Just a couple more things to consider, the reason the battery is mounted on a wall is for cooling, lithium batteries can get very hot. Lithium batteries need cooling airflow with no possibility of sea water getting on them. Mounting them low in a hull or a confined area can be a bad idea.

400 volts DC is a little scary to me, arc welding time, if you aren't careful. One of the failure modes of Lithium cells is shorting which can make life interesting on a sailboat.

Two battery systems are probably necessary for redundancy, that can be good or bad : ) 

I am pretty sure Tesla has a pretty good monitoring system for the above concerns, their cars aren't going up in flames after a car wreck and monitoring the batteries so that they don't get overcharged or too drained (that will kill them).

I am going to take a long look at the battery when they actually start making them.  It seems they include charging circuitry, eliminating the need for a charging system.  The high voltage makes them more efficient at transmitting power and needing smaller wires.  Still needs an inverter though.

What makes lithium batteries superior to lead acid batteries is their steady voltage and huge discharge range, typically 70% of the rated capacity, vs 30% for lead acid. That makes them much lighter per useable amp.

This is one of the usual happy hour subjects, we call it the batteries anonymous meeting. An amp meter/totalizer is an absolute must too.  Snagging a used battery from a wrecked Tesla is probably the most economical option.

Talador

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