I have a boat with an AGM start battery and a Lithium house battery. When the engine is running, a 35 amp alternator charges the AGM, which then charges the Lithium via the DC/DC/12/12/18 charger.
I am considering to buy the Blue Smart Battery Charger 25 amp to charge the AGM while on shore power. With the DC/DC/12/12/18 already connected, will the Lithium bank be charged automatically when the Smart Battery Charger is charging the AGM? Will this setup work well? Any detrimental effects on the AGM by being a "pass-through"? I see in the manual it says that
"A load can be applied to the battery while charging, as long as the current draw is much lower than the rated output of the battery charger. Reconditioning is not possible when a load is connected to the battery."
Thank you for your help.