After completing a few offgrid installations with victron systems and having converted a vehicle to fully electric in the past, i was thinking through the possibly of building another EV using victron components. 3 x 48v systems in series gives 144v and with a 400a discharge limit (200a cont.) via 6 x series 24v 200ah victron batteries - this corresponds to about 57kw peak and 30kw continuous which is within the acceptable output for a small-medium EV.
since victron equipment only works with up to 48v nominal systems, 2 options could exist to use the multiplus & associated components;
1. parallel the 3 x 48v strings with 350A anderson plugs before charging with a single multiplus
2. or have 3 x 48V multiplus running independently but with the connection to shore power paralleled and 240VAC outputs paralleled?
option 1 requires more steps to charge but only requires 1 large capacity multiplus unit
option 2 however may be subject to ground loops since multiplus 1 would see 0V&48V, multiplus 2 - 48V & 96V, multiplus 3 - 96V & 144v. another post on here suggests the multiplus are infact isolation transformers however i can see a few scenarios where where a ground loop could occur (ie when EN relay reverts to the grid). i also assume multiplus outputs couldnt be paralleled as they are designed to do.
i would be interested to hear from a victron engineer on how this could work ? having a dual-use battery pack could make the investment more justifiable.
look forward to any relevant comments!
