Fuses and cables value?

[Courage2000]

Hello!
I have a 25kW PV system and a Fronius Symo 20-3-m (3 Phase)
I want to buy the parts for a Victron system to work with Fronius.

I’ll make 3 batteries, each 16kWh, 48V, 16x cells 314Ah 3.2V

I know I need:

• 3X Victron MultiPlus II 8000VA
• LYnx Power IN, Shunt and Distributor

Questions:

• what cable/cables size do I use to link each battery to Lynx Power IN and what Mega fuse value (3x)? (1.5m cable length)
• What fuse type and value do I use in Lynx Shunt ?
• What cable/cables size do I use from Lynx Distributor to each Multiplus II 8000VA inverter (1.5m cable length) and what fuse value (3x) do I use in the Lynx Distributor ?

The Mega Fuses for 48V are incredibly hard to find and expensive.

Thank you

[pwfarnell]

What fuse capacity or wiring size or bolt torque should I use for the DC connection to my Victron Energy Product

Often the wire size is dependent not only on the rating of the device, but also the distance between the device and the batteries as voltage drop is the limiting factor. Devices such as inverters also have to deal with ripple current due to the cyclic nature of the ac loads being supported by the inverter. Both of these may require that a larger cable size or fuse rating is required compared to that expected based solely on the simple current rating of the device (Amps = Watts/Volts) and the pub…

[Courage2000]

The distance is minimal, like max 1.5m

[Daza]

You have to include both neg and pos. So the flow pos to neg both cables combined is the total length of from the start of the pos to the end of it is 1.5m you include the start and end of the neg too that is your total length. Hope that makes sense

[Courage2000]

Yes.
I’ll have the batteries, on the ground, on top will be the Lynx System and the Multiplus.
It cannot get any shorter
So less than 5m the total lenght of the circuit between the battery and Inverters.