ProDave

Is this space heating or hot water?

If you are talking of burying in in the ground then NO

That is vastly different to a "normal" PV diverter. Your example appears to be turning on the immersion with a relay and leaving it on for a time and re evaluating. A "normal" PV diverter measures PV generation and house consumption (in my case every half second) and adjusts the power being sent to the immersion by burst firing the immersion using a solid state relay. I guess in your case you are using the immersion as a "excess power dump load" so it only needs to be a coarse on or off, with the battery controller soaking up the rest and doing the detailed work.

I previously built a big side extension onto a pebbledashed 1930's house. The pebbledashed side wall became an internal wall in the extension and the plasterer just plastered over it first with bonding then a finish coat. It all worked fine.

That is the controller I have. I very early on worked out you had to get into the mindset of whoever programmed it and there are many things I don't understand about it. I regard it as somewhere to set up the parameters and somewhere to check on it's status. I don't use it for control. Instead mine is set up to use a "room thermostat" to control the heating. That is a jumper option on the control board. Then I have a conventional boiler time clock and room thermostats for the UFH that between them generate the "room thermostat" signal for the heat pump. I chose this method because everybody understands a boiler time clock. It gives you the normal timed options, 1 hour or 2 hour boost, program advance etc.

That reminds me of when I just started work. You could never find an oscilloscope in the winter as they had all been borrowed and were sitting on the floor somewhere to keep someones office warm (Tek 500 series valve scope's)

If you mean products like Multipanel, I and many others have used them and entirely happy with them.

I can't be of much help. Clearly newer versions of the LG heat pumps are very different to my old one that started the thread. Mine cannot adjust the flow rate in the software and cannot even read what it actually is, and if the flow rate is not sufficient (simple flow switch) it trips with the CH14 error requiring a power cycle to reset it.

And I don't think it has been mentioned in this thread yet, that with a well insulated air tight house with mvhr, you will not need heating upstairs even up here in the cold north.

I often wonder why "true hifi" amps get so hot (and waste so much power) You will probably cringe when I describe my "poor mans" surround sound system. It's a Sony DVD player with built in surround sound. The DVD player never gets used, I don't even know if it still works but it takes Audio in from the tv and decodes the surround sound and drives the 5.1 speakers while running as cool as a cool thing thus not wasting much power. We actually have 2 such systems, the one in the other room is Panasonic, that too runs very cool. Both seem to produce good sound.

As above that far north you need a good clear view south preferably without any hills in the way and a steep panel angle. If maximum winter yield is your aim almost vertical will work well. You won't be short of sun hours in the summer.

The tank should not be full to the overflow otherwise any expansion as it gets hot just spills out of the overflow pipe. So 2 problems to fix, firstly the overflow connection so it does not leak next time, then the ball valve so make it shut off at the correct level. Chances are the ball valve can be fixed just by dismantling and turning the washer over, unless someone has done that before in which case it will need a new washer. Or may be simpler to get a new fill valve.

Open up the failed ones and post pictures inside. I bet they can be repaired and improved. I fixed one for a friend where the wiring uses was totally inadequate, rewired it with thicker wire etc and it has lasted years since. Likewise a cheap Chinese inverter failed due to insufficient heatsink compound. 2 new transistors properly mounted with enough compound and that is still working years later.

A small ratchet, if needing to tighten with a long tail, rather than pass it all the way through, double it up and pass the dead end doubled up a little way through and start ratcheting. There is no right or wrong way.

https://www.ebay.co.uk/sch/i.html?_nkw=17mm+deep+socket+3%2F8&_sop=15 If you have a motorists shop near you they should have one to save you the wait for one to be delivered.

I had a similar issue with adjustable spanners. I could never remember which way to turn them to tighten them. Then one day I put 2 down side by sise, and realised one had a right hand and the other a left hand work screw that you use to adjust them. No wonder I could never remember which way, because it depends which one you have picked up.

Batteries don't generate power. They help smooth the peaks and troughs of usage demand and match it to also variable renewable generation. No more no less. so they will be an essential part of a more renewable generation.

To clean such stains from render, I squirt with 50 50 water bleach mic using a garden sprayer bottle, just where the stains are, and let the rain water rinse it off afterwards.

Is the hot water scalding hot when you run the hot tap? i.e. on the verge of boiling? Vented or unvented cylinder? I guess vented as unvented would not normally have a header tank in the loft. The header tank in the loft should be cold. If the water in it is hot or warm, that is wrong. Hot or warm water in the header tank is usually caused by the hot tank overheating and pumping hot water out of the vent into the header tank.

We need photos of what has been done on the other side.

https://www.bbc.co.uk/news/articles/cp959zl5lzko Plans for 18 affordable homes have been refused for a second time amid fears the development could endanger the Welsh language. In September, Botwnnog community council said it wanted a proposed housing scheme in the village to be limited to people who only speak Welsh. It said it would be a "a danger to the Welsh language and the fabric of the community" and the county council, Cyngor Gwynedd, refused to back the scheme.

A more zoomed out photo showing the whole window and how it fits the frame all round is needed to answer if it is the hinge that has slipped or the glass within the window frame that has slipped.

Am I having a DeJaVu moment or have I seen that exact wall discussed here before (by previous owner?)

I recall seeing it mentioned. I questioned at the time how the meter it, and the answer was you needed a particular HP with a built in certified meter from which they calculated the reduced rate for that alone.

We have a seasonal high water table, Mid summer perhaps June or July is the driest. I would never have thought of digging in September let alone October. We were about 1.5 metre without shuttering but needed a pump to keep the water out. BCO inspection and pour same day.