New heat pump - should I go for Octopus Intelligent Flux or Octopus Cosy?

70sbudgie

TroubledTarts said:

Do I have to get DNO authorisation if I am just using the power and not exporting to the grid

Yes. For the safety of their operational staff (and equipment), they need to confirm that you can't export to the grid.

(If there is a problem with the circuit feeding your house, they would turn it off at the other end to your house to work on it. They need to know that it will also need turning off at your end and that the batteries aren't accidentally going to export onto that circuit)

QrizB

TroubledTarts said:

QrizB said:

TroubledTarts said:

We were eyeing up the fogstar 15.5kwh for £2499 with an 8kwh inverter and then whatever is needed for install and charging them (I really don't know what we fully need) but I thought we could get that all in for £4k (is that realistic?)

If you don't mind 3 hours of careful DIY, the Fogstar kits are only £1500-ish.

https://www.fogstar.co.uk/collections/seplos-mason-kits

I built mine at the weekend. It was probably 1 hour of actual work and 2 hours of watching the video tutorial and double-checking everything before connecting anything up

But yes, all the kit shouldn't cost more than £4k (£3k if you build the battery yourself). Whoever installs it will also need to get the G99/G100 DNO authorisation.

Edit to add:

There was a guy (with an all-electric flat, E7 and storage heaters) who posted back in 2021 or early 22 that he'd had storage batteries fitted so he could run his flat from off-peak electricity during the daytime. I think he had 6kWh of battery.

It seemed a reasonable idea but the payback time (based on tariffs and battery prices then) was quite long, 10 years or so, and several forumites ridiculed him. Quite unfairly, to my mind.

Eventually the thread was deleted but I occasionally wonder how he's getting on. He'll have benefitted significantly over the EPG period, where there were E7 tariffs with nighttime electricity well below 10p/kWh despite the day rate being 40p or so. It would be good to hear back from him.

That is super handy thanks I was a bit confused as to whether I could build this myself and to be honest even looking now what would 16 x 280Ah capacity be in kwh?.

280Ah x 16 cells x 3.2v = 14336Wh or about 14.3kWh.

TroubledTarts said:

If you have a link to the YouTube vids that would be great as I am all for saving some money.

I doumented my build (if you can call it that , I'd have added more info if I'd expected anyone to be interested) here:

https://forums.moneysavingexpert.com/discussion/comment/81267589/#Comment_81267589

TroubledTarts said:

Do I have to get DNO authorisation if I am just using the power and not exporting to the grid

By the letter of things? Yes. See section 22 of the Electricity Safety Quality and Continuity Regulations 2002.
Will they ever notice? Probably not.

Will there be a problem if you use accredited equipment and follow the 18th Edition recommendations? Another "probably not".

TroubledTarts

QrizB said:

TroubledTarts said:

QrizB said:

TroubledTarts said:

We were eyeing up the fogstar 15.5kwh for £2499 with an 8kwh inverter and then whatever is needed for install and charging them (I really don't know what we fully need) but I thought we could get that all in for £4k (is that realistic?)

If you don't mind 3 hours of careful DIY, the Fogstar kits are only £1500-ish.

https://www.fogstar.co.uk/collections/seplos-mason-kits

I built mine at the weekend. It was probably 1 hour of actual work and 2 hours of watching the video tutorial and double-checking everything before connecting anything up

But yes, all the kit shouldn't cost more than £4k (£3k if you build the battery yourself). Whoever installs it will also need to get the G99/G100 DNO authorisation.

Edit to add:

There was a guy (with an all-electric flat, E7 and storage heaters) who posted back in 2021 or early 22 that he'd had storage batteries fitted so he could run his flat from off-peak electricity during the daytime. I think he had 6kWh of battery.

It seemed a reasonable idea but the payback time (based on tariffs and battery prices then) was quite long, 10 years or so, and several forumites ridiculed him. Quite unfairly, to my mind.

Eventually the thread was deleted but I occasionally wonder how he's getting on. He'll have benefitted significantly over the EPG period, where there were E7 tariffs with nighttime electricity well below 10p/kWh despite the day rate being 40p or so. It would be good to hear back from him.

That is super handy thanks I was a bit confused as to whether I could build this myself and to be honest even looking now what would 16 x 280Ah capacity be in kwh?.

280Ah x 16 cells x 3.2v = 14336Wh or about 14.3kWh.

TroubledTarts said:

If you have a link to the YouTube vids that would be great as I am all for saving some money.

I doumented my build (if you can call it that , I'd have added more info if I'd expected anyone to be interested) here:

https://forums.moneysavingexpert.com/discussion/comment/81267589/#Comment_81267589

TroubledTarts said:

Do I have to get DNO authorisation if I am just using the power and not exporting to the grid

By the letter of things? Yes. See section 22 of the Electricity Safety Quality and Continuity Regulations 2002.
Will they ever notice? Probably not.

Will there be a problem if you use accredited equipment and follow the 18th Edition recommendations? Another "probably not".

Out of interest how much did it cost you for an electrician to hook you up officially?

QrizB

I'd suggest fitting a system should be half a day's work for a sparky who knows what he's doing, and where all the parts are to hand.

Reed_Richards

@QrizB, did you get DNO permission before purchasing the equipment?

QrizB

I would encourage anyone planning a system that needs DNO authorisation (as opposed to one that only needs notification) to get that authorisation before committing to purchase equipment.

I might also be a terrible hypocrite.