Powerful smart plug

Hardware
1

Hi guys,
Any of you with a smart plug that can handle over 4000/5000 watts?
I have z-wave and zigbee.

2

A smart switch commanding a contactor would be my preferred way here. The most powerful plugs i know are claiming 3600 W, and even they are discutable reaching that amount…

3

like a Shelly Pro 1 PM ?

4

exactly, and a 25A contactor right next to it…

5

will look into it, seems more reasonable. How does the contractor works with the shelly?

6

This is the basic, how a smart device operates a contactor switching higher load, than the switch can handle. Quiet easy to translate it to the Shelly.

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7

Thank you for your help

1 Like
8

I don’t know any specifications of plugs/sockets that would allow such high loads.

Typical specifications often allow something like 10 to 16A, for example the “Schuko” socket which is common in parts of europe
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does allow a maximum 16A short term and 12A “continuously” if I remember right. With something around 230V that means the load of anything powered by a smart plug will be limited somewhat around 3kW. :zap:

Depending on the plug it also can quickly decrease, for example the compatible “Euro” type of plug…
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allows a maximum of only 2.5A which will max out around 600W already. :electric_plug:

So whatever you are trying to connect with a load of 4/5kW which comes with a plug - it is certainly nothing one can buy officially. :man_shrugging: (for good reason :point_down:)

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Loads higher than 16A will typically be hardwired directly and not using any socket/plug system. :man_factory_worker:

Sonoff does feature some 25A relays which should be based on esp’s and can be supercharged with esphome :rocket:

9

And that’s exactly my suggestion here above…

10

Well, to clarify, i am waiting for my new hybrid Bmw. The specs refer it will max charge at 3,5k, 16 amp. I was aiming higher for security reasons but I believe the Shelly pro 2 will do just fine to control and monitor charging.

11

Are there any more specs on this? If it comes with a schuko type I really hope for you that the continous load doesn’t go much north of 12A. Why? because if you have a permanent power draw of 16A on a schuko socket/plug combo it will put significant stress on the connection and will over time wear the connection to a point were it might even increase resistance. This can build additional heat on the connection and often ends in fusing/melting plug and socket.

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If you can (you don’t need the charger somewhere else) it’s best to hard wire the setup together instead of using sockets. The wide spread wago clamps (series 221?) are designed for a load of 32A/450V when wire diameter and everything is correctly chosen.

1 Like
12

Also what is this 4000W / 5000W device exactly? Is it 120V? 230V? 400V? I assume AC?

13
14

Car charger, probably schuko socket with maximum power draw of 3,5kW (16A/230V, AC). :zap:

Probably something like this: :point_down:

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Third party chargers often allow to limit/adjust the current to a more sane value lower than 16A which not only helps to avoid overloading socket and plug but also can prolong battery life by charging slower and putting less stress to the cells. :battery:

1 Like
15

Exactly! So you recommend charging at lower charge, right?

16

Well, I doubt that german engineers sell chargers with schuko plug that have a permanent power draw of 16A actually. While the hardware is capable of it and maybe maxes that out for short periods I expect the load to be somewhere around 10-12A for a “long-term” charging.

But without data sheet we might never now :man_shrugging:

That’s always recommend actually. Your battery lifetime can deplete drastically when always making use of “fast charging”. Also if one charges a EV over night it doesn’t matter at all if it charges full within 2.5 hours or within 5 hours :bulb:

17

Thank you for your input

18

In case you want/need to charge with 16A you should ditch the (single phase) schuko socket and go with a 3-phase setup. :golfing_man:

Often this CEE Sockets/Plugs (“Drehstrom”) are used as they allow a continuous 16A power delivery with 400V (that’s over 6kW :zap:)

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Regarding monitoring/control within HA you would than need to measure the power on each of the three phases (for example with 3x pzem004t) and for switching the load make use of a three phase contactor :control_knobs: