kla456

I realise this is an old thread, but what was discussed has probably been installed by now? Feedback would be useful? And I have some questions around the same topic. I went down the same road as JamieHamy and installed 3-phase a couple of months ago (£1400), at the same time a 3-phase consumer unit, 3-phase smart meter from Octopus and a 22kW Myenergi charger. I had considerable disruption because SSEN did not finish on time and the 3-phase meter was not installed on the day. Another meter fitter sent later that night (emergency) was not qualified to fit 3-phase and also disconnected the PV installation - anyway! Same as him, I fed the existing single phase consumer unit (including the existing PV inverters and the Polar charger) from the 3-phase consumer unit. I currently have an application pending with DNO for a 12kW PV expansion with 10kW 3-phase hybrid inverter and 10kW of batteries. DNO has asked a question: "I note on your G99 form that the existing 6kW of PV is installed on 1 phase and the additional 10kW will be spread over three phases. Where your generation connection involves multiple phases you will need to balance the generation output evenly across the phases." Not really understanding the question, I replied: "the busbar of the new 3-phase consumer unit will balance all loads across the 3 phases. " And they replied with this comment: "Thomas has come back to advise to add the extra generation then it will need to be balance over three phase as it does not work on single phase." I'm not sure what they are getting at. Are they saying that the existing 2 x 3kW SolarEdge 1-phase inverters will not live happily on the same 3-phase consumer unit as the new 10kW 3-phase hybrid inverter? Also, I have the same Polar dumb charger as NewHome since 2014 and I would like to install a DIN Rail time stitch - wifi ones are available, but are they advisable? https://www.amazon.co.uk/Circuit-Breaker-Switch-Control-eWeLink/dp/B07Q34WYR8?th=1 Then I would have a 7kW charger and a 22kW charger., both switchable by app. The 22kW charger and the PV expansion would not have been possible without 3 phase.

Hello Doigan, I had a Daiken ASHP installed last August . My unit is Daiken Altherma 3 providing space heating and DHW. I am really satisfied and I also expect to improve efficiency next year after I get to understand the system, and make some adjustments. Given the extent of mis-match between your expectations and the system performance, I'm not sure you should be looking to this forum to solve the issues. I spent months of dialogue with the Daiken-approved installer before committing to the installation, including three meetings and a site visit. The installer provided me with 7-page Daiken Altherma Selection Project Report which included: proposed solution overview, selection criteria, system diagram, 6 graphs including estimated energy consumption and thermal output estimates, and a room-by-room heat loss calculation (it did not agree with my own calculation - based on Jeremy's great spreadsheet - but thats another story for a later post, maybe after first year's heating season). I cant imagine how you could be left with a Daiken system that does not substantially deliver your requirements. I expect you have called back the installer? If he did not respond adequately then I suggest you seek recourse, initially with Daiken, and eventually elsewhere until you get what you ordered and paid for.

Looks like that, or something like that. Do you know anyone who installed MMSP? Either from the trade or as a homeowner? I really want to know more whats involved and what type of reports are delivered. Ofgem encourage MMSP and will pay an extra bit of RHI if you install it. I would not be surprised if Daiken (and other heat pump manufacturers) connect to the installation and monitor performance for their own information - but not to providing me with reports, especially if performance is not great and the reports might be used against them.

Yes, the Daiken has an energy meter that shows the kWh used, but I expect Ofgem have set up MMSP for a lot more than that. Offgem pay out a lot of money in RHI and would obviously like to know what performance is being achieved by the various different installations. Maybe the industry does not want that - I dont know, but my interests are with Offgem's. I dont know the detailed information I might get from MMSP, but I want to try it and cant find an installer.

Hello Forum, and many thanks for earlier heat loss discussion and use of Jeremy's spreadsheet during the design stage. ASHP was installed last summer and I can report to be 'snugly and smugly' satisfied so far. A few aspects of the installation did not follow the plan, but the result is very acceptable. For now, I would like to ask assistance to find an installer for MMSP (recommended by Offgem). I was surprised my ASHP contractor would not install MMSP, that Daiken (supplier of the heat pump) could not provide me with an approved alternative, and neither Ofgem nor MCS carry a register of MMSP installers. Although I am subjectively satisfied, I would like to have the performance objectively measured and monitored. Thanks, Hugh

Great! Thanks

I would like if the 'Heat Loss vs Month' tab could display for higher ranges 3000 - 5000 then playing 'what if' in the first tab. The master displays for 0 -1500 range but does not seem to auto-adjust for changed data in the first tab 'Fabric and Ventilation Loss'. Im not competent enough with Excel myself. Very grateful for this useful calculator.

Reply toNickfromwales Thanks for that Nick. In place right now: Saunier Duval F35E gas boiler - pre-retrofit combi connected to retrofit UFH 200mm concrete with 70mm tiled screed 7.5 kW PV diverting by 2 Immersuns. Immersun1 to 200L DHW direct tank1 with top and bottom immersions. Immersun2 to 200L indirect DHW tank2 with bottom immersion (original pre-retrofit tank still connected to boiler). The two tanks are connected serially. Tank1 top immersion is on time switch - the other two taking from the Immersuns. All unvented. EV for local trips 5,000 km/year drawing from wall charger. Attached 2017 energy report She Indoors is hobby user of all types of washing machines (3 clothes washing machines, 2 clothes dryers, 2 floor washing machines) - compared to 1 shaver. She often uses 50kWh/day. Previous points Pre-purchased Daiken indoor wall-hung hydrobox EHBH16CB3V, user interface EKRUCBL2C, hot water cylinder EKHWS(U)200A3VB - all new kit from discontinued project, but no warranty I expect. This kit can be matched with 11kW, 14kW or 16kW outdoor unit. HWC has an indirect coil and heater. Present tense - see above I understand. My question related to possible power vagaries if feeding HP directly from battery storage. Ok Good. Unvented, so leave existing DHW set-up. Install new diverter switch configured for car (Zappi?) - car is at home during day. Dont consider off-peak until get better handle how to get to zero on meter with flexible diverting. Mother-in-law (nice lady) standing in 20 degrees in front of HR outlet delivering 12 degrees declares to all and sundry 'this is air-conditioning making us cold'. Instructs daughter to switch off system and open windows to get 'fresh air' (uncontrolled and unfiltered) at 6 degrees. Yes, time was good few years ago to install PV, now good time for HP, but not yet for PV Storage. Look forward to hearing about your progress. I lost that battle - now they just say no need for heating, and by definition HR. ditto 65% of floors (all GF) is 270mm tiled concrete. I prefer to wait for better batteries (not bring in Sunamp) and stay with that. Might try positioning outdoor unit under a bedroom window. Yes. I grew up in a house with an open fire. Our parents and grandparents got by ok with woollen sweaters. All this kit is a madness, as you said - but passive-standard building envelope is not. Yes, got all that. Will install HP next month leaving flexibility regarding DHW - then wait and watch for a year. There has to be a next stage with more PV and storage - see attached import/export balance. Just wave to us minions as you pass.Scan 2018-8-20 15.23.55.pdf

Hello Members, this is my first post and I'd like to say that I really appreciate Jeremy's Heat Loss Calculator, which took one day to complete (yesterday). The compact one-page format with 'what-if' ability is very, very useful. Thank you Jeremy. These are my current considerations and I'd appreciate any comments and/or advice from members Regards, Hugh

Hello Forum, Near-zero refurbishment and extension of 1955 bungalow into 2-storey family home with PV and switching surplus to domestic hot water. Contemplating Stage 2 PV with storage. Stage 3 later might replace gas boiler with heat pump.