lakelandfolk

Many thanks everyone, I have spotted a flaw in my suggested plan B. The proposed new position, next to the cylinder, is in a lean to conservatory which of course gets very hot when the sun is shining. I know diverters can suffer from over heating issues so the conservatory would not be a happy place for it. The current set up appears to be working OK so I will leave it as is and and just keep an eye on things. Once again, thank you for your advice.

Is the current set up safe? Should I consider a plan B? I could re site the diverter unit alongside the cylinder but that would be 15 metres and 3 walls from the ct clamp in the meter box and the transmitter might not be able to pair with the diverter unit. In that case I could extend the ct clamp cable, which I think will be CAT5, by the necessary 15 metres and fit the transmitter alongside the diverter in it's new position. ie Cylinder, diverter unit and transmitter side by side, a little bit of work but I can do it myself. I'm 85 but do enjoy a project.

Members 107 Location: Tarleton Author Fitted a PV Mate solar diverter today and our batteries are 100% fully charged. The PV MATE is showing circa 1.5kwh + is being diverted to the immersion heater, however multi test meter on immersion heater shows only circa 140volts AC is being delivered. I note that page 3 of instructions says "installation must be in the immediate vicinity of the water heater" Our PV MATE is about 15 meters from the cylinder via a 2.5 cable, then spur outlet then .5 metres of 2.5 heat resistant flex. Could the 15.5 metre cable run be causing such a big voltage drop?? Confused because when we use the boost function then the normal 230v AC is delivered yo the immersion. Despite the immersion element receiving only 140v ac it does appear to be performing OK. In about 1 hour the cylinder water temp has increased from 43 to 55 degrees. Very confusing. Any ideas/observations would be much appreciated. Quote

Thanks John, I'm still confused, despite the voltage at the immersion heater appearing to be 140v ac the heater appears to be performing OK and the water temp has increased in 1 hour from 43 to 55 degrees. I will try asking ProDave as you suggest

Hi John, today batteries are 100% and PV MATE is showing 1.5kwh + is being diverted to immersion, however test meter on immersion heater shows only circa 140volts AC is being delivered. I note that page 3 of instructions says "installation must be in the immediate vicinity of the water heater" Our PV MATE is about 15 meters from the cylinder via a 2.5 cable, then spur outlet then .5 metres of 2.5 heat resistant flex. Could the 15.5 metre cable run be causing such a big voltage drop?? When we use the boost function then the normal 230v AC is delivered. Any ideas/observations would be much appreciated

Many thanks John, I thought that might be the possible problem. We should get to 100% charge later to day so will keep an eye on the PV Mate

Hello, Octopus recently completed our ASHP installation (£700 after deducting bus) which is performing very well. We wanted to use a solar diverter with off peak grid if required, to heat the DHW cylinder. We purchased a PV MATE solar diverter and Octopus have connected it to the cylinder for us. I am having problems getting the surplus solar function to operate and wonder, because we have battery storage, if the batteries need to be 100% charged first before the diverter can come into action.

Hi John, Thank you, I have managed to set the clock to the current time via written idiot proof instructions I found on YouTube so that problem is solved.

Hello again John, Purchased a PV Mate, same as your Runhu, direct via Alibaba from the manufacturer. Octopus fitted it for us today and have set the grid off peak timings OK but I can't figure out how to set the current time. I am 85 years old and can manage some tech items providing there are idiot proof instructions, which there are not in this case. Any chance you could advise in simple terms how to set the time. Also not sure the unit is diverting surplus solar to the immersion as batteries are 100%, house load is about 350w and cylinder water temp is 48 degrees. however displays on the PV MATE show the following "Water heating off" "Water tank hot" "Heating by solar 0.0kwh" "Hot water DR V:1.06" " Saved to day 0.00kwh" Do any of these readings make sense?

Many thanks John

Thank you, will look at possible supplier. If it does what we want then no point in paying the £350/400 for an Eddi when our objective can be achieved via a more basic bit of kit.

Octopus are installing our ASHP as we speak and are fitting a 250L cylinder with 1 immersion heater. We had an Iboost ( which is now goosed ) in our previous set up, 6.5kwh solar + 19.8kwh battery storage and Direct UVC with 2 immersion heaters, surplus solar and off peak grid, it was brilliant . We would like to make use of surplus solar and off peak grid again but 1 immersion element presents a problem. Would this Runhu unit be capable of automatically switching between surplus solar during the day to off peak during 12:30 and 4:30? or would we need a higher spec product such as Eddi to achieve our aim?

Many thanks, The cylinder is going to be just 1165mm high so I can see that the correct positioning of the tundish will pretty much rule a lower position for the EV

Hello, Does an expansion vessel have to be fitted above the top of the cylinder? Could it be fitted lower down, say at half the height of the cylinder or even level with the base of the cylinder?

Yes, I think we might have space in the boot room for e vertical 200/250L version, but again could we make use of the Solar IBoost? Does anyone manufacture a vertical with 2 x immersion bosses?

The attached image is for a Seconrenewables trade Horizontal ASHP 200L cylinder which would fit our space. Our existing cylinder is 210L and more than adequate so capacity would be fine. It has 2 x immersion heaters so I am hoping it would allow me to connect my existing PV Solar IBoost. ie one heater to surplus solar and one heater to off peak grid. 1. Would that cause any problems with the functions of the pump? Presumably the IBoost would take care of the legionnaire cycle. I want to present this option to Octopus when they come back to do a second survey

I have upgraded the 3 radiators that Octopus specified myself and they are coming back to check. I have also requested that they install the pump outside our conservatory/boot room instead of below the window of our ground floor bedroom. Pipe work will be almost identical and power supply cable 10 metres less. I have also requested that they install a horizontal cylinder in the in the conservatory/boot room in place of their proposed bedroom wardrobe. The later will will cause the loss of valuable storage space and generate additional heat into a bedroom that is already extremely hot during the summer months. Octopus have so far said that they do not have access to a horizontal cylinder in their kit of parts . Another survey is to be arranged and I have offered to source a horizontal cylinder if they are unable to acquire one, there are several suitable ones on the market. I could source a cylinder with 2 or even 3 immersion heaters and would like to continue to use our Solar IBoost, ie surplus solar and off peak grid, and legionnaires control. Would that work? Would that impact on the pump functions? Would there be any issues if the pump was not required to operate for say, 5/6 months of the year? We currently run the house via Solar (plus batteries) and off peak for circa 6 months

First of all thanks to everyone for your interest and advice. Next I need to apologise in advance for my next questions, I feel so dumb sometimes. Still in negotiations with Octopus re ASHP design and cost. My earlier query was about keeping the SolarIBoost, OK we have to take a new cylinder to qualify for BUS. 1. Would it be technically possible and safe to connect the IBoost to the new ASHP cylinder single immersion heater? 2. Is there a timed/switching device available that would, at pre set times, connect the power from the IBoost to the immersion heater. ie 12:30am to say 2am from the grid cable and then switch at say 9am and connect to the available solar cable? So we would have 2 cables from the IBoost into the timer/switching device and 1 from the device to the immersion element. I also notice that the Octopus design includes a buffer tank with an immersion heater, could that be utilised via the IBoost? Why does the buffer need an immersion heater?

I am still in discussion with Octopus re ASHP quotation. We have a spare 32a RCBO in the CU but Octopus say they can not use that but need to take the ASHP electricity supply direct from the external meter box. We have Solar PV and 19kw battery storage. If the supply is taken from the meter as suggested will that not bypass the batteries? We thought the batteries would help to mitigate ASHP consumption. The proposed pump is an 8kw Daikin, what size cable would be required for a 20m run?

Pre installation.pdfRadiator Scedule - address.pdfOctopus ASHP quote.docx First of all let me apologise, my computer tech skills are somewhat lacking. The full quotation is about 25 pages but I have tried to list only those with technical and financial information that might be of interest. My lack of computer skills means some pages are in word and some have been scanned. I hope you are able to view them, if you want more info just ask. In an earlier post I mentioned that I wanted to keep the existing OSO 210L direct electric heated UVC and Solar I Boost, which is only 9 months old and performs really well. Octopus say no, we need to supply and install a new cylinder. I also feel that some of the radiator upgrades will provide very little additional heat but add a sizeable chunk to the costs. I am minded at this stage to take the heating calculations to a local installer who might be prepared to supply/install an ASHP heating system without the DHW cylinder.

Hello, My Octopus ASHP quotation has landed. Not sure if it is allowed but I am happy to post some of it for your crits. It's over 25 pages but I have cut out all the legal/marketing stuff and have about 10 pages of tech info. A couple of issues at first reading are they have recommended rad upgrades that appear to offer very little extra output at a very high cost. Also, I installed a direct UVC and Solar I Boost about 9 months ago and it is working really well and I would like to keep it but Octopus say it must come out. I thought an ASHP installation could be designed to operate CH only? Let me know if it is OK to post selected info from the quote, I don't want to cause any problems, data protection etc. I will try to scan and post the relevant pages which will not include name/address etc. Might be a challenge for me but I will give it a go.

Yes, I was very impressed he was extremely thorough, an ex heating engineer, (knees exhausted) knew his stuff and happy to explain the practicalities of the installation work.

"I am sorry for the delay in getting you your quote. Due to the unique nature of your house ( the fact it is so well insulated and eco friendly ) we are having to do manual calculations in order to accurately design the system for your property rather than using our software systems to help." Hello, Octopus did an ASHP survey ( 3.5 hours) a few weeks ago and sent the above email 2 days ago. I fitted a direct UVC + IBoost to harvest excess solar PV. Works really well, so asked the Surveyor if we could keep that and have the ASHP to run our radiators only. This would require only one radiator to be increased in size. He felt it would not be possible as Octopus supply a "standard kit" I will post details of my quotation when it arrives for your very welcome crits

OK, thanks

Thanks Jenki, so 4mm cable and 32a RCBO??