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I have three 48/5000/70 Multiplus II units configured in parallel mode for a on-grid house system.
If I enable ESS, or if I enable the inbuilt Charger, it emits a very heavy HUMM noise. The lights in the house dim and pulse to the noise. I have read multiple posts about noises and I think some noise is normal, but this noise shakes the house. It happens regardless of load.
Any ideas on how to debug or resolve?
Sounds like there is something wrong with the wiring, did you follow all the steps in the manual:
https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems
parallel systems are complex and good wiring (equal lenghts and right cross section) is mandatory to get it work right
Thanks. I believe its all perfectly matched with same torque values on all posts etc.
Interestingly it does not occur when I use the Charge Current Control assistant.
