Or split the difference (almost) and go 25A with RedArc . I'd read some RedArc article about the low and slow approach to charging. They basically just said anything under 200Ah is best suited with around 25A charger. That being said, I think that mainly applies to AGM where lithium can handle a much faster charge if you want it. I've seen several builds that went 40A with a 100Ah batteryMy SOK battery order just got cancelled so now it’s back to the drawing board. Any particular reason to get the 18amp victron vs the 30amp?
Less load on the alternator?