Thoughts on integration of Humax MX7 V2G Bidirectional charger with Gateway?

GivEnergy Products GivEnergy All In One
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Any thoughts on integrating the MX7 with the Giv-gateway EV Charger port?

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Hi - did you get anywhere with this? We are getting a V2G/H car with over 100kWh in battery, and would love to be able to use some of that and then replenish with an ev tariff cost or in summer the excess solar we make

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Hi nomis64. Not so far, but please let me know if you do. The Humax MX7 is now available but the accompanying blurb is full of disclaimers re compatibility with which vehicles and which export ecosystems it may be compatible with. This is the future, but it needs some joined up thinking. I suspect they’re waiting for punters like us to dip our toes in and find out if anything works!

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Renault and Kia (amongst others) are both selling current models that claim this functionality and it would be helpful to know if either would integrate successfully with the GivEnergy ecosystem and the MX7. GivEnergy don’t seem interested in producing their own so far, but Myenergi are working on their own V2G version of their Zappy charger.

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My thoughts at the moment (no facts though).

  1. You would need to check the output of the RCBO/RCD to see if it is capable of the total needed e.g current GE EVC is max 7 kWh.
  2. I don’t think the GW FW has the capability to work out or what it would do with power coming back to the GW from the EVC
  3. It may not be possible for the GW1 version but maybe for the GW2
  4. If these devices are built for their own ECO system or standalone, then they may not be compatible with the GW/AIO’s. And possibly discharge the battery’s to the car without a method of stopping that.

It is still a nice thought though having say a 85 kWh battery sat on the drive that can be used for the home etc. I have a GW and 2 x AIO’s, if it becomes possible, I could power the house for a couple or possibly three days (in an emergency)

Who’s going to splash the cash and get one to try. Perhaps if you got enough People interested and we all chipped in £2, you can get one and try it :grinning_face::man_shrugging:t3:

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@TheDragon

Any thoughts Paul, if your brave enough to reply :smiling_face_with_sunglasses::beer_mug:

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Sorry guys I had to ask ChatGPT as well.

Short answer: physically yes (with correct wiring), functionally no (in the way you’re probably hoping)—especially for bi-directional/V2G use with a GivEnergy Gateway.

  1. Basic electrical compatibility (AC charging)

  • Any standard AC EV charger (including the Humax MX7 EV charger) can typically be wired into a supply protected by an RCBO.

  • So in principle:

    • Removing the GivEnergy EVC
    • Feeding a new charger from the same circuit (via the Gateway/consumer unit)

:right_arrow: This part is just standard EV charger installation—an electrician can do it.

  1. The key limitation: system integration

Where this breaks down is integration with the GivEnergy ecosystem:

  • GivEnergy explicitly states third-party chargers can be used, but:

    • They won’t integrate with GivEnergy software or controls

  • That means:

    • No coordinated battery ↔ EV charging logic
    • No native load balancing via the GivEnergy app
    • No smart control to stop draining your battery unless handled externally

So electrically it works, but system-wise it becomes “dumb coupling”.

  1. Why bi-directional (V2G/V2H) won’t work as expected

This is the critical point.

The Humax MX7 EV charger is:

  • “V2G-ready” hardware, not fully active V2G on its own

  • Depends on:

    • Vehicle support
    • Energy supplier
    • Grid/DNO approval
    • Software ecosystem

More importantly:

:backhand_index_pointing_right: A GivEnergy Gateway system is not designed to accept/export energy from a third-party bidirectional charger.

There is:

  • No confirmed support for:

    • EV → house (V2H) integration
    • EV → battery → grid coordination

  • No communication layer between:

    • GivEnergy inverter/gateway
    • Humax (or any other) bidirectional charger

So even if the charger can technically push power back:

  • The Gateway won’t know what to do with it

  • You risk:

    • Export conflicts
    • Anti-islanding issues
    • System faults or shutdown
  1. Gateway + RCBO specifically

Using the Gateway EVC RCBO feed:

  • Electrically fine if:

    • Rated correctly (typically 32A, Type A + DC protection requirements met)

  • But:

    • The Gateway isn’t a generic energy management hub
    • It won’t orchestrate a third-party V2G charger
  1. Bottom line

  • Replacing the GivEnergy EVC with a Humax MX7 (or any other charger):

    • :check_mark: Works as a normal charger
    • :check_mark: Can be wired into the same circuit (with proper checks)
    • :multiply: No GivEnergy integration
    • :multiply: No coordinated battery/EV logic
    • :multiply: No meaningful V2G/V2H interaction with your system
  1. Practical advice

If your goal is:

A. Just charging →

Any charger is fine.

B. Smart integration with battery →

Stick with GivEnergy or use external control (e.g. Home Assistant).

C. Proper V2G/V2H →

You need:

  • A fully supported ecosystem (charger + inverter + gateway designed together)
  • Not currently achievable with GivEnergy + third-party bidirectional chargers.
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I’m sure bidirectional chargers will become more mass-market over time, but at the moment it feels like its very much early adopter phase that you’re paying a premium for.

There’s also considerations like DNO limits and the impact on the EV battery warranty if you’re charging/discharging the battery much faster and more frequently than if you were driving the EV.

I see SigEnergy now have a bidirectional DC EV charger that integrates to their ecosystem. I understand it plugs into one of the MPPT ports on the inverter so in effect pretends to be a large solar panel. Clever idea.

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Thanks for your thoughts which very much aggree with mine. The technology is tantalising but nowhere near ready yet for rollout. Hopefully GivEnergy will introduce their own solution in the not too distant future as I’m very pleased with the AIO and ecosystem.

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Looking again at the Humax-MX7 Data Sheet, the critical disclaimer at the bottom of the 1st page states:

*V2G functionality requires collaboration between vehicle manufacturers, energy tariff providers, and your local grid operator. Availability of V2G may vary depending on region, vehicle compatibility, and local infrastructure. Selling power back to the grid may need a software subscription

The claim at the top of the Data Sheet states:
First V2G Ready Home Charger

There is a lot hanging on the word ‘Ready’ in this claim.
I would steer clear and looks like V2G would not work with GE kit.

Rob

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Thanks Rob, I concurr :+1:

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