Reduce the power of a heating resistor of 3KW-220v

[BobFuck]

> afterwards I don't know if in the long term it's really interesting
> for energy savings?

no, heating 3kW for 1h or 1500W for 2h is the same (on the other hand, a smaller subscription is cheaper).

> If not possible, as said above, make a voltage divider bridge

not work (another 3000W resistor is needed ...)

> or lower the voltage with an electromagnetic rheostat

it would require a 3kW autotransformer, which would cost more than the adapted resistance that would have had to be purchased originally

> I have no confidence in the electronic assembly presented above

Effectively...

[Forhorse]

In addition the peak current will not change: it will always be 18A, I do not know if the circuit breaker will let through if other devices are connected at the same time ...

The peak current is the same, but the average current is halved.
A circuit breaker is a thermal device (apart from a few rare electronic devices for specific applications, the basic principle has been the same for over a century: a bimetallic strip which deforms under the effect of heat) if it is only heated 50% of the time it will let more current through.

[Forhorse]

Otherwise there are simply load shedders ... you know, this magic device that cuts non-priority circuits when the power consumed exceeds that of the subscription.
Precisely planned so as not to need a large subscription

[BobFuck]

It is magneto-thermal (in the event of a large overshoot, the cut-off is instantaneous). I don't know how the magnetic part would react to direct current ... There shouldn't be any problems.

On the other hand, the load shedder probably costs as much as the resistance!

[fabio.gel]

Otherwise there are simply load shedders ... you know, this magic device that cuts non-priority circuits when the power consumed exceeds that of the subscription.
Precisely planned so as not to need a large subscription

A load shedder is a good idea, moreover on the right corner it is easily found.

By cons I will do a test at home leaving only the thermal resistance in operation, I will plug it into my electrical outlet with consumption meter kwh edf, to know the power and amperage of the beast.

By cons if plugged in alone it causes the meter to trip it is not worth it, there is more than call Mr EDF to go to 6 Kw



For info on the price of the resistance 2 Kw rotex is 492 € HT

[fabio.gel]

Good after the test the resistance is at max at 2700 W, so I top on a load shedder

Thank you for your information.

Fabio

[elephant]

I'm surprised that you have such ridiculously small subscription shades.

In Belgium, the subscription and tariff classes are for consumption and not for maximum intensity.

The minimum available being much higher

(13 amps, not even enough to operate a stove and a washing machine simultaneously)

Let my compatriots contradict me if I am wrong.

[gegyx]

In the past, to avoid taking a subscription over 30A, I had been looking for a moment how to relieve my meter, because during off-peak hours, cumulus, dishwasher, washing machine or dryer on the go, the micro- wave was tiltering.
Ditto the summer when I put the arc welding machine.

So I wanted to unload only the electric cumulus.

Obviously, I tried to do everything myself, contactor, toroid ...
In short ! I waited for a load shedding opportunity in the ads ...

Even if my meter had the HC contact, and the pilot control flash socket ... (which had to be activated at EDF, by paying for the trip), I opted for the old basic model with a torus, which can be used everywhere.

If the torus is integrated in the device, it's better,
to avoid having to search for one, if it is missing with the supplied device.
(The phase leaving the counter instead of being threaded into the toroid (external inductive sensor connecting the load shedder), enters the load shedder, then comes out before distributing the current on the board.)

I had found a Legrand 03810 single-phase load shedder, shedding a single 15A circuit.
But there are others, Hager, Delta Tore ... Now, new, it takes 150 € and 100 or less on ads.
(Must look for a moment for the occasion)

I send you an MP

Since then, I have not had any disjunction problems.

**
I specify however, that I did not install it ....
It is the CRISIS phenomenon, which makes it possible to be careful and calm consumption, the wife who may have finally understood, or even the children who have grown up ...

[Christophe]

Let my compatriots contradict me if I am wrong.

The basic current is, it seems to me, 50 A in three-phase 230V ...

Or a maximum power close to ... 20 kW!



Then we pay 0.25 € / kWh ...

[Alain G]

Wow!

For information here our cookers only have a capacity of 50 amps on 240 volts single phase and our electrical inputs are 100 amps or 200 amps depending on if we heat electric for old inputs now it is minimum 200 amps and for some big houses we go to 400 amps always on the 240 volts single phase, obviously we pay 7 to 9 cents per kilowatt or 0,053 to 0,068 euro at the current rate.