Output wire sizing Multiplus II

[tonyg]

Hi,

I'm trying to figure out the wire size for AC-out 1 from my Multiplus II 8000.
Do I go by the datasheet continuous power value i.e.: 6400w => approx 30 A at 230V, or do I go by the manual that says 45A for output? Please see the screenshots attached.

The consumer unit is 15m away from the inverter.


Thank you

 

[sunshine_eggo]

Size by the transfer switch, 100A for your unit. It will accept and pass through 100A, so you use 100A.

If you plan to use Power Assist for weak AC, 100A + 35A output = 135A output.

If you do not plan to feed it 100A, size accordingly.

If you do not plan to use PowerAssist, size accordingly.

You do not size wires/fuses for peak power since peak power is ~20 seconds max.

IIRC, the 8000VA rating is good for up to 30 minutes, so size for that.

8000VA ~ 8000W. 8000W/230V = 35A

If Victron says to size for 45A instead of the above 35A, I wouldn't argue with them.

 

[HRTKD]

My Multiplus 12/3000 (120v, not 240v) has a max AC input of 50 amps. My generator produces a maximum of 45 amps and that's probably a little high. I've stressed it out in the past and the breakers always trip before I can get to 45 amps, so I'm expecting no more than 40 amps from it.

My trailer has a 30 amp system. I could connect to a 50 amp pedestal connection with a dogbone but A) I'm rarely in a campground and B) I stick with the 30 amp pedestal connection. Consequently, I came up with a max AC output of 53 amps. That's 40 amps from the generator and 13 amps from Power Assist. I used 6 AWG cable into and out of the Multiplus.

I haven't tripped any breakers in the trailer's main distribution panel yet. The main breaker is 30 amp. That leads me to believe that I haven't come close to producing more than 30 amps out of my Multiplus. Or, the breaker could be bad.