I'm adding a Relion RB300 battery to my electrical system (got it very cheap), and want to use it as a solar "header tank" of sorts. The plan is to charge the lithium battery from solar only, and connect the lithium to the AGM bank with an Orion 12/12-30 isolated charger. All boat loads are connected to the AGM house bank. The solar panels charge the lithium whenever there's enough sun, and the lithium in turn tops off the AGM, probably keeping at or near float all the time.
Question is, is the Orion 12/12-30 isolated the right tool for the job?