Wiring 40/10000 multiplus - two fuses for 2 x 50mm battery cables?

Q&A and troubleshooting
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1

Am about to upgrade from 48/5000 multiplus to 48/10000 multiplus. My current set up is 15kw lithium battery with 5kva multiplus going into lynx distributor using the recommended 200a fuse. i then have a battery isolator switch coming off the positive of the lynx distributor. Just before battery i have a t class fuse on the positive (recommended for lithium batteries).

For the 10kva multi victron states 2 x 50mm2 cables for runs of less than 5m and 400a fuse. So can i just wire the 2 x positive and 2 x negative from the multi to the lynx distributor and have a 200a fuse on each positive? and at the battery can i then have 2 t-class fuses (was thinking 225a each) on each positive, again halving the fuse rating due to twin cables? I have twin positive and negative connections on my battery and so like the idea of using them both so as to increase the contact surface area for the battery cables

The alternative is using busbars to bring it to a single 120mm2 cable where i need to fuse (and use a single fuse) and back out again to twin cables - more complexity so would like to avoid

can’t find much out there on using two fuses and halving the rating - hence the post. Thanks

2

Generally one would not use one fuse in each cable, but to connect both cables to one terminal of the full size fuse. This does not mean that one cannot do this, however one must be careful that the current balance of the 2 cables - identical lengths and terminations.

3

Thanks, yes i figured to keep everything exact if using two fuses. It might be just me but i think victron could maybe do a better job of explaining how they would suggest wiring their recommended 400a fuse on their recommended 2 x 50mm cables - a bit confusing! Thanks for the info