Victron. Want to hire an expert. Around SE.

The Victron Multiplus 12/3000 has an efficiency of 93%. Most LiFePO4 batteries spend their life around 13 volts, not 12 volts (but 12 volts is common to use in these calculations). That puts the maximum (continuous) amp draw at closer to 496 amps (6000 / .93 / 13). That's still quite high, but each inverter would be half that, so call it 250 amps. The manual calls for a 400 amp fuse to on the cable to the inverter.

The calculator linked below says that 250 amps @ 13 volts for 10' round trip could use 2/0 cable for only 1.53% voltage drop.

The Multiplus can accept two cables on each polarity. If the existing cable isn't enough, add a second one.

HRTKD said:

The Victron Multiplus 12/3000 has an efficiency of 93%.

Click to expand...

That is the maximum efficiency not the typical.

The inverters are connected to the lynx with 4/0 awg which is fine.
The problem is the trunk cables between the lynx and the batteries is 4/0 awg.

The most charitable I can manage is ...
3000VA ~= 2400 watts
2400 ac watts / .9 inverter efficiency / 12 volts low cutoff = 222.222222222 amps
222.222222222 amps * 2 inverters = 444.444444444 service amps
444.444444444 service amps / .8 fuse headroom = 555.555555556 fault amps.
550 amp class t fuses are hard to find so I would suggest an alternate topology.

Assuming the batteries are on the other side of the bulkhead I would have done something like this.
lynx_power_in.1<->lynx_power_in.2<->lynx_shunt<->lynx_distributor.

Each battery gets a 150 amp MRBF fuse at its positive terminal and is connected to a port pair on one or the other the power_in via 4 awg.
Both inverters get connected to their own port pair on the distributor with a 400 amp mega fuse.
The final two pairs are taken by the solar charge controller and the dc_distribution panel.
If there are more loads and/or charge sources I would add another distributor to the right hand side.

I have a similar dual multiplus setup to Barry only with 48V.

Due to space constraints, battery input is entering from the right side. That's not usual practice but is there a reason besides customary practice that battery input should always be on the left side?

CamoGreg said:

I have a similar dual multiplus setup to Barry only with 48V.

Due to space constraints, battery input is entering from the right side. That's not usual practice but is there a reason besides customary practice that battery input should always be on the left side?

Click to expand...

The lynx shunt is probably directional.
Confirmed on page 4 -- https://www.victronenergy.com/upload/documents/Lynx_Shunt_VE.Can/Lynx_Shunt_VE_Can_Manual-en.pdf

Guys dont know enough to help out here, but batteries are now on the same side as inverters, and lead cable from batteries is 12 to 18 inches long without checking.
But thanks for the review!
Appreciate all the responses; although most are greek to me again, you guys are great.
Barry