SteamyTea

Check the regs about putting inverters and batteries in lofts. Think they may have stopped it because of the fire risks.

Or just buy in power as cheaply as possible. battery storage prices are still way too high, They need to drop to about £60/kWh to make financial sense. You would save more just buying a Leaf or a Zoe, or not getting dogs. https://www.amazon.co.uk/Time-Eat-Dog-Sustainable-Living/dp/0500287902

You get more hours of daylight in the peak generation period than down south, that will account for a bit of it. You are 7° North of me.

If you have more modules than seems necessary, you get more power at the lower end, even allowing for the inverter's lower efficiency at part loads. It is all a balancing game and using averages.

Well assuming 70% of 20% is optimistic. As you are putting some of it on a flat roof, you get a lower yield than on a pitched roof.

Go to PV GIS and see what the calculator works it out as. https://re.jrc.ec.europa.eu/pvg_tools/en/#PVP

CoP is Coefficient of Performance. It is just the term used to express the difference between Energy In to Energy Out. So a real fire may have a CoP of 0.25, a car engine 0.27, a normal gas boiler 0.70, an electric immersion heater is 1. Heat pumps range from just under 1 to about 5, depending on the temperatures involved.

We looked into use them on a project. Decided against them in the end. Your roof would need to be able to support the extra static load, as well as the dynamic wind load (that was out problem, too windy, too often, down here).

Yes, and is probably the easiest and safest way to do it.

Or purchased from Italy. Many goods are made in China, to a high quality, reliable delivery and legally. I would start pushing the UK supplier/agent for a better price. Or pay with a credit card/paypal and claim on section 75 (or the PP equivalent) if it goes wrong.

Yes, it soon adds up. The only thing on that list I have is a fridge.

When my old fridge dumped its gas, was running constantly, but still cooling a little, it used about 3 kWh/day. My new fridge (3 or 4 years old now) is so much better than the old one, which was about 12 years old when it failed (think I go it in 2005). I logged my fridge separately a while back, when I was away. If I remember correctly, it drew an average of 5W, Our old mate Ed Davie has a write up about fridges: https://edavies.me.uk/2008/11/house/energy.html

You can see that in the charts from @joe90's I put up. His base load is around 400W.

It is not pressure, it is flow rate. In a gravity system, flow rate is affected by the distance between the shower head and the loft tank (what gravity does). You may get away with larger bore pipes (probably easier to give it a go than calculate it). I have a very cheap shower pump that works well. Just make sure your cylinder and loft tank can cope with the flow, you don't want to drain the loft tank while using the showers. Pumps are a bit noisy though.

Why I have done things to reduce them. First chart is all my power draws. 41% of the time during 2020, I drew nothing at all. Then 39% of the time I drew less than or equal to 100W. Second chart zooms in on the 0 to 100W window. The main power draw is between 29 and 42W. Most of that will be the fridge and the PC charging.

Looks like a plastic tank. Just move it if all the holes are still in the right place. If you use a vented system (looks like that is what you have), then there is no mucking about with certificates and annual checks of a G3 unvented system.

Get them to design it, they may learn something.

They are both ghastly. One is brutal and the other is a 300 quid shed.

Apart from clothes washing, I don't have the others. That must be the secret. And living alone.

Probably not, but as you say, there was one disinfecting cycle.

Why is it drawing at all? This will make calculation difficult as you will not know when the PV is exporting, and how much, or when the HP is on. But the good side is it should reduce you imports.

Ewwwww He is just passing though, bit more thrutching and he will be outted.

And Boomers, and probably most other sectors of society. Don't forget the senior IT managers, and people that like data. The feeble minded. Oh, and the press/media. Just about anyone that is not 'privy' to his inside information, which comes from who knows where, but has to be true, he says so.

It is more me, but then I have never used an Arduino. There is a MicroPython system for the ESP2866. Does this new RPi have wireless/Bluetooth built in? I see it has an RTC

@joe90 Basically, as ~45% of your usage is fixed load i.e. MVHR and Sewage Treatment, which cannot be time shifted, and your ASHP loads are small, peaking at 70% extra (in winter), and as you know, you don't have the heating on for long, there is nothing to be gained by swapping to E7 as you generally need to shift 80% of your load to the 7 hour window. E10, if you can get it (I can't) may offer a slight financial advantage, but it is pennies, not pounds. Really down to finding the overall cheapest price.