24V System MultiPlus-II vs Quattro-II

Good day everyone, especially Victron Team.

I my Farm Off-the-Grid with 24V (80%) and 230V (MultiPlus-II 24/5000). On my Farm I do not need a 3-Phase installation, because the only 400V/3kW motor (circulation pump for my pond) can run from a frequency inverter and I have the possibility to regulate the speed/flow.

This year I have to add two new MultiPlus-Ii in paralle to it to get 12kW/15kVA.

However, my question is:

Why is there a Quattro-II 24/8000 but no MultiPlus-Ii?

And when will Victron provide the nee design for the Quattros?

Have a nice day
Michelle

Quattro 2 is only available in 5kVA, The original Quattro lists a 24V variant, but that is an older design.
Lower voltages are typically not supported on higher power systems due to cabling constraints.
Since the Q2 has more DNA in common with the MP2, that is likely why neither will see 24V beyond 5kVA systems.

The community can’t really advise on product roadmaps and plans, as per our guidelines those aren’t typically discussed here. Victron shares them in other ways.

Hmmm, then I have to make space for a 4th MultiPlus-II

A system of that scale is much better suited to 48V, though that isn’t always easy to do if your batteries prevent it.

The 4 Battery sets SOPzS could be configured as 48V, but I would need for the whole farm a changement which exceeds around 25.000€.

LED Lights, DC Motors (250-5500W), Fridges/Freezer (they run all with Danfoss BD35F, BD50F, BD80F and the BD350GH Twin and changing only this, would cost around 5000€)

My Servers and PCs are 24V too and there is no option to run it from 48V, because my Intranetserver require already up to 600W if use to the max (i use it to compile software automated).

Also my 24V/5kW Diesel Generator would need to be changed (e.G. Pramac P7500i on ACin of the MultiPlus-II. But it is 2800€ and only Bensin98. Have not found a +6kW Inverter-Generator for Diesel yet.

Hence changing to 48V is not an option.

48V is only good, if you never use any DC power.

With a bit of thinking its easy to realise a dual 48/24v system.

Take 48V as primary system, use 24v from the first half of the 48V pack for loads.

The 24v chargers are connected to the second half of the 48v pack.

Use an isolated 24/24 charger to balance the two 24V banks in from bank 2, out to bank 1

Works only in theory.

I have a 24V/12kW motor with a hydraulik pump for my WoodChopper and WoodChipper. Two Battery Sets (=1470Ah) are not enough for it.

On the other side, 48V with only 735Ah are not enough fir a 7kW EV Charger. My UAZ3303 had 62kWh of LiFePO4 Batteries and I can charge the EV only with 7kW (required 2nd MultiPlus-II this year) if my 3 SmartSolar are charging.

The other problem is, that I would need too many Orion-Tr Smart 48/24-16A (380W), to be more precise at least 6.

Oh, I have tried to use the 62kW LiFePO4 (4 sets of 2p 304Ah EVE cells) in my system and each with a 500A BMS, but the peakloads has trigered several times a total shutdown.

One option would be, that I install 62-124kWh of LiFePO4 batteries in 48V and use them exclusively for the MultiPlus/Quattro Inverter, use 2 SmartSolar for the SOPzS Batteries and 2 SmartSolar plus 2 Fronius Primo 6kW for the LiFePO4 Batteries. And as a backup 2-3 Orion-Tr Smart 48/24-16A.

Then all heavy 24V loads can stay on the much more robust SOPzS Batteries which support without any question 2000A loads.

But this would be a major changement in my PowerStation

Replace it with a 3ph 400v motor

Why shouldn’t it, the total power is the same in 24 and 48v

The world isn’t limited to Victron products…

What are your thoughts behind switching to Quattros (or adding a 4th Multi)?
Do you need a 2nd input?

How old is your first MultiPlus?

Why should he replace a working system?
And he wants to build a parallel system not 3-phase.

A 3-phase system with 3x 5kVA MultiPlus wouldn’t be enough to run a 12kW motor.

3×4=12, take a softstart device ( stern/dreieck starter) and the motor will run like a dream.

Would YOU operate a 12kW motor on 24v ?

I don’t think a star/delta starter would work.
A motor needs around 4-8 times the normal current to start.
We usually install a 3kVA Multi to safely start a 1kW cooling compressor with softstarter.

A good softstarter with a slow ramp up could work but that’s not always possible depending on what the motor is actually doing.
And what if there are already other loads running? Maybe 1 or 2kW on each phase?

Maybe not but that’s not the question here.