

netzero.energy

Netzero

seumasm.bsky.social @seumasm.bsky.social · 04/02/2025

I think people will be very surprised how quickly (on a decadal scale) this will take place, even EVs are very inefficient (in a financial sense) depreciating assets.

seumasm.bsky.social @seumasm.bsky.social · 04/02/2025

@duncanlamont2.bsky.social I think you have an impersonator duncan-lamont .bsky.social (without the space), he follows your followers and reaches out in DMs (presumably to scam) reported account.

seumasm.bsky.social @seumasm.bsky.social · 03/02/2025

I drive a Renault Zoe ZE50 if I was to choose again now second hand I would probably go Kia e-Niro/Hyundai Kona 64 kWh with heat pump, MG5 or older Tesla Model 3. The older Ioniq 38 kWh with shorter range and BMW i3 is also a good choice. ev-database.org is a good resource.

ev-database.org

EV Database

A complete overview of all electric vehicles in Europe. Search and compare by range, make, model and price.

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seumasm.bsky.social @seumasm.bsky.social · 28/01/2025

Ecodan 6kW R290, 1970s semi 2 bedroom, loft insulation, unfilled cavity, new radiators, Octopus Cosy tariff. Replaced sparingly used resistive/storage heaters was reliant on solid fuel stove last winter. Overall average electricity use similar to last winter, no coal now, improved thermal comfort.

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seumasm.bsky.social @seumasm.bsky.social · 26/01/2025

Solar production over 9 and a bit days is 26.15 kWh, averaging > than 2.6 kWh for 3.87 kWp system in mid to late January at 58.47N, production more than covers heat pump demand in Octopus Cosy peak period (via Powerwall) & approximately almost 10% of overall household demand during the same period.

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seumasm.bsky.social @seumasm.bsky.social · 23/01/2025

Haven't got it in the North West of Scotland, ~140 miles NW of the Red area. Forecasting gust of 90 mph+ but less impact here I guess. Never had a red warning up here? Or at least since these alerts have been active.

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seumasm.bsky.social @seumasm.bsky.social · 23/01/2025

Help to have new panels I guess, they are bifacial if that adds much, I'm pleasantly surprised they produce in dull conditions. Will be frustrated by clipping from the inverter by Spring I expect, should have tried for more panels for current period. Hopefully they'll stay in place with the wind.

seumasm.bsky.social @seumasm.bsky.social · 23/01/2025

Interesting, I misspelt/got my units mixed up. I meant kWp which will be the 2.87 figure (7 panels?). That seems like pretty decent production, the PV-GIS calculation I did was only for ~50+kWh January, ~30+kWh December for the system I mentioned above.

seumasm.bsky.social @seumasm.bsky.social · 23/01/2025

Neat feature of the Tesla Powerwall 2 is Storm Watch grid charging, even without the DNO approval in place it grid charges (not normally possible) when Storm Watch is active. Period is 0600-2359 tomorrow. DGAF about peak rate, £2 for ~5 hours potential off grid heating feels worth it.

Storm Watch charging Tesla Powerwall 2 Tesla App view

seumasm.bsky.social @seumasm.bsky.social · 23/01/2025

What is the DC kWhp rating of your panels? I've been impressed by average 2.4 kWh/day on a 3.87 kWhp system for mid-late Jan over 6 days, ~150 miles North of you. Early days, 9 x JA Solar 430 W panels and a 3.6 kW Solis inverter. Angled to South-SouthWest no obstructions, relatively flat terrain.

seumasm.bsky.social @seumasm.bsky.social · 23/01/2025

Yes, the ECO actually seemed less efficient but I don't really trust the reported COPs on Ecodans much. My mother's system is trending to 2.1 (Heating & DHW). 2.6 - Heating 1.6 - DHW My own R290 6kW unit is 3.2 combined. 3.3 - Heating 2.7 - DHW Consumption reported on the R290 is 30%+ measured.

seumasm.bsky.social @seumasm.bsky.social · 23/01/2025

Yes, I have an R290 (FTC7) Ecodan 6kW myself and it underpredicts 30%+ on average on energy used vs a Shelly clamp, I presume the production numbers are similarly inaccurate. The estimated usage on the 8.5 kW R32 Ecodan FTC6 seems far closer. I think lack of pump measurement is a large factor.

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seumasm.bsky.social @seumasm.bsky.social · 22/01/2025

I had similar reservations, it was designed for 45 degree flow, the radiators are decently sized. We paid for 4 extra. Two are mostly switched off. Arguably we haven't had an extended design temperature test, the coastal location keeps temperatures significantly milder than elsewhere.

seumasm.bsky.social @seumasm.bsky.social · 22/01/2025

The thermostat is generally set to 19 C on AutoAdapt it rarely falls below that, I placed the thermostat in the bedroom to give better elder occupant comfort than in hallway, I increment temp sometimes to spur it into action. Using I would say in the high teens of kWh daily on average since install.

