SteamyTea

There is an upper limit that silicon panels can deliver, around 37% I seem to remember. The 20% figure will be a standard test, they can deliver more, but not by much.

Much depends on how little you are prepared to not spend with the 'professionals'. Some on here have spent 100k by getting architects, environmentalist, bat and bird watchers, newts moved, walls and fences, keeping neighbours happy, plumbers and plumbing systems that need certificates. If you really want to build cheap, go to college and get some relevant certificates i.e. Limited Scope Part P, H&S certificate. Or just find a house that is suitable to renovate.

These kind of planet killing (expletive deleted)ers should be charged £5/kWh, and £100/day meter rental. Do they have a BEV 'because they are green'?

Many years ago when I first started lecturing, and was in the process of moving house, I forgot to get my laundry sorted. So went to work with no knickers on. Was delivering my lecturer and then thought, 'i got no pants on, wonder if the students know'. Was a good delivery.

Smart homes are great, until you misplace your phone. What happens when the provider stops updating the service, or removes the service. Have our lives become so busy that we cannot switch a light on at night, or we have become so weak and pampered that the house must be at the right temperature just in case 'we get a chill'. Don't was time, effort or money. Just get your house as airtight and as well insulated as you can. It will be cheaper.

How many sweaty people are currently working in this building?

I understand the concept of this, but usually in a new build, the indoor climate is not the final climate i.e. colder and damper. I would think it is down to the adhesive. Do you know the chemistry of the adhesive type i.e. PVA, PU, acrylic, epoxy?

When it comes to industrial scale generation, PV is a better use of land. Large turbines have been generating pretty close to their maximum limit for about 20 years now, PV (silicon) is only now getting close and has a few more percent to go still. Depends on demand and usage patterns. There is not one size that fits all.

Best thing to do is drive around and see what exterior finishes people have used. If you like them, then find out what they used. Cornwall is a long county, or country, and it will depend what your micro climate is like as to how finishes weather. My house gets battered by the south westerlies, then baked in the few sunny days we get. Even the concrete render is showing its age.

Pretty sure that 4 mm is what comes out the back of the modules.

Don't you mean 3 kWh a day? 3 kW of constant power would be 72 kWh a day.

https://www.solar-wind.co.uk/info/dc-cable-wire-sizing-tool-low-voltage-drop-calculator There you go. A DC cable calculator. Just plug in the details and find that standard 4mm cable will be fine.

Says on the spec sheet that the maximum solar I put is 4.5 kW. 14 of your modules will be 5.6 kW. I may have misunderstood the spec, hard to read on my phone.

The open circuit voltage is a gnats under 50 V. So 14 modules in series will give you 700 V. What inverter/s do you intend to use?

Do you have a data sheet for these modules. There is usually basic specifications printed on the back of them.

Try this https://wind-power-program.com/ Original worked for me.

May have trouble connecting it to the grid. This may help with windpseeds https://wind-power-program.com/UK_wind_speed_database.htm

Most people are fascinated by PV generation for the first few weeks, then get on with life. Most inverters log the data, some even have Bluetooth built in and you view via a simple application on you phone/PC. To be honest, if you do not have a shading issue, don't bother with them. Sell them on eBay.

Yes, they are of use when shading is a problem. But as this is an, as yet, uninstalled system, on a new roof, I was wondering if shading was going to be a problem.

Maybe this is a dumb question, but do you actually need optimisers?

The lower temperature that the heat pump may be working at will increase the time it takes for scale to form in the cylinder, but form it will. Get the best water softener you can. Having lived in Buckinghamshire, where tap water has chalk in it my default, a water softener is a cheap option.

@gramos Are you doing this install yourself? If so, be very careful. PV is, as @ProDave says, deadly.

Driving up to Bucks and Down to Cornwall all the time now, quite happy to deviate to yours and set fire to it.

My SW side has suffered from the wind, rain and sun, but it is 34 year old. So far only cracked in one place that caused a problem. Easily repaired. I think it has to become maintenance item, so just accept that.

Isn't this just bubble wrap with tin foil on it.