Charger from 4kW to 7kW?

  • Hi Moritz,

    Thx for all the posts and effort… 💪💪💪

    Simple qst, if i do the mod (ED4, i assumed, as mine is 2017) to increase charging current (to 32A) it will also take it through home charger, or higher amperage will take place only on charging stations (here ac 22,1 kw)?

    Thx in advance for reply,

    Sasa, Croatia

  • Hi Moritz,

    Thx for all the posts and effort… 💪💪💪

    Simple qst, if i do the mod (ED4, i assumed, as mine is 2017) to increase charging current (to 32A) it will also take it through home charger, or higher amperage will take place only on charging stations (here ac 22,1 kw)?

    Thx in advance for reply,

    Sasa, Croatia

    If your car has the built-in standard 4,6KW/20A Single Phase (230V) charger, an increase to 22KW/32A/400V can be made, by replacing the built-in single phase charger, by a three phase 22KW Charger. MineCooky has done this already. Details can be found in the forum. If you have a 3-Phase home Wallbox 22KW32A/400V, charging would be similar to charging at public charging stations. But I doubt that your home has a utility connection large enough to supply the required 3-phase 400V/32A/22KW Wallbox. Otherwise the home charging will still be limited to 2,3KW 230V single phase (Schuko Plug)

    Ein Hamsterrad sieht nur von innen aus wie eine Karriereleiter

    Edited once, last by Smart EQ 4-4 ().

  • (ED4, i assumed, as mine is 2017)

    Yes, it is. :)


    an increase to 22KW/32A/400V can be made, by replacing the built-in single phase charger, by a three phase 22KW Charger. MineCooky has done this already. Details can be found in the forum.

    It did that with a smart 451. You can't do that with a smart 453, you would have to replace the close to everything, charger, motor and more in the back of your smart.


    Thx 4-4, but my question was about just switching present built in charger (one phase) from 20 to 32 A..

    Depends on your charging station at home. If you've got a 22 kW or a 7,2 kW charging station at home, you can charge with 7,2 kW. If your've just got a 11 kW or 3,7 kW charging station, your are still limited to 3,7 kW.


    From my FAQ: Why does my 4.6 kW charger only charge 3.7 kW at a 11 kW wallbox

    smart fortwo Coupé 451er ED 3,7kW-Lader, 05/2013; > 260.000km (bei 250.000 km 22 kW nachgerüstet)

    smart fortwo Coupé 453er EQ 22kW-Lader, 05/2018 - 05/2021; 109.000km

    smart fortwo Cabrio 453er EQ 22kW-Lader, EZ 04/2021; > 30.000 km


    "Aus Gaspedal wird Spaßpedal"

    - Smart

  • MineCooky

    It did that with a smart 451. You can't do that with a smart 453, you would have to replace the close to everything, charger, motor and more in the back of your smart.


    Why? The Smart 453 is also available with a 22KW charger. I understand that an exchange of the charger is a bigger project, but isn’t is comparable with the job you did to your 451?


    PS: as I understood, an EU Smart can only be charged with 4,6KW. 7,2KW is only programmed for Smarts exported to the UK, as they mostly don’t have 3-phase home utilities.

    Ein Hamsterrad sieht nur von innen aus wie eine Karriereleiter

  • Thx M! My concern was only not to overload the home wires (shuko monophase) if allow 32A charging… so, basically, if i switch to allow 32 A, it will speed up charging at stations (7,2 kw) and it’ll remain the same back home (3,7 kw)? Correct?

  • Thx M! My concern was only not to overload the home wires (shuko monophase) if allow 32A charging… so, basically, if i switch to allow 32 A, it will speed up charging at stations (7,2 kw) and it’ll remain the same back home (3,7 kw)? Correct?

    Where do you want to switch to 32A? Do you plan to override the 20A/4,6KW limitations, and allow 32A monophase 230V? Generally the charging system checks the Amperage of the charging cable, the built-in charger setting and the home connection, and selects the lowest value for the charging Amps.

    Ein Hamsterrad sieht nur von innen aus wie eine Karriereleiter

  • Where do you want to switch to 32A? Do you plan to override the 20A/4,6KW limitations, and allow 32A monophase 230V? Generally the charging system checks the Amperage of the charging cable, the built-in charger setting and the home connection, and selects the lowest value for the charging Amps.

    Yes, mod only by overriding the limitations (this topic is about it, correct?).. can this take higher current value also from home schuko monophase? I don’t need faster charging at home.. only on stations can be a huge improvement!

  • Thx 4-4, but my question was about just switching present built in charger (one phase) from 20 to 32 A..

    The maximum I managed to achieve on a home EU shuko socket is 12-13A. I am also limited by a 16A limiter. At a public charging station with a minimum power of 22 kW, I can easily charge with 7 kW

  • Why? The Smart 453 is also available with a 22KW charger. I understand that an exchange of the charger is a bigger project, but isn’t is comparable with the job you did to your 451?

    Because in the smart 451 the 22 kW charger is a stand alone charger, in the 453 it's integrated in to the motor and inverter. So you have to replace both.


    Thx M! My concern was only not to overload the home wires (shuko monophase) if allow 32A charging… so, basically, if i switch to allow 32 A, it will speed up charging at stations (7,2 kw) and it’ll remain the same back home (3,7 kw)? Correct?

    The car can do 32 A, but if the charging station doesn't allow it, it does what the charging station allows it to. So yes, at home it will still be 3,7 kW. :)

    smart fortwo Coupé 451er ED 3,7kW-Lader, 05/2013; > 260.000km (bei 250.000 km 22 kW nachgerüstet)

    smart fortwo Coupé 453er EQ 22kW-Lader, 05/2018 - 05/2021; 109.000km

    smart fortwo Cabrio 453er EQ 22kW-Lader, EZ 04/2021; > 30.000 km


    "Aus Gaspedal wird Spaßpedal"

    - Smart

  • But watch out!! The standard Schuko-Connector only allow 10A over several hours! The Utility-Adapter with Schuko, supplied by Smart, along with the car, charges only 10A => 2,3 KW

    Ein Hamsterrad sieht nur von innen aus wie eine Karriereleiter

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