Configuration: Quattro 5k 120VAC/60Hz/12VDC 1420A Victron 12V batteries. Boat installation.
Issue : Varying transformer buzzing and varying AC voltage when using Breville Oven - nonlinear pulse PID power controlled. AC voltage fluctuates from 118 to 111vac after oven reaches temperature and regulated by its pulse control mode (400…700W after 1500 initial linear loads). Apparently from a back EMF like affect.I’ve found several posts regarding Victron low frequency transformer issues when using non-linear loads.
Current Quattro was repaired with latest control boards (caps) as a result of total failure last year failure (second Quattro in 3 years). The previous Quattro did not have an issue with the pulse controlled Breville oven.
Dual induction cooktop is not an issue nor any other loads (Watermaker, InstaPot, 120VAC Aircons, battery chargers, microwave…
Am I seeing this operation due to the new control boards capacitor changes or configuration? While not a loud buzz, the varying voltage is disconcerting. Is it safe to continue oven use or replace it? Perhaps a Panasonic microwave/oven combo?
UPDATE: So Breville BOV series has multiple heating elements, each independently controlled via triac switchers, which I assume are not synchronized. Reports indicate Breville BMO series “Combi Wave” does not induce the problem.