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seumasm.bsky.social @seumasm.bsky.social · 22/01/2025

insulation (to be completed) it is delivered through a government scheme in Scotland aimed at over 75 year old occupants with no existing 'central heating' this replaced storage heaters, which had also been installed via a government scheme in mid 2000s. The installer considered the 11.2 kW unit ...

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seumasm.bsky.social @seumasm.bsky.social · 22/01/2025

It is my mother's house, they built it mid 1980s, what was called a 'kit' house, timber frame block exterior. Relatively poorly insulated, as it had a peat burning Rayburn range stove. Four bedrooms, ~140 sqm. This was to be delivered as part of a larger package of works, including underfloor ...

seumasm.bsky.social @seumasm.bsky.social · 22/01/2025

Peaked at 376 gCO2/kWh, think that might be a recent record? Highest average as well in the short period I've been monitoring it. I wonder if the dip was gas generation going offline during low demand? Also not often I expect you see solar outperforming wind at this time of year.

North Scotland Carbon Intensity plot from Home Assistant, showing peak of 376 gCO2/kWh and values since 2025-01-21 00:00

seumasm.bsky.social @seumasm.bsky.social · 20/01/2025

Heat pump installed 40 days ago, running well during briefly sub zero weather. Powerwall 2 installed last week along with solar (~3.6 kWhp). Solar generation covering all Cosy peak tariff (4pm-7pm) heat pump use in January (@58.47° North) since operational, admittedly mostly mild temperatures so far

Mitsubishi Ecodan 8.5 kW R32 and Tesla Powerwall 2

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seumasm.bsky.social @seumasm.bsky.social · 20/01/2025

A lot of that carbon intensity is for supplying South Scotland and marginally 'North West England' and 'North Wales and Merseyside' (via subsea link through South Scotland). Doesn't change the fundamentals though, my mother got a Powerwall fitted last week so no heat pump load during peak period.

seumasm.bsky.social @seumasm.bsky.social · 20/01/2025

You were looking at the Scots wikipedia page for the car. sco.wikipedia.org/wiki/Daihats...

sco.wikipedia.org

Daihatsu Materia - Wikipedia

seumasm.bsky.social @seumasm.bsky.social · 16/01/2025

Recommend Octopus Compare app on Android and iOS, small monthly charge of ~50p if you want beyond the last month comparison. If you are tariff swapping you need to track the change of tariff dates elsewhere, there is also a Beta function for Consumption Shift. Upcoming rates also included.

Octopus Compare last month tab comparison of Agile vs Cost tariff.

seumasm.bsky.social @seumasm.bsky.social · 16/01/2025

My experience with a 6kW R290 is that the Ecodan over predicts power usage on average by 37% vs a Shelly 1M with a high degree of variability. The tariff trials seems to be capped to a small number of users and a total number of kWh per user. It seems like a good idea but uses unreliable data.

seumasm.bsky.social @seumasm.bsky.social · 14/01/2025

Propane is the refrigerant used, it is not consumed it may eventually leak and need to be topped up but it is not the fuel or burnt, my small domestic unit has 0.6 kg propane (6 kW/20k BTU). It has orders of magnitude less GWP than the other commonly used refrigerants (R32, R410a, R134a).

seumasm.bsky.social @seumasm.bsky.social · 07/01/2025

Mitsubishi Ecodan's have Coastal Protection models (indicated by model codes ending in BS) widely used in the 'coastal' islands of Scotland without issue over 10+ years they are manufactured in central Scotland. It historically was an issue. library.mitsubishielectric.co.uk/pdf/book/Eco...

library.mitsubishielectric.co.uk

Ecodan Coastal Protection Models (BS) Product Information Sheet - Document Library - Mitsubishi Electric

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seumasm.bsky.social @seumasm.bsky.social · 06/01/2025

Largest period of 0 intensity recently was 14th-26th Dec - 12 days 3.5 hours, with other multi days periods since Oct The Carbon intensity calculation methodology won't be perfect and there maybe some bugs in how it is picked up in the integration but it is an interesting data to play around with.

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seumasm.bsky.social @seumasm.bsky.social · 06/01/2025

Plot and csv data linked below. gist.github.com/seumasmorris... October 1st to today gist.github.com/seumasmorris... Home Assistant - Integration github.com/BottlecapDav...

Plot of Carbon Intensity North Scotland December 2024 10th-13th

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seumasm.bsky.social @seumasm.bsky.social · 06/01/2025

I found it interesting roughly matching the data for North Scotland in the Octopus Energy integration in Home Assistant with my heat pump demand averaged 15 gCO2e/kWh previously. The last changed value of 0 sometimes sticks around for 10 days or so!