Fuse and wiring size for Multiplus 2000

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4sarah asked Jul 15, '23

Fuse and wiring size for Multiplus 2000

I'd really appreciate some advice - completely new to this so apologies if silly question.

I see Victron recommend 70 mm2 cable and a 300amp meg fuse to the Multiplus 12|2000.

I have a 230amp lithium battery (obviously less than 300...)

should I go for a smaller fuse in this case? and what wire size? if length of cable relevant, definitely <5m, probable around 1m

wiring fuses multiple inverters

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

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Answer 1 · 2023-07-15T15:48:50Z

Alexandra answered · Jul 15, 2023 at 03:48 PM

@4sarah

Keep the wiring size large. 12v systems are notorious for volt drop under load causing other issues. I would get even bigger of it fits.

2000 ÷ 12 is 166A. So your fusing needs to be larger than that or you will have to be carrying spares all the time because of seemingly random blowing.

What nominal discharge amps does the battery bms allow? AH is not the way to look at lithium suitableness for an inverter.

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2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

4sarah commented · Jul 15, 2023 at 03:59 PM

thanks for getting back to me so quickly

max continuous discharge is 200a

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Alexandra ♦ 4sarah commented · Jul 15, 2023 at 04:36 PM

Nice bms there then. You should be all set.

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4sarah Alexandra ♦ commented · Jul 15, 2023 at 04:52 PM

so I should be fine using 70mm cable and 300 amp mega fuse between multiplus 12|2000 and battery?

and I guess use 70mm from battery to busbars and ground, with a slightly smaller fuse here?

thanks very much for your inout - lots to get my head around!

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