From ten years of running big AGM , diesel genset and inverter on a 47’ loa boat, i was profoundly disappointed with AGM performance and longevity Lifeline cost me a bunch of $$$$, Eventually i went back to lead acid low tech reliable with some noted constraints. absolutely nail down the system design and warranty. If it were me, i would put the genset in a hush house with auto start / off.
Best to you !
Jim