SteamyTea

It is because it is not turned on for long.

No. The 445W is the peak power the module will make under standard test conditions. Very rare day you actually get that from the module.

So might be time to decalcify.

@Spoogster Do you live in s hard water area and not use any water softening. An extra person in a house will deliver about 200W, or around 5 kWh/day (ish).

Or A watt is a joule per second. J.s-¹. 3,600,000 J is 1 kWh. Joule is the SI unit of energy, not the kWh. I think we should ditch the kills wot our and go for mega joule.

You do, you keep me sane. In years to come, historians will rewrite this, remember the victors rewrite history.

If you use 100 kWh in 15 hours, that is about 7 kW power delivery. Now some of that will be for DHW. Do you may want to go to the next size up to be on the safe side and benefit from a better CoP.

So should polyethylene. Except the whole process. I have never seen steel being mined. Though I have seen iron ore and oil being pulled from the earth.

Yes it will, there is no reason to assume that steel, which is a mixture of more than just iron, will not leach. Most 'tin' cans have a plastic coating these days. Modern landfill sites have to have an impermeable layer to stop leachates anyway. That is before calculating the different embodied energy and carbon, the opportunities to recycle efficiently and effectively, and the overall 'messiness' of the production methods. As always, these things are not clear cut, so research must be done before making a sweeping statement.

Why? I am sure with a bit of research it can be shown that neither a good to put into landfill, but an plastic pot can go in an incinerator and generate some electrical power.

Where are you getting this 2000 to 2200W figure from. The solar constant for Earth is ~1.36 kW.m-2 Module, that use the standard test condition are tested at 1000W.m-2, at 25°C and an air mass of 1.5 kg.m-3 For annual yield in the UK, work on 1 MWh/kWp installed (assuming you don't have a system has shading, and is less than optimal azimuth i.e. North facing.

Well the Brexiteers tell me it is because the majority voted for it.

No, just something I heard from some electricians a decade ago. It would be in the latest electrical regs, whatever edition we are in now.

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