Marvin

Or Is STP cable better as it will need to run near mains..?

I was thinking of using Cat5 cable...

The inverter is 15m of cable from the grid supply.

I would lay the tiles using sand and cement morta. M.

Not sure flexible floor adhesive is a good idea? Was the weight of the wood burner feet (or a foot) on the tile? My old wood burner was bloody heavy! Was the cardboard scorched? My guess would be an un bedded tile on an uneven surface rather than heat alone. M.

Hi What cable type is best to extend the reach of my CT clamp? Marvin.

I think the stud is fine for the weight, however the fixing of the radiator to the plasterboard is not best, in my humble opinion. Lots of things to be considered: What thickness is the plasterboard? Is the plasterboard plastered or drylined? Is the wall in a damp room? Can some of the screws fix through the plasterboard into the stud? Is 35kg the dryweight? Is the radiator going to be on a wall that has passing traffic? Years ago, I worked for a national timber framed house builder. One job I had was going around about 32 houses cutting open walls and putting noggins in where the radiators had been fixed to the plasterboard. The plasterboard had slowly bowed out with the weight. Best of luck Marvin.

Also the outside leaf of the lintel doesn't look like the plain edge of a catnic CG110/100. Again, I may be wrong.

Hi Loz. Can you confirm the opening size and also take a picture looking up at the underside of the lintel?

I do not know if this is the case but if I remember correctly, the strength in the lintel is within the cavity space part which supports the leafs holding up the outside and inside wall skins. I believe it is possible that, if you load one leaf too much before the other leaf it can distort the lintel. Anyway I'm sure someone will correct me if I'm wrong ?. Marvin

The result is that under the rules I have to apply under a G99 application for anything capable of feeding in more than 3.68kW even if the inverter can be limited to 3.68kW I will upload info later on.

For those of you who are not in the know, I am trying to obtain permission to connect my proposed 5.12kW photovoltaic system to the mains electricity using an inverter which would limit the feed-in to the mains to a maximum of 3.68kW thus avoiding having to obtain prior permission (and possible costs) from the distribution network operator (DNO) under G98 rules. The question I am trying to find the answer to is whether this design of a system; able to produce more than 3.68kW, but with an inverter set up, which limits the amount that can be fed into the mains grid to a maximum of 3.68kW, is OK under G98 rules. Latest DNO reply: Thank you for confirming the information below. I have forwarded your email to our MCC Generation Team, if they are not able to assist I have requested that they let me know and I will locate the correct team that can answer your query. Regards

Latest: Email received from DNO raising questions. My responses in red: Does your enquiry relate to a new generation connection or existing connection? New generation feed-in to existing supply Site Address for Generator: My home. Type of Generator Photovoltaics Capacity of Generator: Panels capable of generating 5.120kW but limited by inverter to 3.68kW with ct Clamp. Make and model of inverter: Sofar Solar Grid-tied Inverter Product model: SOFAR 6KTLM-G2 with ct clamp. Import and export MPANS xxxxxxxxxxxx This system has NOT been installed yet.

Latest: Thank you for your email. Unfortunately I am unable to assist with your enquiry as Distribution General Enquiries at Scottish & Southern Electricity Networks (SSEN) are responsible for raising non-emergency electricity network jobs for central southern England and northern Scotland. However, our G59 Protection Settings department will be able to help resolve this matter as they primarily deal with all enquiries of this nature. I have taken the liberty of copying in our DEPARTMENT NAME team into this reply, and I am sure a member of their team will be in contact with you shortly. Kind regards

Oh my! Never take a call on your mobile when your trying to drill holes in a roof. Well it embarrassingly turns out that the call was from Midsummer and not SSE. I had sent an email to both on the same day about roughly the same subject. So I still wait for a response from SSE. I'm sure I will never live this down....

And on the isle of wight which is where I am...

Ok here we go. This is how it's going for me: SSE phoned to ask if anyone had replied to my email. I said no. Gentleman asked what inverter I purchased. I said I would have a look at the invoice. Gentleman asked where I purchased the inverter. I said Midsummer Gentleman asked if I had the order number. I gave the order number Gentleman then told me the inverter I had and he would raise an order for a CT clamp! He seemed to accept that an inverter with a limiter is ok. Time will tell. I will update when there is progress. Marvin

Further delving seems to suggest that ProDave is on the money. I have seen G99 applications when an inverter has a feed-in limiter. Sometimes they are inspected by the DNO to see they are working properly and sometimes locked by the electrician and signed off to the DNO. I wait to SSE's response. M

No clear response over the phone from DNO. Email sent requesting clarity on the following: Under the Energy Network association (ENA) EREC G98 regulations, I understand there is a limit of 3.68kW which can be fed into the network. There are inverters that can be limited to 3.68kW feed into the network whilst handling a home generated PV array above this. Obviously these are G98 compliant inverters. Please confirm these inverters set at less than 3.68kW comply with your requirements under a G98 connection. Kind regards I'm sure I will go blue if I hold my breath... As I have just received the automated response! M

(The thing I like about Buildhub is the wealth of knowledge shared and differing opinions which usually results in a solution! And the people who have the patience to explain - thank you.) I am now contacting DNO....

Yes, you and conor probably will. Have been reading your info. Very interesting. I came across the pump searching for one small enough for our bungalow. We had already renovated and upgraded the insulation, airtightness and installed MVHR. Because we heated the bungalow and hot water only using bottled gas we also knew our energy usage results, which were worse than theory but better than hoped and this helped us choose the unit.

Good question. Yes the only place below the flat roof that does have a wall across the span. I am also not sure about the insulation being crushed, the EPDM being worn by vibration or the vibration entering the building but will react to these if they arise.

Other view...

So, ASHP on flat roof. Boiler going. Now, where the hell do I put the heat pump supply rotary isolator?

Thank you ProDave and TonyT I prefer the inverter with the limiting 3.68kW as, when available, I can use more to charge the car. Also it sounds a bit geeky to start messing around with relays etc and no matter how brilliant it will not impress the boss! Yes we have to avoid the big power items using batteries. We are going to wait for technology to catch up on the battery front...