How a 5 bedroom detached house & 3 electric cars are powered without bills!

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In this video, I visit a friend to see how he can run a 5 bedroom house and 3 electric vehicles for no cost and he's achieved this by ditching his gas boiler and going all electric with a heat pump, solar panels and a V2H charger.
Dave had his gas boiler replaced on his 10 year old detached house with a Daikin 11kW air source heat pump. As the house isn't that old, it would be well insulated. However, he didn't have underfloor heating and all the radiators were plumbed with 10mm pipework. In a scenario like that, you normally hear that heat pumps don't work well or require huge plumbing changes. Yet in this case, he just had the water tank replaced and 7 radiators were upgraded to dual panel versions, keeping all the existing 10mm plumbing.
On the roof of the house and garage are 43 x 435W bi-facial double glass solar panels, giving a total peak output of 18.71kW.
He's also got a Indra V2H (vehicle to home) charger and is using a 40kWh Nissan E-NV200 as battery storage. The vehicle charges each night on cheap rate electricity using the Intelligent Octopus Go tariff, which costs 7p per kWh. Then the house is run during the day from the solar panels and the energy store in the vehicle battery. Any excess solar is sold back to the grid at 15p per kWh as is any excess energy stored in the vehicle's battery, so it is then ready to be fully charged again at night.
As well as this Nissan E-NV200, he also has a Tesla Model X and an electric Mini which also get charged at home.
The net result is that the house is run on a mix of solar generation (the amount obviously depends on the season) and cheap rate energy stored in the Nissan battery. Then the surplus is sold back each afternoon and evening at 15p per kWh which covers the cost of all the annual imports. So not only is the house free to run, he's also charging three EVs so effectively getting free fuel for them too.
Since filming this video and looking further at the app reporting and Dave's bills, there were some discrepancies. Dave has spent £20,416 on electrifying his home and when comparing the costs with the previous year with the gas boiler, the overall savings are best summarised like this:
* Annual saving is now £5,950 compared to previous year's gas & electric.
* The heating is now run hotter than it was before on gas and it's now also on 24/7.
* The £20,416 investment payback is 3 years 5 months.
* Then after that, the savings are £496 a month.
* They could save a lot more money by reducing the heating to a normal level, but as the exports cover the cost, they don't need to.
This video was filmed in July 2025.

Dave's links:
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For a site visit, see
If you're interested in using Octopus for a heat pump installation, or would like to find out more on his solar installers, contact Dave on dave@oxfordofficefurniture.co.uk
Indra V2H charger
Oxford Office Furniture

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Chapters/timestamps:
00:00 Introduction
00:34 The solar panels
02:24 Solar lighting
02:57 The air source heat pump
05:08 Hot water tank & heating controls
06:39 Old gas boiler removal & minimal changes
07:27 Radiator upgrades
08:50 V2H/V2G charging & battery storage
12:07 Nissan E-NV200 EVs
13:08 Mini Electric
13:59 Cost of Indra V2H charger
14:56 Work EV fleet
15:51 Tesla Model X
20:11 Total installation costs
20:43 Using the Nissan E-NV200 during the day (disconnecting the storage battery)
21:15 Managing the systems
22:26 Annual generation and payback time
26:15 How the systems power the house and work together
27:49 Any negatives to scrapping gas heating & hot water?
29:07 Dave sharing his story
31:00 DNO permissions
31:55 My conclusions & summary

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