Marvin

Every shaver point I've ever had hums and gets warm.....

For your information. I think the 112 is the 11.2kW model Manufacturer Model Numbers Date of manual Page on manual comment Mitisibishui Ecodian PUHZ 50, 85, 112,140 ? 2 and 7 Turn on at least 12 hours before operation.

On the Samsung ESH ones the crankcase heater kicks in when below 10C!!

Good idea. 4 months? I live on the Isle of Wight. We'll turn it on sometime this month.....

Which ASHP with a decent compressor were you thinking of? Daikin? Mitisibishui? Valliant? ( yes they all have the same challenge that they need a warm compressor....

checking various items we have we found that, yes, the oven on/off on/off along with Air fryer, induction hob, slow cooker, and so on. we live in the world of fast and furious, however, we need a low n slow to get the most out of the PV However on a cloudy day (lots of those) the PV output also jumps about and so to protect the EV charger I have a delayed off relay. The other big thing for us is the ASHP, which also does the on/off on/off. Although this is normal cycling for an ASHP tricky to use the excess PV power unless on a heating element.

May be but we heat the hot water higher than our ASHP to last the next day as well in case there is not enough PV.

Hence the overkill

Well I'm still trying to avoid damaging our ASHP along with who knows how many of the 47,000 other ASHP owners in the UK. I assume the likes of @Conor and @richo106 and others who have the same ASHP as us are aware....

Oh, and 18 degrees off vertical I thought was best for winter....

Old school: Installed after solic and before immersion.

Yes like this set up with a separate meter altogether :

I think the issue has only just arisen because of: Suggested power cuts in the UK in Jan/Feb. Enquiries regarding other, ASHP's instructions stipulating 12 hour on standby before firing up. Me being a mean sod wondering why my ASHP uses 2kWk a day on standby. I think it was expected that ASHP's in the UK would be left on at least standby all the time especially during winter for frost/freezing protection.

Hi @joe90 Is that a Kingspan Aeromax ASHP? Can you not contact the manufacturer?

Yup! just had to work out that WBS meant wood Burning Stove.

Hi @dpmiller. Just a thought. I assume you know our model is a Cool Energ inverTech Air Source Heat Pump CE-iVT9 with a Carel interface. I noticed you wrote about a Sprsun manual, which I had to look up to know what a Sprsun was. M

Would it be the Carel or some form of low temp heater in the unit? Hence the ~90w an hour power usage?

For mine, I checked with the manufacturer to understand why on page 27 it says to 'ensure power is on ahead and heating at least 12 hours for crankcase'

Yes... However nothing these days seems that simple....The ASHP is not on standby all the time because it is used now and then. During the year when the average 24 hour temperature is above 16C we don't need the ASHP on.

Further to @Temp's reply in @joe90's topic Can we keep the lights on this winter? Our ASHP has it's own main electric meter with nothing else connected. Testing over hours, it appears that my previous estimation of the standby power consumption is about right. The results for our ASHP on standby is a rate of about 82-84 watts, so total used for 24 hour standby is 1.968-2.016kWh assuming no power used for the heat protection of the ASHP. This was measured with an outside temperature no lower than 8.8C over the last 24 hours and no lower than 9.9C during the period of measurement. Bearing in mind that the ASHP compressor must be warm enough to work without causing excessive wear, and requires 12 hours of standby after the outside temp achieved rises above 5C, this may mean that we cannot turn the ASHP back on for 12 hours after a power cut! I hope every ASHP owner with the same compressor requirement is aware of the dilemma of either having no heating for 12 hours or risking excessive wear of the compressor. Marvin

PV to hot water and heat storage controls schematic: This system only uses the excess PV power (unless the Solic 200 button to use any power is pressed, and then it will allow any power for 90 minutes). There are three output choices. Firstly to the hot water tank immersion until the tank reaches the temperature set point, then to one of the two storage heaters as chosen. Although some people have mentioned that the Solic 200 (other types I cannot comment about) will limit the power through it, this design is limited to one output at a time which is a maximum of 3kW. When the hot water tank has reached its target temperature the controls automatically offer the excess power to the MK 3 way switch( K8). This part of the system is designed for our home. The choices are power to the hallway day storage heater or power to the timer which switches between the hallway and living room one. Today we stored about 2.8kWh for overnight heating. Any questions, let me know. Marvin

Hi @TonyT It may be relay based but the whole system (MVHR, Hot water, ASHP central heating, day storage heaters, EV charging and PV monitoring, with battery back up still to do) is now about 120 wires, 12 switches and 20 relays. I am still designing and writing up the shoulder season heating which is run off our Solic 200 at the moment, however this will take a few days. We have 'day storage heaters' relayed after the hot water reaches temperature! Checked this out with the manufacturer and they do the same in their showroom office with an oil heater but I wanted it for the night when paying for the power to the ASHP. CT adjustable relays showing supply of over 1kW CT adjustable relays behind protection... Relays to the 3 CT adjustable relays. Far MK 3 position switch (K5) to choose EV charging options Second MK 3 switch (K9) out at the moment: Choosing what level of power to turn the EV charging on with. Switches M2 and M3 and CT Relay which activates green light when car charging. All of this could be installed in one box but we have no room and K5 and K9 switches in kitchen for easy access and the rest in utility room all over the place.

This is the latest system we have: There are 4 CT relay clamps, 3 for the EV charging, (and one will be for battery charging), which are set at different PV output levels depending on the month of the year which decides what rate of PV needs to turn on the charging of the EV. This relates to a 3kW charger and the expected power requirement for the EV on a particular month and the expected production using the PGIS web site calculator. The summer 3.6kW rate is because the house typically uses about 0.6kW and during the summer there are plenty of hours when the power is over 3.6kW. There is of course an override for when we will charge irrespective of the PV supply. When the mains option is chosen a red light indicates this choice. When the car is being powered the green light indicates this. The theoretical result is not as good as I hoped as M2 relay is time delayed to stop the charging going on/off quickly during cloudy/sunny days, and because of the lack of supply during deep winter, however for 4000miles we hope to use about 730kWh PV and buy 70kWh from the mains. This will improve if we manage to obtain a bigger power storage EV as the PV history for hear over the last 15 years shows good days are usually grouped together meaning during winter we might not have used up the power in EV before another glorious day comes around and then have a week of cloudy weather. The only works because the car is plugged in to the EV charger most of the day time. (like today). I'm hoping someone can use this to help them develop a similar system. If you need any info on the parts are, ask. Good luck Marvin

We had the glass oven door suddenly explode! No one near it. Oven not being used or just used. All sitting in another room when it happened. Dry cleaners were informed of imminent arrival.

Search the term Permitted development technical guidance make sure its a UK government site that you go to... or use this link: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/830643/190910_Tech_Guide_for_publishing.pdf Good luck Marvin