I wish I was a Trex

I did, but really I just need one company to come and fit/install, I’m already having to sort the ASHP separately, as well as sorting all the other bits so it’s just another thing I don’t have time for.

The reason for a split unit is the external unit can only be located about 12m from the house. Interesting about the LG re: target temp for UFH / Rads as the ability to do this was one of the reasons it was recommended.

We have a renovation scheduled to commence in April and I’ve been struggling to find a company that are able to take on a combined ASHP & PV project. In addition most of the standalone contractors seem to only be interested if I want the specific package they sell rather than a bespoke system. As such I’m having to source them separately and integrate them. Our property is a 1930s solid brick trad semi with hip roof. We are extending to the rear with a new kitchen extension and renovating at the same time. 0.9u windows 1.5U doors EWI, underfloor insulation, UFH etc. I’m limited by the roof shape being hipped and the only other space is the garage roof. Both roofs will be new /replaced and as such I can use an integrated PV system (I did look at tiles but the cost wasn’t worth it for the generation achieved). The best option I have so far is 6.3kW PV 15 x Tiger Neo N-type JKM420N-54HL4-B 420 Watt panels (the efficiency is bad but the degradation over time isn’t the greatest but I’m limited by who I can get to do a RIF system) the above is split over three arrays as it’s a hip roof roof to the house and the pitched garage roof which is my only option. Orientation of the PV system - degrees from South Group 1: 7 panels with Orientation: 75 Group 2: 5 panels with Orientation: 15 Group 3: 3 panels with Orientation: 105 Inclination of system - degrees from South Group 1: 7 panels with Tilt: 30° Group 2: 5 panels with Tilt: 35° Group 3: 3 panels with Tilt: 35° Growatt 9.9kw battery (3x3.3kwh). tigo optimisers. Growatt Inverter Its more than I wanted to pay, however the company has been very helpful in trying to make something work with my roof, however it is still considerably more than the equivalent on-roof system (if it was a big standards pitch roof) however it seems most installers that do the typical 12-16 panels on a normal pitch roof arnt interested in trying to accommodate the hip and garage that I have. Any comments / advice on the above appreciated, as are any recommendations. Many thanks in advance. N.b: semi-cross posted in ASHP forum.

Addendum to the above is that the LG was recommended as it has low external temperature efficiency. As pointed out earlier I can see a certain amount of sense in using the efficiency of the heat pump in winter over any spare PV direct to the DHW. In summer hopefully there’ll be enough energy that if the DHW is pulling from the PV / Battery ‘on demand’ rather than acting as a thermal store it won’t matter.

Thanks all for the very interesting and informative discussion above. I will admit being a geologist rather than M&E savvy some of it is over my head unfortunately. I do think I have been trying to over think it a bit; however, my goal is to be a green and ethical as possible and thus want to maximise the PV and try and reduce dependency on the grid where I can. I understand I’m never going to be self sufficient however I do want to ‘do my bit’. While I agree I wouldn’t want to support Putins authoritarian regime and I’m more than happy to export excess PV to reduce fossil fuel dependency and to save lining the multinational energy companies pockets, in the grand scheme of things my time is better spent trying to do something about the authoritarian govt the UK is suffering under than fretting over a few kw either way on import / export compared to the difference I’ll be making adopting PV/Battery/ASHP. All of that aside I think just optimising a PV / Battery / ASHP system that is off the shelf affectively will be the best I can do for now. The current systems I have been recommended and quoted for are (after trying to find folk who will only stick 12/16 panels on a standard roof…): PV 6.3kW PV 15 x Tiger Neo N-type JKM420N-54HL4-B 420 Watt panels (the efficiency is bad but the degradation over time isn’t the greatest but I’m limited by who I can get to do a RIF system) the above is split over three arrays as it’s a hip roof roof to the house and the pitched garage roof which is my only option. Orientation of the PV system - degrees from South Group 1: 7 panels with Orientation: 75 Group 2: 5 panels with Orientation: 15 Group 3: 3 panels with Orientation: 105 Inclination of system - degrees from South Group 1: 7 panels with Tilt: 30° Group 2: 5 panels with Tilt: 35° Group 3: 3 panels with Tilt: 35° Growatt 9.9kw battery (3x3.3kwh). tigo optimisers. Growatt Inverter ASHP LG Therma V 9kW R32 Low Temperature Split LG Therma V LT Split Indoor Unit Mixergy 210 litre Indirect, Unvented cylinder Slimline Follow a bit of reading around the issues with Mixergy and Eddie systems on this forum and the comments about efficiency/efficacy/ethics of making a concerted effort to dump the excess PV in to the DHW tank/heat battery I’ve decided that rather than try and be too clever (which I’m not) I’d rather have something that (at least) tries to learn our somewhat eclectic ‘routine’… On the house front the existing solid brick walls are getting 100mm Rockwool EWI, 100mm solid insulation below the suspended ground floor, board over the UHF. New extension will be to latest regs with 150mm insulated warm roof. Replacing every window with 0.9U and door with 1.5U or better. Hoping that will be sufficiently draught-proof and insulated.

