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Octopus tariffs - a quick comparison

 
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Electricity, Tariffs, Monitoring & Providers
Last Post by Batpred 2 months ago
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 nickmorgan
(@nickmorgan)
Eminent Member Member
Joined: 10 months ago
Posts: 16
07/10/2025 5:03 pm  

Thanks for the information in this post, very helpful and informative.

I'm having solar panels installed today and tomorrow, with batteries, plus and ASHP and EV charger. We'll have 6.79kWp of solar panel capacity and 20.72kWh of battery capacity, 5kW of inverter capacity. We're just finishing a full renovation where we've had new windows throughout with very low U values, and we're finishing the project by adding 100mm of external insulation.

I'm very much a novice in this area so would welcome advice on the best tariff to start with our new system. I don't yet have a good feel, let alone data, on what our usage is going to be but i'm hoping that we can mostly use the solar and off-peak energy that we store in the batteries to keep our peak usage to a minimum.

Look forward to hearing your suggestions, thanks Nick

 



   
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 Tim441
(@tim441)
Prominent Member Contributor
Joined: 3 years ago
Posts: 369
Topic starter 07/10/2025 5:21 pm  

@nickmorgan what make/model charger & EV?

What rate can batteries be charged/discharged at?

If compatible I'd focus on Intelligent Go for imports and Flexible outgoing.

That should get most imports at 7p at night for car and fill battery. 

Maximise exports at 15p. You can even force discharge batteries to add to income. There maybe a round trip loss but it czn be worthwhile.

I have ashp, solar, batteries, ev. I may be at extreme end but net cost of elec is probably nil this year!

13000kWh imports @ sub 8p

6500kWh exports @ 15p inc forced exports

Heat pump uses around 6000kWh

EV uses around 2000kwh

Solar produces around 7000kwh

 


This post was modified 2 months ago by Tim441

Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV


   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1223
07/10/2025 5:39 pm  

One other question, @nickmorgan. Do you have, or are you intending to have, some form of central automation system?

If yes, which do you have or are you considering?

If no, probably best not to concern yourself too much with Agile.


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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 nickmorgan
(@nickmorgan)
Eminent Member Member
Joined: 10 months ago
Posts: 16
07/10/2025 5:58 pm  

@tim441 Hi Tim, we've got a Kia EV9 and installing an Andersen A3 charger



   
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 nickmorgan
(@nickmorgan)
Eminent Member Member
Joined: 10 months ago
Posts: 16
07/10/2025 5:59 pm  

@majordennisbloodnok I haven't got to that yet, but am very open to suggestions for best options here too.



   
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 Tim441
(@tim441)
Prominent Member Contributor
Joined: 3 years ago
Posts: 369
Topic starter 07/10/2025 6:01 pm  

@nickmorgan hopefully that's compatible with Intelligent Go. Should be easy to check. Come back if not.

What rate can batteries be charged/discharged at?


Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV


   
ReplyQuote



Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1223
07/10/2025 6:15 pm  

Posted by: @nickmorgan
↑

@majordennisbloodnok I haven't got to that yet, but am very open to suggestions for best options here too.

I think at this point all that’s really important is whether you’re open to putting a bit of effort into pulling everything together into a cohesive system, and it sounds as if you are. Not everyone is comfortable with the familiarisation necessary, so I wouldn’t want to assume.

In which case, it’s more about deciding what you want to achieve and that means letting your plans bed in a bit. Better you choose your automation based on requirements than choose an automation system and try to find uses for it.

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
ReplyQuote
 Tim441
(@tim441)
Prominent Member Contributor
Joined: 3 years ago
Posts: 369
Topic starter 07/10/2025 6:23 pm  

@majordennisbloodnok automation may partly be dictated by the infrastructure?

Make/model of ashp & inverter for starters?


Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV


   
ReplyQuote
Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1223
07/10/2025 7:23 pm  

Posted by: @tim441
↑

@majordennisbloodnok automation may partly be dictated by the infrastructure?

Make/model of ashp & inverter for starters?

Absolutely. That’s one of the reasons I wouldn’t want to make any suggestions yet.

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
ReplyQuote
 nickmorgan
(@nickmorgan)
Eminent Member Member
Joined: 10 months ago
Posts: 16
08/10/2025 12:33 pm  

@tim441 and @majordennisbloodnok We're installing Fox batteries and inverter. The 5kW inverter can output upto 5.5kW but only for 60s, typically it will be operating at a maximum of 5kW. The batteries have a recommend charge/discharge current of 30A of a nominal voltage of 179.2V, giving 5.37kW. And we've got a Grant Aerona 290 9KW ASHP (HPR2909 product code). Thanks again for your interest.



   
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 Tim441
(@tim441)
Prominent Member Contributor
Joined: 3 years ago
Posts: 369
Topic starter 08/10/2025 2:53 pm  

@nickmorgan I don't know best options for your scenario. But you could try ChatGPT. It's usually a good starting point but does not always get things right!

Try this and add more questions

https://chatgpt.com/s/t_68e67a78ab308191a858e17da27ebd6d


This post was modified 2 months ago by Tim441

Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV


   
ReplyQuote
 Tim441
(@tim441)
Prominent Member Contributor
Joined: 3 years ago
Posts: 369
Topic starter 08/10/2025 3:06 pm  

With automation suggestions. Needs checking

 

https://chatgpt.com/s/t_68e67dd61724819184db3b6977cf50bf


Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV


   
ReplyQuote



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