• Have you tried out dark mode?! Scroll to the bottom of any page to find a sun or moon icon to turn dark mode on or off!

diy solar

diy solar

Sanity check on Multiplus II 12/3000 2x120 Setup for RV

poqirax

New Member
Joined
Jul 2, 2025
Messages
38
Location
USA
I am getting my trailer soon and am going a bit overboard, but I want to have flexibility when it comes to power availability.

2x200 solar panels on top, 400 solar suitcase, maybe add more solar panels on top later, but that is how it comes stock.

Replacing the Go Power solar controller and the stock inverter right off the bat with a Multiplus II 12/3000 2x120.

3x 280 AH Wattcycle minis.


Where I am starting to be confused is that I know the Wattcycles need an additional fuse for overcurrent protection for each battery since theirs is lacking. I saw a 250W fuse is the suggestion, but I cannot find anything on how to add it into the wiring diagram.


I am basing this all off of a similar setup over on the victron forum here - https://community.victronenergy.com/t/rv-installation-with-multiplus-ii-new-installation/26039/23

The difference will be that I will not have a converter (I think?) and that I am not sure I will be using a Cerbo (yet, maybe later). I will also be doing all of this in a 30A trailer.

I am also kind of bringing this one into it too https://diysolarforum.com/threads/rv-wiring-plan-using-victron-multiplus-ii.98366/ by planning to add a 300A fuse to on the positive side.

I have never done any electrical work (but I have done wiring with ethernet and server room work) so I am definitely getting out of my depth, but I think this all makes sense? I plan to buy the specific cables I need premade cables from currentconnected due to that seeming to be the most dangerous spot to make a mistake.

I am open to any and all ideas, suggestions, and remarks!
 

Attachments

  • RV - Electric Wiring Diagram.jpg
    RV - Electric Wiring Diagram.jpg
    174.3 KB · Views: 26
if it was me:
equal length 2/0 cables jumping each battery together (+ to +, - to -) then take the positive post on one end of the string and the negative post from the opposite end of the string and run those to your inverter with a GOOD name brand (blue sea, victron etc) ANL or class T 300amp fuse. cheap car stereo ANL fuses commonly melt was used in applications like this...ask me how i know lol
 
if it was me:
equal length 2/0 cables jumping each battery together (+ to +, - to -) then take the positive post on one end of the string and the negative post from the opposite end of the string and run those to your inverter with a GOOD name brand (blue sea, victron etc) ANL or class T 300amp fuse. cheap car stereo ANL fuses commonly melt was used in applications like this...ask me how i know lol
I bought the mega fuse holder and the 300A https://www.currentconnected.com/pr...4v-48v-systems/?attribute_current-rating=300A by Littlefuse. This is what you means right?
 

diy solar

diy solar

diy solar
Back
Top