Regarding Visit a heat pump in Outer Hebrides, I registered mine last month, no interest so far, it appears to the first one.

Home Energy Scotland recommend the Energy Saving Trust - Greener Homes Network (2 properties).

app.visitaheatpump.com/hosts/723

greenhomesnetwork.energysavingtrust.org.uk

I'm also sceptical, some background to this is a surplus of hydrogen on Orkney due to test facilities, they also have some extremely short routes so if it might work anywhere this might be it.

They are also considering hybrid-electric/electric only options.

www.emec.org.uk/facilities/h...

'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

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

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.

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.

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.

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

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).

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.

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.

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.

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).

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.

@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.

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

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.

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.

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.

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.

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.

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.

Storm Watch charging Tesla Powerwall 2 Tesla App view

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.

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.

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.

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.

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.

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.

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 ...

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 ...

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

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.

Mitsubishi Ecodan 8.5 kW R32 and Tesla Powerwall 2

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