I’m looking at purchasing the Centaur Charger 24V 60A for my 50A RV. I have 2 Multiplus 3000 Kva inverters wired in split phase and a 560AH lithium battery bank. I want to be able to run off inverters when I only have a 120V/15A AC power source and use the charger to keep the batteries charged. Am I understanding this correctly, this charger will provide 60A DC charging with the 120V/50A AC power source? The reason I don’t want to just hook up the 120V/15A power source to my 50A receptacle using a dog bone is that providing single phase power from the source to this split phase configuration causes one of the inverters to behave normally (pass power through) and the other inverts. I’ve confirmed this through expert sources and through my own experience. I just want see what others thought of this idea and whether it will work. I installed a Victron Autotransformer to an additionally installed receptacle on my RV, and this works, that is, it turns single phase power into split phase before sending to my inverters, the problem there is that voltage runs ~108 on the induced leg, which may cause problems for my A/C and other inductive load appliances.
Running that Centaur at 60A will draw close to 15A from your 120V shore power. You might be better off with the MultiPlus Compact 24/2000/50-120V instead, running it in charger-only mode.
The MultiPlus gives you a similar 50A charging capacity (only 10A less than the Centaur) but adds a key advantage: it’s a complete inverter/charger combo, so you’d have a spare inverter if your main MultiPlus units ever fails.
The AC draw would actually be slightly lower, too - around 12-13A at full charge rate versus the Centaur’s near 15A. More versatility for similar money and power consumption.
The only downside is losing 10A of charging capacity, but unless you’re regularly depleting a very large battery bank, the difference between 50A and 60A charging is usually manageable. And having a backup inverter could be invaluable if you ever need to service your main split-phase system.
Owen - thank you so much for this response, and great points! Will look into this!
If you have room you might also look at an identical Multiplus 3000 Kva so you have a spare. You can set the charger current to what you need I think they are 70A but you can reduce that so you dont go over the 15A shore.