Anyone now powering their home / exporting via their EV (V2X)? Tariff query..

Reed_Richards

This what Google AI has to say (which may or may not be correct)

The Zaptec Go 2 does not feature a traditional software export cap or live, standalone energy export capability out of the box. While marketed heavily as a "V2G-ready" (Vehicle-to-Grid) bidirectional AC EV charger, its current limitations dictate how it handles grid interactions: [1]

1. Hardware Ready, Software Pending

The Zaptec Go 2 includes advanced ISO 15118-20 compliance and bidirectional AC hardware. However, as of late 2026, it does not support live export capability as a standalone unit in the UK. Zaptec specifies that full vehicle-to-grid or vehicle-to-home (V2H) export registration requires a broader, certified complete energy ecosystem. [1, 2]

2. Grid Regulations & Export Limits (G100/G99)If you are planning to eventually use the Zaptec Go 2 for power export (once the vehicle and provider ecosystem fully matures), it operates between 7.4 kW and 22 kW. Because this exceeds the standard UK domestic G98 notification threshold of 3.68 kW, it falls under stricter regulations: [3]

G99 Application Required: Your installer must submit a full G99 application to your local Distribution Network Operator (DNO) to get engineering approval for bidirectional use. [3]

G100 Export Cap: If the DNO determines that your local grid infrastructure cannot safely handle full bidirectional power, they will enforce a G100 export limit. This hard cap physically limits how much power your entire household system (car charger, solar inverter, battery) can push back into the grid at any given moment. [3]

[1] https://teslacharger.co.uk/chargers/zaptec-go-2/

[2] https://shop.ukevinstallers.co.uk/product/zaptec-go2-7-4kw-ev-charge-point-black/

[3] https://www.bestchargers.co.uk/g99-approval-v2h-v2g-uk/

QrizB

Here's what Zaptec say about V2X:

https://help.zaptec.com/installation/how-to-install-zaptec-go-2-as-v2g-ready-in-the-uk

At the moment, ENA does not support a fast‑track V2G connection for AC chargers alone. The rules require the full system (vehicle + charger) to be certified for V2G. Because of this, Zaptec Go 2 does not appear under Generation > V2G Charging Device.

...

When Zaptec Go 2 is certified for interoperable AC V2G and any required protection is fitted, the installer will be able to reapply via ENA Connect Direct for a V2G connection approval for the same site.

So it looks like you can't currently install it for V2G (and I suspect you also can't install it for V2H either, unless you disconnect your house from the grid). And as and when it is certified for V2G, you might need extra hardware fitting.

OP have your installers told you something different?

Reed_Richards

The thing that concerns me is that even if you only want V2H, can you stop little bit of V2G? My solar inverter, which admittedly is 8 years old now, can't cope with a high-power device like a kettle suddenly turning off (as kettles do). It ramps the power output down over several seconds and whilst that is happening the surplus power gets exported to the grid.

QrizB

The thing that concerns me is that even if you only want V2H, can you stop little bit of V2G?

You'd need to switch your house over into off-grid mode with the home gateway. Otherwise you're right; trying to V2H onto a circuit that's connected to the grid will mean spilling power onto the grid, which is V2G and needs G99 etc.

Reed_Richards

The OP has not mentioned a home gateway, in addition to their chosen EV and charger. Presumably this home gateway would need to know the state of charge of the car battery and communicate with the Zaptec charger so it would know when to switch between off-grid and on-grid modes?

pensionpawn

Hi all, thanks for all the positive feedback, much appreciated. Having an electronics degree and working in the mobile telecommunications industry for many years I have a reasonable understanding of technology, however I am not an electrician and am certainly not an expert on the emerging processes and procedures related to the bi directional EV solution I wish to achieve, which does include a home gateway for island mode. This is my first EV, so all new to me.

Much of what I have learnt, or misunderstood, in this area has come from my own research (occasionally assisted by Gemini) and conversations with long standing contacts from the solar industry and my current electricians (who I am still waiting to hear from after last week's site survey). Through this I have settled on the Zaptec Go 2 as it would appear to be the best fit (eg, ISO compliance, V2X ready etc) for my circumstances, and not from any fanboy perspective or company loyalty. If anyone wishes to point me in the direction of a better suited bidirectional charger that I should consider, I'm all ears!

I also hear what you are all saying about the G99 process applying to any new additional export capable "product" installed at a domestic dwelling, even if an existing G99 exists, and a capped export at the existing G99 level is part of the solution proposal. However the feedback, informal at this stage, that I have received is that if the SLD (single line diagram) demonstrates how the cap on export is reliably achieved, then the DNO more likely than not just rubber stamp the installation. Once I've seen my electricians proposal I will know more. A thought did occur to me earlier that if the EV / bidirectional charger export can be capped at 3.6kWs, does this process follow the same path as for solar panels, and a G99 is not required. Anyone know for sure?

As soon as I hear back from my electricians, I'll bring you all up to date.

pensionpawn

https://forums.moneysavingexpert.com/discussion/comment/82153185#Comment_82153185

A home gateway is definitely part of my design as although I've only experienced 3 power cuts in 30 years of living in my house, I would be spitting feathers if in the near future they become more regular and my house with its significant green investment is as dead as my neighbours when the power goes off! From my discussion with my electricians during their site survey, that's exactly how they described the interaction between the Zaptec and Home Gateway, limiting the maximum export across solar panels and EV to my existing G99 limit of 6kWs.

Reed_Richards

That's good. Which model of Home Gateway do you plan to use @pensionpawn ?

pensionpawn

https://forums.moneysavingexpert.com/discussion/comment/82153423#Comment_82153423

This is a total unknown to me, so I've left it to my electricians to recommend a particular model. If the forum members have any suggestions, I'm all ears.

pensionpawn

https://forums.moneysavingexpert.com/discussion/comment/82153423#Comment_82153423

Hi there. The electricians suggestion is a Niglon MS100ATS to work with the Zaptec Go 2 and earth rod. Thoughts anyone?