JohnMo

I'm running 3 inverters. 1kW, 3kW and 3.6kW. I take 3.6kW and 1.0kW in to a small consumer unit with C Curve Type A Double Pole Compact RCBO (Bi-Directional) as they feed down the same cable to the house. None of the inverter talk to each other - its crude but no issues. Over clocking the inverter is easy enough. The 3.6kW has 5.8kW of panels connected to it (within voltage limits). I just accept that at around midday a whole chunk of electric could be clipped off. I have over clocked for winter performance, not summer in summer I generate a tonne anyway. The 3kW has export control and can switch the whole array off if the battery is full and I am at my export limits. Our voltage today has been about 245V at some points I was generating 6.5kW.

I was over run with vermin, used bait stations, first year got though loads of bait, now bearly any.

Think you either have to expect the following 1. MCS uplift in prices for everything then a vat reduction - overall expensive cost. 2. Buy it all yourself, pay the vat, either install yourself or get your local electrical guy to do it. Lower cost overall. I would leave original install untouched. Do the battery AC coupled then it's a stand alone job no scary PV involved for you electrician.

And it starts tomorrow!

Are you a big building firm massaging the results. I installed MVHR and happy with the fresh air feeling every day. 5 years in shower silicone looks nice and white, so bathroom well ventilated.

Definitely - vaulted ceiling are great. People seem to think they make a room hot and stuffy or takes loads of energy to heat up. But it all depends on you heat the room. High temp radiators, heat goes to fill the top of room first, so yes it does take a lot energy, air con in heating maybe the same. UFH gives a very even spread of heat, top of a vaulted room is hardly any warmer than anywhere else. Summer solar gain the heat can fill a big void above your heads first.

But build in Scotland to airtightness better than 3 it's mandatory.

I had one in 2012, was great for around 5 years, the gremlins started, replaced bit after bit as each one started to fail, then more expensive bits started to fail and then I chucked it to the recycling centre. 2000m² will need a good battery capacity, get one that is self guided doesn't need a wire guide around the lawn.

I just went one step beyond you, now just do DHW heating via the immersion on a simple immersion timer. Energy used overall not much more than the heat pump. Long pipe runs, slugs of cold water... Big heating session when we have used plenty of hot water, ASHP is definitely cheaper, smaller top up heats immersion is cheaper, overall it balances out. You can also install a super simple system if you wanted. Two pipes to UFH manifold from ASHP and you have heating and cooling sorted.

Is this new potable water or waste water treatment. What does Document H actually say you need? If doesn't ask for anything tell them it doesn't.

MVHR is ventilation. Aircon is heating and cooling, it's not ventilation. You need both ventilation and heating. MVHR doesn't solve the heating and Aircon doesn't solve your ventilation requirements. Your builder is talking out of his .... MVHR or another ventilation system is a must have. It's not something a heating appliance will replace

Think you have chosen it, easy enough to do yourself.

Home assistant uses the IP address and you can change anything you want from there, same as the Monitor app does. So fingers crossed. The phone app is useful to find the IP address, mine seems to have changed a few times, no idea why.

All sounds dinky. My balcony structural engineer designed, was a combination of 10x2 and 6x2

Yes all UFH plus one fan coil. I have found raising flow temp 1-2 degs higher than I thought was needed, at higher oat has allowed more controlled modulation, have had to use a high limit thermostat set at target house to kill the heat pump off though. The lower the flow temperature the higher the minimum output. It could be you are at or below min modulation and boiler is protecting itself, instead of switching off.

Had an email the other day saying cloud services were now going to charge via a monthly subscription. Sort of raised a warning bell. Will do things other ways, locally via home assistant and or Monitor for GivEnergy Inverter.

Those flow rates are higher than my heat pump, it's generally settling down to about 0.36m³/HR, most the time

Isn't this why structural engineers exist? Plus with drops you should have a structural design certificate anyway. Other than that no comment

It may bring you presents if your unlucky.

I'm more worried about more wild stuff coming in for the night.

She has a lot to answer for, energy market (oil and gas given away) etc as well. Plug in solar, if you get a fee for registration, who will bother registering? Suggest no-one.

We have opening doors on to our decking in all bedrooms, but you can't really leave those open, an open window while sleeping, is very different from an open window for a sense of security.

MEV is a single fan unit with all wet rooms feeding into a single unit and then to a single outlet through the roof. Get an intelligent one that alters fan speed based on demand, and install humidity activated extract terminals. Then add humidity activated trickle vents, for a fully demand operated ventilation system.

People say the same for timber construction, which is standard building method in Scotland. No one has issue with finances or sales. External insulation has been given out free for ages by the government, so not seeing the issue there either. Personally I wouldn't do block or cavity build, it would be ICF or twin stud timber frame, as I could do both myself.

If your a new build that is pretty airtight with MVHR and decent insulation, unless the house is 400m² I doubt 7kW is correct, especially near Cambridge.