Overload blues…
Hoping someone can chime in with some advice: we have a power backup installation at a retail store selling frozen meals - a bunch of high-end freezers, lights, Point of Sale.
2 x 5kVA Victron MPII on a Freedom Won 20/16. Massive overload spike each time load shedding starts, inverters trip, sometimes the system auto-restarts, sometimes not. If we do a grid fail simulation by tripping mains on-site no issue whatsoever. Overloads reported on VRM and verified with a clamp meter.
Tried installing older firmware (459), swapped MPII's for a 10kVA Quattro, no change. Looks like this isn’t an inverter issue.
Any thoughts as to what condition would be fundamentally different when the munic load sheds vs when we trip mains manually?
Backup loads are on a single phase of a 3-phase supply. Load is typically 2 - 3 kW under normal running conditions.
Load spikes to 50-60A (AC) at the transition of Mains Failure to Inverter.