Energy Unlimited by Victron

10.7.2. A better solution in terms of weight and space required is a 6 kW generator with PowerAssist , or a 5 kW DC generator

Implementing PowerAssist with a 6 kW AC generator would in our example of the fully featured yacht require 2 Multi’s. Using the DC concept when on shore power would require 3 Multi’s. With PowerAssist most of the AC power would be supplied directly by the AC generator and the average DC charge current needed would not exceed 75 A for a 4 hour generator period.

If most of the time the daily requirement is much less than 14 kWh, one could opt for a 1 cylinder 3.5 kW generator.

Warning: Especially low power AC gensets fitted with a synchronous generator tend to overheat when used at full load: derating of up to 30 % is often necessary to prevent catastrophic failure! Nearly all small gensets are fitted with a synchronous generator. The notable exception is Fischer Panda, who uses asynchronous generators.