The AGM batteries in my boat are finally ready for a replace. I have a really simple 12V electrical system. A typical high load is <15A (200W) but a more typical load is <5A. The alternator on my motor is 50A output. I’d like to get a new 200Ah LFP Smart Battery and a SmartBMS 12/100. I already have a BMV-712 for monitoring the banks. Do see anything I’m missing if I just add the battery and BMS?
The key point is what voltage does your alternator get to now. The lithium batteries get to 14.2V to complete absorption, there will be some voltage drop in the BMS so you ideally need your alternator to get to 14.4V. Use oversize cables to keep the voltage drop low. You may need to limit the alternator to 30 to 40A to avoid it overheating. If you do not have a large inverter tjen you should be OK with a basic scheme. Look on the Victron product page for the BMS, under downloads you can find the manual and example wiring schematics to get ideas for wiring your system.