Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Sustainable Sidetra...
Electricity, Tariff...
Octopus tariffs - a...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Octopus tariffs - a quick comparison

 
Page 3 / 3
Electricity, Tariffs, Monitoring, Electrics & Providers
Last Post by Batpred 8 months ago
26 Posts
10 Users
8 Reactions
8,880 Views
RSS
Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1897
08/10/2025 4:44 pm  

Does indeed need checking, @tim441.

  • Neither Homely nor Havenwise currently support the Grant that @nickmorgan has specified (Homely does do Grant, but not that model).
  • ChatGPT is suggesting Home Assistant should "co-ordinate" with Homely/Havenwise, but neither of them offer that functionality.
  • There does seem to be an Andersen integration for Home Assistant but it's a community-created one and looks to me like it has rather limited functionality and in particular doesn't seem to offer the ability to tell the charger to start charging. Crucially, however, it does at least have the ability - at least apparently - to get the charger's status, meaning the home battery could at least be told to change its minimum charge level to 90% or above so the car can never be significantly charged from the home battery.
  • The efficiency gains from Homely/Havenwise vs a well-configured and installed heat pump already set up with weather compensation are far lower than the marketing blurb might suggest. If Havenwise ever do start supporting Grant, even those marginal improvements might be worth the modest fee but Homely is a different story. The only way I've seen so far for Home Assistant to connect to a Grant heat pump is via an integration that uses modbus and Homely's local box of tricks uses the same modbus connection that would be needed.
  • The ChatGPT report purely looks at the technically preferred solutions and seems to be recommending Home Assistant as the central point. For me, that's a good solid recommendation but then I work in IT. This would not be a good suggestion if @nickmorgan is reticent about setting up a Home Assistant instance; it's not hard but does require a bit of a learning curve which not everyone is comfortable with.
  • If we assume (big if, I know, but we have to start somewhere) that the Grant is set up correctly and is running well under weather compensation, the ChatGPT report ignores the option of simply letting it continue like that, adopting Octopus Go as the tariff and then using the charger app and the Fox app to schedule EV charging and home battery charging during the cheap periods. It's not the optimal solution but it's perhaps 80-90% there for almost no effort.

If @nickmorgan is up for having a go with Home Assistant, that's well worth a try, especially since that then provides a platform for other non renewables related stuff like integrating smart switches, CCTV, home entertainment, robot vacuum cleaners and so on. If not, I'd go with my last bullet point above and keep it really simple.


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"


   
👍
1
ReplyQuote
Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 1 year ago
Posts: 1022
10/10/2025 5:59 pm  

Great summary, @majordennisbloodnok! 

I'd take the home assistant route. Very low investment and the possibilities are endless. 

I cannot comment on whether the Grant heat pump will become popular, but if so, chances are the integration will get better. I just had to switch my car integration to a completely new one as the manufacturer end of lifed the previous API and it took me a few minutes to adjust the dashboards.  


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kw export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
ReplyQuote
Page 3 / 3
Forum Jump:
  Previous Topic
Next Topic  
Related Topics
Topic Tags:  Octopus (9) , tariffs (4) ,
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO