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mfred68 avatar image
mfred68 asked

2x 50mm battery cables

I have a Multiplus 2, 48/10000 and according to the hand book that came with it, I should use 2x 50mm battery cables if under 5m. Thats two positive and two negative in parallel.

The multiplus does have two terminals on each + and - (4 in total) so connecting two red and two black wires is easy, but i'm a bit stuck as to how to connect the other ends of the cables.

I need to add an inline mega fuse to the positive wires but the fuse holder only has one terminal, same goes for the isolation switch, it only has 1 terminal.

So do i stack the two wires onto the single terminals, or do i need another busbar after the fuse and switch?

Or to simplify things should i fit a 70mm or 95mm single cable instead? The maximum length would be 1m per cable. (i'm still in planning stage, so nothing is fitted yet)

Multiplus-II
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max-payne avatar image
max-payne answered ·

Victron has a seperate guide about cabling.
https://www.victronenergy.com/upload/documents/The_Wiring_Unlimited_book/43562-Wiring_Unlimited-pdf-en.pdf

It entirely depends on what you do with your system. I use 16mm2 for a 5000 with 50a max and it works fine with a low vdrop since the cable runs are short.

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nickdb avatar image nickdb ♦♦ commented ·
The requirements for a 5k state recommended fusing is 200A and 70mm cables for short runs.

50A is hopelessly underspec for that inverter.

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daza avatar image
daza answered ·

@mfred68 Me personally I would use fuse breaker https://www.bimblesolar.com/extras/dc-fuse-disconnect?product_id=1898 victron says it’s 400amps assuming it’s 200amps per cable https://www.victronenergy.com/upload/documents/MultiPlus-II_230V/32424-MultiPlus-II___Quattro-II_120V-230V-pdf-en.pdf then bus bar 1000amp plus more amps it can take the better then maybe connected to Lynx power or distribution for battery connections just a thought all the best with system design mate

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max-payne avatar image max-payne commented ·

This one:
https://www.victronenergy.com/dc-distribution-systems/lynx-power-in

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