joth

I predict at some point someone will suggest http://sbstradesales.co.uk

Fairly sure it's not that simple as they also verify the access line ID that the session is coming in on, so you can only use your DSL account on your own phone line, as that's the primary key used for routing from Openreach to the ISP, and for billing. (The PPPoE is just a small level of additional protection to your neighbours from being able to wire tap your line and use that for internet access, as was the case before they added that authentication) .

Car insurance is terrible for this. Three years in a row I've had to switch to avoid it going up massively, instead managing to make it go down. Then we had to move last month to start the renovation, only a mile away and still very much in the same town with same off-street parking, they wanted to add £140 to the premium. Given we'll be moving back in 6 months what are the odds it magically goes up again, rather than down as you would imagine. One thing that really drives lock in with home broadband is they all want to ship out a new WiFi router (that's often part of the sales pitch, like mobile phone contracts) but everyone know what a pain in the butt changing router is so won't do it more than once. Using your own router is so much better idea but they've moved to PPPoE authentication which is a pain to reconfigure in itself, plus some ISPs like Sky try and stop you from even discovering your own line authentication password. (Plusnet is easy, as it's the same as the password you use to log into their website. )

This is Warmflow known for oil boilers? I have no experience but generally the views of their customer service (both here and elsewhere) seem to leave a bit to be desired. https://g.co/kgs/DPXkFi

I guess this was put in by a big 6 supplier? The small suppliers don't have much (if anything) in the way of national infrastructure to support meter installs, so most rely on https://www.sms-plc.com/ for installing meters (it seems SMS generally own the meter and the supplier rents it from them) so are at the mercy of whatever SMS choice to supply (or fail to supply) in a given area. AFAICT, SMS don't do any 3ph smart meters yet yet. The rarity of them (and inability to supply them) means it's probably in Octopus's own self interest to deny supplying their service on an untested meter even if you've managed to snag one from another supplier.

Also bare in mind that even with a very accurate record of historic usage, while better than nothing, is going to be less and less perfect for gaining a genuine illustration of future savings potential unless you can also augment it on a half hourly basis with what % of your demand was unavoidable/unmovable, and what portion you could easily (and ideally, automatedly) have time shifted to another point in the day had a different tarif offered incentive for you to do so. This is certainly a second order effect, but it's a bit of a schrodinger's cat problem. All forms of dynamic pricing since E7 are intended to alter behaviour (of people or systems), but without actually running it for a while it's extremely hard to predict how much demand shift will actually occur. The comparison sites don't have a chance at getting this right. It leads me to think the big battery in every house will not come about because it's strictly economically justified, more because it gives a glimmer of hope of returning the masses to a predictable pricing model. It wouldn't be crazy if the price comparison sites strike deals to offer discounts on batteris, simple so they can get back to building in some kind of guarantee about overall cost/usage ratio.

Good grief, that's 100A on a single appliance. What sort of grid connection do you have? Nit: 48 kWh

Surprisingly, better insulation can put the effective price up: if it improves your EPC it will reduce the RHI payments. (At least, that's how it rolls in England)

I know what you mean. Early on in the project, an executive order was issued for windows to have all matching sightlines. (In fact, that was a standing order from the previous house when my SO arranged the new window order) The other drivers for openables in our project: - build regs requirements around escape routes - window manufacturer's automated blinds can only be installed in opening units (Internorm) - kitchen window seems nice to be openable in case of too much burnt toast. All that counted for, I think we've only managed two non-openers.

Have you already ordered windows? If not remember to get them without trickle vents. And generally the better the airtightness of the house the better the MVHR will work. We have good airtightness (better than 1 ACH) on our spec so it's a contractual requirement for our renovation contractor

I got some of these to quieten down my ubiquiti switch & router https://www.amazon.co.uk/dp/B071J8CZP9/ Be sure to get the deepest ones that fit (e.g. 40x20mm not x10mm for the above size) as they'll move more air per rev hence can be run slower The switch likely won't have speed control either but you can get little PWM controllers to put in line with them to set at a low speed. Iirc PoE switches can run a fair bit warmer so check again after everything is hooked up.

We're putting service voids on all external walls, and I was going to drop ducts with pull cords through it at regular intervals to make it easier to pull something new through in future. A colleague said he just dropped spare lengths of cheap cat5 instead. That way there's a reasonable chance he could just use that as is, and if not use it as a pull cord to pull whatever cable he actually wanted there instead. I expect I can get to 50 with those alone :-)

That is fantastic, given me a better idea in a quick scroll that I've managed to gather from numerous times through the Octopus website. Basically, at this time of year anyway, you could get a fairly long way with with Agile by just having a bunch of timer pastiches to turn off the heaviest loads between 4 - 8pm. Definitely going to have to do some more modeling on this, but it does give me a pang of regret we didn't install 3 phase after all, as it would open more options for rapid charging a car and a wall-mounted battery at the very cheapest rate. It's fairly moot as don't have either those things to charge yet! But I see them both as inevitable at some point.

