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Loads of them around. I have an HT208D which has an inrush peak capture that is handy. Remember on DC to zero every time orientation changes as the earth’s magnetic field is indistinguishable from dc !

Surely ASHP is not a micro-generation system - it is an energy consumer?

Datasheet describes it as 1P+N

To my mind the biggest problem is that all the lighting circuits are on the same RCD - should have split the lights across both RCDs

I can recommend Andrews & Arnold at £1.44 per month for VOIP. Not sure if they do redirect to mobile. I have a Grandstream HT-801 ATA (Analog Telephone Adapter) so I can continue using old pulse dialling gear and familiar answering machines etc.

I have a Rack-A-Tier and love it, it is pricey!

Are you a member of the RSGB ? They have an experienced team on the QRM helpdesk and solar inverters are a big issue - they have sometimes helped. If you aren’t in the UK perhaps your national amateur radio society has a similar resource?

The capacitors do not provide a safety function, on the contrary they only increase hazard. They are there purely for EMI/RFI interference reasons - which are important too. If the live and neutral from the inverters have no relationship to ground then any downstream RCD/RCBO/GFCI (USA speak)...

I know for a fact that the xpelair DX100T fan worls fine from a dimmer live. Even the lowest dimmer setting where filaments barely glowing (this installation had incandescent lights) was sufficient to trigget the fan and overrun time was same as when triggered by higher dimmer settings.

The two way lighting circuit you planned is acceptable but you should know there is another way of doing it that is often more recommended.

I'd go for option 4, two PIR sensors for earliest detection, two lights for redundancy (even LEDs have been known to die!).

Thermomix is German so the designers may be more used to their 220V end of the nominal 230V mains and set the alarm trigger maximum voltage to what they thought adequate but which is too low for the UK? The UK is around the 240V end of the nominal range and allowed to go 254V and that can...

15400 watts at 230V is 67amps. 43amps at 230V is 9890 W - so the manual ratings are a bit inconsistent?

Why do you think that might be a problem?

You can sometimes get incompatible led lights and dimmer to cooperate by having a small filament bulb in the system. You could try 7 LED and 1 filament/halogen?

Can you just not use 13A domestic type sockets and instead a non-standard socket strip like IEC or Schuko or CEE etc etc then Mrs Mop can't plug in the kettle and knock out the server gear?

The light bulbs in old British Rail carriages from 1950s and earlier had three bayonet pins too, so I think the concept goes back a very long time. I always thought the idea might have been to stop BR workers nicking the bulbs for use at home!

Try reversing the cream and jam sequence and see if that cures the indigestion 😁

The hardware side is easy and the VoIP service was straight forward but entering the software settings for the ata was tedious and took a few goes before I got it right.

If you have an internet connection then you can get a box called ATA analogue telephone attachment that permits VOIP calls. It has a telephone socket and does the job your local phone exchange used to do. Some even accept old pulse dialled connections. My favourite model is the Grandstream HT801...