A novice question, but assuming the same 120v AC load, would a Multiplus-II 2x120 in the 24/3000/70-50 version run quieter and cooler than the 12/3000/120-50 version? Running in Invertor mode, not pulling power from Shorepower.
Thanks.
Cheers,
Same load = same losses = same heat
There shouldn’t be much difference.
Matthias, OK, thank you.
My novice brain was thinking that because the 24V inversion to 120V is less “work” than the 12V to 120V, then perhaps that means less noise and heat (i.e. more “efficient”).
Cheers,
Much cheaper, higher efficiency , less copper, less iron, fewer losses, less heat
Hä???
Ludo, When you say “much cheaper” can you explain a bit more?
Also, I should add that part of what is behind my question is I"m trying to decide whether to install a 12v Victron Lithium NV battery bank (4 x 300ah) or a 24v Victron Lithium NV battery bank (2 x 300ah) in my RV trailer.
Of course, I will be pulling not only 120v from the Multiplus II, but 12v also to service the 12v loads in the trailer.
And yes, I understand that one of the challenges with using the 24v battery bank is making sure my Solar panels provide at least 29v - 30v to the Victron Solar Charge Controller to “wake it up”.
My largest potential 120v load will be running two Truma Aventa A/C units (with SoftStart). I know I can’t run them long, even with 1,200ah battery bank, but there will be time when I need to run them for awhile.
Thanks for your input.
Cheers,
Bryan
Google tells me 990€ for 12v, 740 for 24v
Unless there are promotions running in some specific area, Google is likely mixing up models (as it is known to do).
The MP-II 12/3k 2x120 MAP price is $1088, while the MP-II 24/3k 2x120 MAP price is $1145.80
Usually the price is directly related to weight.
The 24v unit is smaller and 1 kilo lighter, why would it be higher priced ?
What has the price and weight to do with the efficiency/produced heat?
(There is not much weight difference)
The 12V model doesn’t contain 250€ more of copper.
That would be 35kg of copper.
The price difference comes from the different production capacity in the factory.
The 24V and 48V are sold much much more than the 12V model and therefore the production is cheaper.
To compare prices you should use the official pricelist not Google.
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Why isn’t for me to determine, I just checked the actual prices from Victron at this moment in time and that’s where they are /shrug/ The 24v 2x120 is in fact more expensive than the 12v 2x120
Official sales price vs street price, two pair of shoes.
But the street price has nothing to do with the production price.
(And the amount of copper inside 
)
Well, we are both electricians, i guess.
A 24/120 transfromer needs less copper then a 12/120 type.
The 12v unit (probably) creates a 2-10v sinewave, the 24v 2-22v.
So theoretically the 24v unit needs 5/11 the amount of copper.
At least this is what i learned in the 60’s.
The ratio is different yes but you can use the same amount of copper.
Some more windings on primary some less on the secondary and you change the ratio but have the same amount of copper.
Datasheet of the 120V units:
They all have the same weight 
It’s magic!
with 24V you have cheaper cable, fusing, etc. to use 
Yep, thanks, that’s certainly in the “pro” (benefit) column.
Cheers,
