gustyturbine

Thanks JohnMo, that is pretty much as I thought. At least in winter I'll be able to import cheap night rate electricity and use that during the day. The heat pump will soon use that up though so I'll use the heat pump until 05.30 in the morning. I should have a full battery then for the days consumption when the heat pump will consume again in the late afternoon/evening. Regardless, it will be much better than what I currently have.

Quick update - I'm having my solar and battery fitted on the 15th of July. Following the installation of the 10.4kw PV and 13.5kw/hr battery I'm going to jump across to Octopus. That will allow me to charge my EV and house battery at night and run the heat pump until 05.30am on cheap rate 7.5p per unit electricity. I can then export PV power at 8p and use/top up the battery during the day. The one thing I'm not sure of is how the battery will deal with a heat pump load as I'm unclear on what the heat pump really pulls during winter. In hindsight I wish now I'd not fitted a Combi heat pump but 10 years ago I could have foreseen this issue.

Right, nothing is ever easy! So, my heat pump has the internal 185ltr DHW tank with an inline 3,6 or 9kw immersion setting. The tank can't take a second immersion. The Boro VB100 tank that sits externally is a buffer for the heating system. I think mine is more awkward as it's a Combi heat pump. so, I think the best option for me is to use the PV to charge the battery and use that to run the heat pump. I'm not sure how the control will operate yet and I need to work out how long my battery will last for. How annoying 😞

I'm with you there Conor. The only reason my GSHP runs in summer is for DHW. I definitely need to stop that heat pump running in summer as it costs financially. There is a point when you're heating water that you won't use for sure and then export makes sense. I'll be jumping across to Octopus once the PV is on.

I've just discovered that my heat pump has an internal hot water tank (185ltrs) with the external Boro VB100. I've contacted Sweden to see if this can take an emersion controlled by the Eddi. If not then maybe a tank replacement is required (larger) that has this ability so I export very little.

Thanks Dave Jones. Worcester Bosch have told me that they feel it's not possible. I need to see if my VB100 cylinder can take an immersion. I'm begging to think that my PV installer might know more when they attend to complete the survey. Having an Eddie control my DHW is key for me so the GSHP runs much less in the summer months.

To provide further information my hot water store is Boro VB100. The heat pump is Worcester Bosch greenstore Combi 11.

Hi all, I had a GSHP installed around 12 years ago and it's been brilliant. I'm now in a position to install PV as I also have an EV. I'm keen to use an Eddie to heat my DHW and limit export. Does anyone have experience or knowledge about ease of integration. My installer tells me that he thinks my DHW heater is external to my tank and can be set to either 3,6,9 kW. He's not sure if an Eddie heater can be added. It may need a new tank? Maybe it depends on the manufacturer or model number? I'm not sure. Does any have any valuable tips and knowledge? Thanks in advance.

TBH I'm not too worried about not being MCS certified. My main aim is to generate the majority of what we use as a family. The DNO also told me that some car chargers don't like too much PV. I have no idea if there is any truth in that either!!

Thanks for the comments all and guidance. I visited the network operator on a separate issue today and we briefly discussed the export limit. They agree that I can export 3.68kw (not 3.9 as I thought) but insisted I could NOT fit 10kw and restrict export to 3.68. They seemed to think that it can cause issues with voltage etc but I'm not convinced.

Yes, you do have a very relevant point there actually. 20 or so in that room.

From memory we have from upstairs working down - Flooring carpet/underlay, 22mm Chipboard, Wolf/Pozi joists with 100mm Rockwool between, Soundboard (plasterboard) below joist with wet plaster skim.

We recently managed to get planning permission in west Wales. It was a battle from start to finish. Initially the Town Council objected following letters of objection submitted by residents (loaded with lies and tittle tattle). We had discussions with the planning officer and he seemed fairly happy with the plans but suggested we move the property 1.5mtrs forward down our field to reduce the roofline. We agreed to this and revised the plans. Spoke at the next Town Council meeting and they liked the changes so no objections. The local member then spoke with the planning officer and he then has a complete change of opinion. Then we needed to drop the roofline still further and hide the build from view. TBH we agreed to all of the demands and shot the letters of objection down in flames. However, for us to get planning we ticked every box the planners wanted. The costs involved and the hoops you need to jump thorough are ridiculous. Even the 10% of valuation costs that go the LA when you sell the property for the first time S106 agreement. It's like bribery. You'd never get away with it in business however the LA can do what they like. I wonder why nobody is building houses? Anyway, we got there and we are actually happier with the design following the changes we made to the design. I wonder if you initially need to submit with a higher roofline than you actually want so you can reduce it when they request and you walk away with the roofline you wanted. It's a game others play with your time, life and money. Good luck and don't give up.

I went 100mm Rockwool and I was extremely disappointed. Maybe I just expected too much but you can hear conversation between floors even if you can't make out the words.

Agreed, that is what I was told during my last build.