Marvin

Yes, perhaps proper function but form needs improvement.

Hi @mrbd Yes it looks worse than it is. The top DC isolator isolates string one only and the lower one isolates string 2 only. Here's the mathematics. The percentages are related to the inverter maximums: Set up Quant Watts Longi 320 watt panel 1 320 Watts amount of panels 16 5,120 Watts 85% Inverter Max 1 6,000 Watts DC isolator max amperage String wattages String 1 7 2,240 Watts 56% 7.84 String 2 panels 9 2,880 Watts 72% 7.84 Maximum string 4,000 Watts Panel voltage panels 41 Volts String 1 panels 7 286 Volts 48% String 2 panels 9 367 Volts 61% Maximum string Voltage 600 Volts

Gravity?

Am I done?

Forgot to stick on labels.....

Am I done?

You have @SteamyTea to thank for sharing the report.

Yes. I think that anyone who's thinking of ASHP should read it. Fortunately our installation follows the recommendations, and now we're fine tuning the set up.

What is the floor constructed of?

In our neighbourhood, for some reason, our PV seems to be producing power even in the night.... 20211214_225256.mp4

Well, I think you should read pages 62 63 and 68 of this report. It will give you some understanding. https://forum.buildhub.org.uk/applications/core/interface/file/attachment.php?id=50188 Good luck Marvin

Will you have Thermostatic Radiator Valves? Do you expect to use a Buffer tank?

Will this help? https://www.british-gypsum.com/specification/white-book-specification-selector/internal-partitions-walls

Hi @SuperPav. We have had no issues. No problem with sound or vibration. We have to consider our flat roof because it has 200mm of insulation sandwiched between two sheets of OSB with EDPM on top. The 80kg ASHP unit may be able to compress the Celotex insulation and cause a problem, we will find out. Good luck with your design Marvin

I have just crossed wooly tie off my Christmas list.

Watch out for the technical details on the RCBO. Mine had to be 0.1amp

All I know is it works like that. I think you can put the inverter and RCBO before any load. So both in the garage before connecting to the house cables. You need to check what your equipment says is required. The RCBO requirement was a real bind.

All that conversation is in the report you loaded up! Also minimum 10 minutes ASHP on per cycle, and so on...

Any one thinking of installing HEAT PUMPS should read from page 62 onward of this report.

Not quite that simple. The book for my solar grid tied inverter shows this: Marvin.

One of the problems identified was the lack of space in existing housing stock for a suitable hot water tank and buffer tank!!!

The report compares boilers with Heat pumps and the systems they use. I think it was comissioned to see if heat pumps were a viable alternative to boilers. For the first time I understand the significance of a buffer tank and am glad I have one. One of the points it makes is that depending on what emitters and what emitter controls your using will lead to the conclusion on if you should have a buffer tank and what size.

A key point for me was about the cycling of the ASHP. Also the relationship between the size of the ASHP, the size of the buffer tank the volume of the system and how its related to the thermostatic valves on radiators. Need to make a few adjustments.... Good to read a propper report. Thanks @SteamyTea for the info

Yes that was already on my list. I PIRed the timber frame walls to that part of the utility room already.