The seeks in-rush current troubleshooting advice to determine if the multiplus 12/3000/120 inverter has failed or is failing.
In 2020, I installed the Victron multiplus 12/3000/120 along with 600 AH battleborn batteries in parallel. This system ran my Coleman Mach 10 with a micro soft start flawlessly until 2024 when I accidentally ran the microwave and the air conditioner startup at the same time. The multiplex went into overload and locked. The 400 amp fuse blew. I replaced it and was able to unlock the overload. Ever since then, the Victron multiplus frequently goes into overload when the Coleman starts. I install the new soft start but had no effect. I checked torque on all battery connections and wiring connections in the entire system. The lithium batteries will charge to the 14.6 volts.
I suspect that the multiplus circuitry has been damaged but I don’t know how to troubleshoot to prove that.
I assume They multiplus use capacitors for the inrush surge.
There is more probably damage to the switching FET’s in the multiplus, rather than the capacitors. Usually these fail short under overload, hence blowing the 400A fuse. Just replacing the fuses has likely burnt out either the device legs, or pcb tracks, this would be obvious in an internal examination - but that would be best left to experts. Probable best course would be complete replacement of the power switching block, as the stress can internally damage the other fet’s too.
Thank you! I didn’t even think about the switching FETs. I agree with you; they would be a probability cause.
Thanks