I thought as the other thread had already got a bit muddied I’d separate this in to a separate question. Midea ASHP - never heard of them before. Details on the website are spares and technical documents are password protected 🙄. Any one had any experience of them? My solar installer works with an ASHP installer and will do a combined fit of solar and ASHP however they only really deal with Midea heat pumps and im wary of a brand I don’t know. I see they are pretty big in the aircon market but Im concerned about after sale support etc. cheers.

Thanks for the input, the major issue I have with the DHW cylinder is the space requirements as I’m a bit pushed. It would probably have to go in the new utility which might make it a bit cramped in there. Tank wise I was looking at a slim line mixergy but even that is 480mm x 1500mm. the equivalent Sunamp is half the size and would fit under the stairs or under a unit in the utility. However the mixergy I believe will work well with an Eddi controller for PV switching. Also if I understand correctly the Sunamp requires a high temp ASHP so can run at a higher heating temp as well and the radiators upstairs would not need to be up spec’d as much? UFH upstairs wouldn’t be feasible at present. I’m hoping the insulation new windows and heat from the UFH on GF will make up for any radiator deficiency. RE: DHW demand I saw a comparison of flow rate of water a X temp vs Y rate for the Sunamp and another DHW tank and the Sunamp seemed better. Maybe I’m just being paranoid about cold showers… The major problem is that as I can’t find one company to rule them all and install a full system, I’m trying to get a PV and Battery system from one installer and the ASHP/DHW tank and UFH from another. My concern is how they all integrate/interact. PV company is applying for G99. Not being an electrician/heating engine I’m concerned that it won’t be ‘plug and play’ enough that between the two of them and the builder it’s going to be a nightmare… Not that it’s not logistically challenging already, the only place I can put the ASHP external unit is either on the patio or behind the garage, as due to shared access I can’t put it adjacent to the gable end, so it’ll be 12-15m way from either the utility/under stairs for the DHW. The PV inverter and batteries will be going in the garage. Im just trying to understand as well what supporting electrical equipment I’ll need to allow it all to communicate/divert power?

Hi all, thanks for letting me join. We have a renovation scheduled to commence in April and I’ve been struggling to find a company that are able to take on a combined ASHP & PV project. In addition most of the standalone contractors seem to only be interested if I want the specific package they sell rather than a bespoke system. Our property is a 1930s solid brick trad semi with hip roof. We are extending to the rear with a new kitchen extension and renovating at the same time. The proposals include: All windows / doors replaced with modern argon filled A+ rated ~1.0u windows. 100mm external insulation (looking like probably rock wool based on the contractors I have spoken to). 100mm underfloor insulation. UFH full ground floor in screed. New extension to modern regs w/150mm warm roof. I want to replace the gas boiler with an integrated ASHP and Heat battery system that will work with the PV. I have been looking at heat batteries primarily due to the space I have in the house that I can use as a Plant Room and I don’t really like the idea of going back to a hot water tank, I really want better on demand. The ASHP external unit will be about 13m from the internal units. I have been looking at pairing a Valliant Arotherm with a Thermino 210 hpPV-VT (originally as this was the only matched option but I see that they now support Daikin and Samsung also so I guess this increases the options). The HLC suggests a 9kw ASHP should suffice. I have managed to find a company (only in Glasgow 🙄no-one locally wants to do anything other than put 12 panels on a normal roof with an on roof system) who has worked to come up with a 15 panel roof integrated system with three arrays (two in hip roof one on garage roof) for a total of 6.3kW with a 8kw growatt battery. Is an integrated PV/Battery + ASHP/Sunamp feasible without designing / programming a bespoke system? My research suggests that a Eddi controller should do most of what I want, which is ensuring the PV tops up the battery/heat battery before exporting to the grid and supporting all of the switching itself. Some guidance on: Is a Sunamp worth it or are my fears over a DHW cyclinder unfounded (it would be a mixergy unit). Any real world experiences appreciate. ASHP (if Sunamp route) Valliant vs Samsung vs Daikin? Controllers? Assistance appreciated as I have been looking at the for about 6months and don’t seem to have gotten far and the point I need to place orders is, well now basically. Thanks in advance. Note: I’m a geotechnical engineer so most my built environment knowledge stop at the bottom of the grass but I’m keen to learn, just understand I’m not a M&E engineer.