The Sterling B2B units voltage setpoints are user customizable, not just limited to canned choices.
Using one to front-end your LFP bank, so that's the only charger directly touches your bank
lets you avoid having to upgrade any existing charge sources, can coexist with a Reserve / load dump lead bank,
lets you turn the LFP into a portable powerpak to use on another boat, camper, off-grid cabin whatever.
e.g. Wired one up to drive a killer loud stereo setup in the back of my mate's 60's VW beetle camping in the bush, recharged in a couple hours driving.