Colling is must for us. Wondering if cooling could be enabled somehow on non-cooling version. Right. I'm very reluctant to put down £2k+ on something that doesn't have it and then regret it. I'm getting more and more suspecious of that table (or, my interpretation of it). I found this shop selling the EBLQ (reversable) model online in France. At first I thought "yay short hop to go get it" but then I noticed in their COP table they list A7/W35 as 4.52 for the 7kW model. Which matches the "COP" row at the very top of this page: https://www.daikin.ch/fr_ch/products/EBLQ-CV3.table.htm 4.52 (1), 3.42 (2) The big table at the bottom of that page is listed as "COPd" values, not COP. Along with a bunch of other value (Cdh, Pdh, losses) I'm not sure how to interpret either. So yes, false alert I think,

ESPHome is C++ (wrapped in YAML), but it looks pretty clean really, { and } aside, I can now even cope with these new fangled C++11 keywords. Ah sorry by "driver" I meant SW driver, a few lines of code to read off the UART. (So far I've done everything through YAML config only). But yes, good point the ESP8266 is only rater to take 3.3V on the GPIOs (datasheet, page 17) , but it looks like over voltage protection only kicks in a about 6V so people generally get away with 5V input. I also see the Telaire 6004 has a 0-4V analog output, so that would be another very easy way to grab continuous readings.

Oh yes, if you do manage to find it I could be very interested to buy it. I'll need to research drivers for it, but I'm don't mind getting my hands dirty with that (I feel myself being gradually drawn into this world of ESP8266) My plan B would be to buy a ZyAura as the built in display on that maybe convenient and it has an ESPHome driver already. If I'm careful with the soldering I maybe even able to squeeze the D1 mini into the case with it Hint taken! Well, I think this has dropped down to my"plan C" now, but having a reference device for this in the buildhub library could be useful I agree. If I do end up on this path I'll certainly be open to making it available on loan.

So it seems the calibration loops are purely about finding the zero-offset? So may explain a +/-400 error or so? They can't possibly explain my error though, I'm assuming 3600ppm in this relatively draughty house can't possibly be possible. I'm debating whether to buy a second MH-Z19 to run next to the first and see if they're consistently overreading by soe much, or buy (or rent?) an expensive handheld air quality meter as a reference, or get one of these other less inferior sensors to continue the DIY with (but I2C bus and hand-crafted driver sounds like more investment in time) or just give up

Hmmmmmmmm not sure this will be worth all the bother really. I ran the calibration cycle with all windows open yesterday morning, and overnight the numbers were even more whacky post-calibration, over 3600ppm. Again I'll let this run for a few more days and see if it settles. Also it might well be a duff unit / QC reject I suppose. Eitherway I think I've had a fun mini-project proving @Ed Davies's point.

Yeah note that model is 3-phase too! Single phase only takes you to 7kW in their range, very surprised by that (having just committed to sticking with single phase). Daikin have units are very readily available and claim an much better A7/W35 COP of 5.75 comparing like for like 7kW models, so the R290 super coolant achieving 4.8 is bit of a let down in that regard If I believe that claim, then on PHPP (even allowing for Sunamp being twice as good on heat losses) it means we're much better off with UVC + Daikin than Sunamp+Vaillant R290, both in terms of capital and running costs. The only linger temptations for Sunamp then is less summer overheating and smaller size, and the Vaillant R290 maybe marginally quieter running, but I don't think either those points justify the massive increase in costs and risks (not to mention, installers of either Vaillant ASHP or Sunamp are like hens teeth in our area, getting someone with experience of both is impossible). The one fly in the ointment for me is Daikin seem to have discontinued the monobloc model with cooling (EBLQ07CAV3), whereas the non-cooling version is readily available everywhere :-( If I can source the EBLQ on the continent I literally might drive over there to get it. Need to check how big the box for it is! PS thanks for pursuing and sharing all this info @Dan Feist. My efforts achieved 100% less data, not for want of trying!

I was looking at Panasonic units e.g here Very common in southern Europe, cost about 4 times more from UK suppliers it seems or 30 times more to get installed as part of an install quote from a (higher end) UK builder. (That included ducting to rooms so not a fair comparison, but still) Fwiw we decided to go with ASHP for UFH but just put all the plumbing in for option of retrofitting fan coil in future if needed. We're not intending to have any heating in upstairs rooms, but the fan coil is backup for both heating and cooling. (Adding air ducting is relatively easy as I have loft access above each bedroom). Fwiw a totally different tack would be a couple "plinth heaters" under kitchen units, especially if in an open plan area. These are also fan assisted radiators/coils so might work very well for cooling too, and are relatively common and affordable in UK (caveat that cooling works better if the grill is dropping cool air from above, but still it'd be better than nothing)

Wunda seems to be the most frequent choice here https://forum.buildhub.org.uk/search/?&q=Wunda

It's more common to use air-to-water, and then route the (cold) water through a fan-coil unit or fan-assisted radiator to effect the same. Some folks here also put the cold water through UFH circuit to achieve some degree of cooling, but - going on how many snags and bumps people seem to get with UFH controllers at the best of times - I'd think only an enthusiast would go down this route.

Welcome! from a fellow Herts-based self builder (well, customer renovator). I can't help with your question, but when you do have an answer I expect @puntloos will be interested. ?

Wireless bandwidth is already a finite resource. The demands on wireless bandwidth are already growing much faster than the available allocations are so using that finite bandwidth so everything is focused on getting the best efficiency out of this finite resource. Re-transmitting every packet for each 'hop' of a mesh uses up that bandwidth approximately N factors faster for an N hop route. On top of that, efficient network route discovery protocols perform very poorly (i.e. re-transmit more often; see previous point for why that's a problem) in the face of a constantly changing topology, which is why existing 'mesh' technology only really works for statically located APs.