Choosing the Right Generator: 8kW vs 12kW for Putzmeister MP25 Plastering Unit with 40-50m Cord

Hello,

I plan to connect the plastering unit to the power generator, but I'm not entirely sure what power the latter should provide.
I need the generator to provide adequate power for start-up and continuous operation during plaster application.
I will add that the power cord between the devices will be about 40-50m.
I have 2 power generators to choose from: one with a power of 8kW (10kVa), the other with 12kW (15kVa).
Which one will be suitable? Or is it still not enough power? I will be grateful for a hint.

The plastering unit is Putzmeister MP25, which has the following specification:

Pump - D6 Power
Pumping pressure - 40 bar
Compressor - 0.55 kW / 208 l / min
Pump drive - 400V, 50Hz, 5.5 kW at 392 rpm
Tank drive - 1.1 kW at 23 rpm
Water pump - 0.78 kW at 3.4 m³/h

The first one is rather out, the second one should be fine if it really has 15kVA

tora302 wrote:

I will add that the power cord between the devices will be about 40-50m.

I don't understand this at all. A power generator is a mobile device, so why use such long power cords?

Why is the first one too small?
Turns out it's just one time.
The power supply distance has nothing to do with the power of the generator - it's a matter of voltage drop and proper cross-section selection.

kwantor wrote:

Why is the first one too small?

The loads are themselves inductive, so high apparent power is needed. The first one is too weak.

It depends on what the launch conditions are - but it can indeed be a problem.

The first is out of the question. With an inductive load (motors), the power of the generator is multiplied by two. The active power of the set is about 8kW, so the power of the aggregate is 16kVA then it will work efficiently. As you can see, even the second one is quite small, but once you have it, you can try with it.

12pawel wrote:

The first one is rather out, the second one should be fine if it really has 15kVA

tora302 wrote:

I will add that the power cord between the devices will be about 40-50m.

I don't understand this at all. A power generator is a mobile device, so why use such long power cords?

An apartment in a block of flats on the 5th floor will be plastered. Unfortunately, there is no other way to connect the plastering unit (there is no power socket available in the block), but I guess that the power generator produces too much noise to stand on the balcony or in the apartment. Hence, this aggregate will be placed under the block, and we will lead the electricity to the apartment via a cable.

So I understand that the other 12kW may not be enough either?

have a look here link

Instead of an inverter, you can use a soft-start /a little cheaper/ and then the power of the generator is enough if it is twice as large as the largest motor, i.e. 12 kVA is enough.

We have done this for a 55 kW motor and a 100 kVA generator, it starts without any problems on soft-start..

I would like to add that this aggregate is at stake: http://www.sklepwojcik.pl/?p=708

The manufacturer states:
power nom. 13.5KVA / 5.0KW
The request will not work.

OK, so I guess there's nothing left but hand plaster.
Thank you for your help!

The one from the last link has 15 kW so it will do.

I do not know if the question is still valid, but I will write from experience that even the second 12kW is not suitable. In plastering, all engines start at the same time, which already gives food for thought. At 15kW, if it starts smoothly "dry", then the start of a loaded plastering unit (loaded 5.5kW motoreducer) will look like an epileptic attack - and neither the unit nor the plasterers will be satisfied.

hello. I admit that the topic interests me. I have the same problem as my colleague tora302. I have another machine. Pft Ritmo xl. with motor 5.5kw + compressor, etc. total about 7.5kw. I start the 5.5 kw motor separately and later I can turn on the rest. the machine works on 400 and 230. I called a few manufacturers of similar machines and they all talk about 15 or 16 kW. You also write about 15 kW. the matter is clear.
Question: what brand? I want (it would be nice) to spend about PLN 10,000
I can't afford a Honda. I know there are fake hondas. and I haven't heard about others, they are NONAME for me. do you have any opinions? what brand does the job?? I was thinking about a liquid-cooled diesel. Regards

In each aggregate, you can manually turn on the engines separately, but you won't do it when you release the mortar - they must start together, well at least the water pump with the mortar - then you can attach the compressor and basket if it has a separate engine. And I think you know very well what eggs are like, when the glass dries up and the motoreducer cannot move it, then even after a short downtime, these 15kW may not be enough (as with a long power cord). For comfortable work, it is really worth looking for a more powerful aggregate, because these 15kW is such a minimum, and more combinations will be at the machine itself, like robots.

hmm. You know, if you're right, I'll listen to you. It sounds sesownie. How much would you propose. 18 is enough? It's probably not worth $10,000 then. What brand do you suggest?

What do you think about this ?? It's like NAME to me. but it looks good.
http://allegro.pl/show_item.php?item=3101372702

when the water pressure is adequate, the pump is not needed. Always 0.7kV in "pocket"

it so happens that I do not have a water pump in this model. But at some point, she'd rather have to be attached. otherwise, I'd rather not recommend a self-leveling screed. To be honest, I haven't used Ritmo yet. Still in PL. will be picked up in early May.

tora302 wrote:

An apartment in a block of flats on the 5th floor will be plastered. Unfortunately, there is no other way to connect the plastering unit (there is no power socket available in the block)

There are never power sockets in the block, but there are 3-phase power strips in floor switchgears. You apply to the power company for a power supply permit for the duration of the work and connect the extension cord and that's it. That's what I did and that's what, for example, scrapers do.

The friend's solution makes the most sense eljarkos

For comfortable operation, a generator of about 20kVA
Petrol prices of this capacity oscillate around PLN 20,000
22kVA in the open version without housing costs about PLN 15,000 net
Diesel 20 kVA is about PLN 20,000 net

Thanks a lot for the info. So far, I can do it on 230. I only worked with clients who had 400. I bought a car and I don't have money for investments this year. I hope that in January the pradotworczy will appear. Regards