Increasing input inverter voltage certainly would reduce the amps, so worth exploring. Even 100 amps is serious business, but much less than 500.
Someone who has experience with 12 volt and various current flows up to 150 amps. I would think you would also need to think through some failure modes and protect against them, ie limit current flow to any single battery to 30 amps, even at low voltage. You would only be able to run the 60 volt inverter off the series wired batteries, and never directly off the alternators. So each batt would be providing 20 amps at rated load, where at 12 volts, the alternators could supply the inverter directly and greatly reduce conversion losses. How long can lithium batteries last with a 20 amp discharge rate, before effecting the life? Just some thoughts.
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