The manual recommends 70mm squared cable. But would a 4/0 cable fit with an outside diameter of .710" with an M8 lug? The cable I'm looking at using is:
Run 2x 50mm2 as there is two pairs or incomer bolts for DC input, as 120mm2 will be hard to bend etc in tght spaces etc.
Thanks, that makes sense with the two terminals.
But it also complicates my circuit breaker connection if I need to wire two positive wires into the 1P breaker rather than one.
I suppose I could have two wires from the MP go into a small bus bar, then use a 4/0 wire from the bus bar into the 1P circuit breaker and then on to the Lynx (assuming the Lynx distributor can handle a 4/0) cable.
I don't understand what "cross sectional" numbers are. When trying to fit a wire into a hole or onto a terminal, isn't wire diameter including the insulation the only number that matters?
No, get a installer to do it for you they know what is required.
We use 4/0 for 48/8000
Those numbers (at least for 4/0) correspond with the table here. Although it has the 2/0 size as 3/0.
If you think the 4/0 number is off, perhaps the difference is insulation? I'm guessing his/her numbers are for copper only and don't include insulation.
https://www.electricalworld.com/en/AWG-to-MM-Cable-Conversion-Guide-and-Calculator/cc-51.aspx
Thank you. I think this guy installed 4/0 on his MP2: https://youtu.be/kBYgkN1_r8Y?t=116
I'm not sure what kind of lug he's using, it seems like it has a 90 degree bend in it.
I wonder if somebody has made an adapter that fits over both Victron terminals and has one large terminal on top, like a mini-bus bar? That might make it easier to put a larger cable in there without having to double your lugs with two smaller wires, and double your opportunity to get cable lengths mismatched, and complicate hooking into circuit breakers and such downstream.
But this guy seems like he used a 4/0 without any issue. What kind of lug did you use?
I won't argue with the other experts here, but I will say that I've installed and used several 3000VA 120/12 Multipluses (both the older, and the new 120x2 MPII) using 4/0 and the cable gets only slightly warm when running at max capacity for hours on end.
4/0 seems to be the way most installers in the US are doing it. it certainly has the ampacity.
