Heat Pumps: anyone have one/thought about it?

Still no install date for me. I noticed on the proposal that Octopus were wanting to connect it all up to the spare RCD on the EV charger fuse box that they fitted back in October. This is straight off the main meter box outside via a henley block and if they did it this way then my hybrid inverter would not be able to see the heat pump at all. I can't simply move the CT clamp as its far from the inside consumer unit, plus I do not want the inverter to see the EV charger anyway.

The easiest way would just be a straight swap of the 2 way Live SPD consumer unit the PV is on for a three way and go straight out of the wall to outside. The heat pump only needs a 20A fuse and the PV fuse box comes straight off before the consumer unit. Will Octopus do it though I wonder? They're sending someone to take a look at it all next week.
 
They should, it’s standard for them to install a new board on installs, using an existing is the exception.

Edit: Make sure when they do it, they install a second Henley block on the ‘correct’ side of the EV charger otherwise you’ll still have problems. There needs to be enough space between the Henley blocks to get your CT on.
 
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Ron-ski said:
How did you get that done, random audit or did you arrange it - looks like I'll be using a Vaillant approved installer.

Don't suppose your in the Kent area?
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In Bristol. It was a random selection by Vaillant from the customer list of the approved installer. I knew the installer was good anyhow, but it was a nice validation.
 
b0rn2sk8 said:
They should, it’s standard for them to install a new board on installs, using an existing is the exception.

Edit: Make sure when they do it, they install a second Henley block on the ‘correct’ side of the EV charger otherwise you’ll still have problems. There needs to be enough space between the Henley blocks to get your CT on.
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Yes, this is essentially how it is already.

There's a henley block straight after the meter which splits the supply to EV charger and the rest of the house, followed by a second which splits off before the consumer unit to the PV. It had to be done this way as the consumer unit was full when I got got my solar installed. The hybrid inverter CT clamp is on the line before the henley block, so it can see the house load from the consumer unit.

Essentially all they need to do is replace the mini consumer unit (2 RCDs in it, one supplying the hybrid inverter, the other the solar only inverter) with a 3 RCD version and the third RCD can feed the heat pump. That way nothing else will need to be changed and the CT clamp see the heat pump draw.
 
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They’ll install SPDs as well which is a bonus if you don’t have them already.

Edit: my installation is already covered by SPDs thanks to my GivEnergy gateway but they added some more anyway…
 
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b0rn2sk8 said:
They’ll install SPDs as well which is a bonus if you don’t have them already.

Edit: my installation is already covered by SPDs thanks to my GivEnergy gateway but they added some more anyway…
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Yes, the current mini-consumer unit feeding the inverters has SPDs too.
 
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