SteamyTea

Not when it is the last firetruck from hell.

Pick that.

Does anyone know how quickly a BMS reacts to a burst of PV power. Seem to remember someone mentioning there system was still exporting because the battery did not turn off the instant the load was removed i.e. it saw the grid as a load. Wonder if it has the same time delay to a charge.

The head looks level. Short night for me, alarm set for 4am.

I would use a decent rule, not the ruler in the picture (that is one I had at school, so probably 50 years old now). Accumulative error is a problem, but this is for a house, not precision engineering. If you fit, say that curtain rail dead level, it would show that the ceiling isn't, or the windows. Really just a case of creating a datum and working from that as best you can.

Maybe. But if I wanted to easily set up a new level without moving the laser, below is what I do. Just measure a distance and displace it to the left or the right.

You can just put one mark on the wall at the height you want, set the laser up as close to it as you easily can. Measure the distance from the laser line and the mark and the measured height difference, a distance away. Then join the two marks.

My best has been 73 MPG, think that is 3.9 lt/100km. Takes forever to get places though. So about 38 kWh/100km I filed up today at £1.724/litre, so £6.72/100km or 11p/mile. 300 miles journey in the morning. If an EV uses 300Wh/mile and electricity is costing 30p/kWh, costs 10p/mile. 7.5p/mile at 15 kWh/100km. So at todays prices, not much different. Now I know someone that has just traded their 3 year old Jaguar iPace in for a Ford Mach-E. The jag, which had only been charged on a granny lead, had lost about 40 miles of range (220 to 180 miles, can't get to Exeter and back in it). Now I have no idea if this is normal, or they were unlucky, may heavy footed (or even if they worked it out correctly), does seem a high price to pay though.

I bought one, was even less I seem to remember. Levelled up a shelf and large mirror with it, was great. Next project is some moveable shelves under the stairs.

Unlike @joe90's home. Consider filling the roof with integrated PV. WIth careful choice of module sizes, and no hips, you can get a lot if kWs on. Then connect up as needed. It is expensive to do it afterwards. If you are having a room in the roof, consider not having any windows on the PV side. That way you have no shading, less overheating and enough natural light half the year. North facing windows give a nice light.

Not just the total amount, it is how the power is delivered. If evenings are just a light or two and a TV. Hardly worth getting £3k of storage for a 100W load.

Kim There are no easy answers to your question. But there is basic school physics. ASHPs and jumpers would be normal in any house. Why would you want, in a UK winter, to be dressed in Cornish National Dress (even in Devon). If people want a very hot house, then fit a larger heating system. The way you design, and orientate your house can have a large effect in the energy usage, it is all about surface area to volume ratio. PV on a roof will absorb about 20% of the energy hitting it, helps to keep the rise in temperature down. Cooling can be combined with MVHR. MVHR is usually designed for minimum requirements, but there is nothing to stop you oversizing so that a usable amount of heating and cooling can be delivered/dispersed. An ASHP can cheaply and reliably deliver DHW to 50⁰C. Plenty hot enough for a bath. Just a case of sizing the storage cylinder correctly. Really just a case of sitting down and working with the numbers. Dull and boring, but pays dividends.

Probably no big shocks till autumn, then, hopefully, we will have the LNG supply from the UA and USA sorted out. Though it does depend on what Hungry does.

Gas prices have.

GQT mentioned railway sleepers today. Something I forgot to mention earlier, but thought it was common knowledge. https://www.bbc.co.uk/sounds/play/m0016y5p 26 m 38 s in Just after Snickets.

That should really be ignored in payback calculations. If there is an alternative that uses lower energy i.e. clothes line, airing cupboard, then those numbers should really be ignored.

Obtuse I like it when the angles of a triangle don't add up to 180°C. Makes it more real.

It is easy to see why we do not have much hydro power in the UK. We just don't have the topology for it.

And carbon, hydrogen, oxygen, probably iron, titanium dioxide, cobalt, copper in trace quantities in the ink. Everything we can see and touch is chemicals.

Should really be just the standby usage. So multiply by the fraction it is not producing.

Grow leeks. Go to seed. Push up daiseys.

We get people down here who have the surname Kent. All proud to be ex pikeys. They always pay with cash.

60 ÷ 7 = 8.6 Seems reasonable.

Just look up the thermal conductivity of the materials used, divide into their thickness, then divide into 1. Round up