question

Hi there that could easily be achieved by a victron multiplus which would allow shore charging from a supply but would also have to match the inverter charger, eg 240v multiplus input and 120v input are better off being and I think come as two different units, victron probably also have a way to provide what you need I’m sure if you call them or an approved supplier will keep you correct. The multi or Quattro is purchased via the battery voltage you have so would be for example a multi 48/3000/120 would denote, 48v dc battery voltage, 3kva of power also including power assist feature, and 120 amps of current for charging the battery bank, please also ensure you get it setup correctly as lithium have a profile on Victron products. I hope this helps a bit thanks David

We have a somewhat different approach we are going to employ on our 120/240V 60Hz American-standard boat (which will be domiciled in Australia).

We will add a large ~1000Ah 48V LFP battery bank.

The boat has an isolation transformer (240 to 240V, 50 or 60Hz). When on 50Hz shore power we will feed the output of the transformer to a Quattro 48/10000. That will charge the battery bank from 50Hz power. When on shore power it will pass 50Hz power through, and when off shore power, it will be set to invert to 50Hz 240V for any Australian-standard items we install in the future (e.g., maybe a dive compressor).

We will also have two paralleled Quattro 48/10000 units set for 240V 60Hz to power the existing boat stuff via the battery when we're on 50Hz power. American standard power will be re-routed from the isolation transformer to the 60Hz inverters by flipping a switch. These units will also be able to charge the battery from either of our 16kW 60Hz generators.

The one thing that is not covered is 120V 60Hz shore power. That is generally limited to 30A in the US, and for that will will probably install a smaller galvanically-isolated 48VDC charger, with a separate shore power inlet, but this is not a priority until we cruise to that area.

This may not be what you want, but let me ask, why 48V? Unless you are looking for a high power system like we want (and your comments about weight suggest otherwise), 24V should be fine. Then you have some really nice options, like the Mastervolt Chargemaster Plus series - up to 110A at 24V, universal input, galvanically isolated, and you can parallel them if you want more power.

Those curves for the Balmar 48V 100A don't appear to match the curves I've seen at https://balmar.net/wp-content/uploads/2020/09/PDS-96-48-100-K8.pdf

They look more like the 48V 60A curves in shape.

And your curves seem to show the 24V alternators as equivalent in performance.

In theory, you should be able to achieve essentially the same charge curve from 24V and 48V alternators in the same frame, with a little more efficiency from the 48V unit due to reduced diode losses, just by changing the number of turns (and wire size) in the stator.