I'm adding 120v to my yacht (which is already set up for 230v). For battery charging purposes, is it possible to connect a MultiPlus-II 2X to a 230v generator so that I can make use of the extra 70 amp charging capacity?
asked
MultiPlus-II 2X input
The 120x2 models of Multi and Quattro are a single 120 volt inverter internally. The charger only takes power from the first leg. The second leg only feeds through to the output. When inverting, both L1 and L2 outputs are fed from the inverter and are IN PHASE with each other (0 volts between L1 and L2).
A generator connected only between L1 and L2 inputs to a 120x2 model won't work. There needs to be a neutral connection also (L1-N-L2) with L1 and L2 out of phase.
Autotransformers can step up/down voltages but do not provide isolation so can be problematic when trying to make 120-0-120 from 230-0. An ISOLATION transformer is more flexible since the input and output are on separate windings. While Victron doesn't make one, you should be able to find an isolation transformer with multiple taps so you can make 230 volts from 120-0-120 (split phase) or 120-0 (single phase) inputs. You might also find one that would allow you to step up 208 (two legs of three phase Y-connected 120 volt service) to 230 volts.
From the datasheet:
Splitphase:180-280VAC 45–65Hz
Singlephase:90-140VAC 45–65Hz
