Hello everyone, I’m looking for input from the community and Victron engineers regarding a persistent oscillation issue we’ve been troubleshooting. System Overview Inverters: 2× Quattro 48/10000 units configured for split-phase (L1/L2) Battery: 6× EG4 48 V 100 Ah LiFePO₄ (LL-S, total ~30 kWh) …

Are you certain that the CTs are in the correct orientation? Are you certain that the CTs for L1 and L2 are not swapped relative to the Quattros? Are you certain that the ratio on the EM540 is set correctly for those CTs (30 for 150:5A)? Does the EM540 give correct L1/L2 wattage numbers with a kn…

All good questions. So the oscillations have been happening long before installing the EM540. It occurred just with using the Quattros to measure current usage. The only reason I got the 540 is the dealer/tech support said that Quattro couldn’t update fast enough so needed and external meter. Th…

[image] toddwhy: So the oscillations have been happening long before installing the EM540. It occurred just with using the Quattros to measure current usage. The only reason I got the 540 is the dealer/tech support said that Quattro couldn’t update fast enough so needed and external meter. The 5…

Here is a video that shows it with the EM540. The oscillations are the same with the EM540. Skip to the end of the video to see the oscillations. The dealer asked for video of the system. Also not I used the EV charger to put a bigger load on to the system. But this will happen even without the…

OK, scary video at the end! I’m currently at a loss to explain what you are seeing. It should be a straightforward ESS implementation. [image] toddwhy: The utility comes in to a meter. There is <100 feet run from the meter to a disconnect box. From the disconnect switch < 10 feet to the Quattr…

I haven’t a clue what the clicking is. The dealer wasn’t helpful and said that was “normal”. I did do deep dive into the low voltage warnings with the assistance of chatgpt. We built all kinds of red-node diagnostic collections. Here is the report from that. Victron VE.Bus “Low Battery” Warning …

[image] ricardocello: Nothing unusual about any of that. How far is it from the utility transformer on the pole (or from a green box on the ground) to the meter? 150 feet to one green box. or 500 feet to another green box. Not sure which one we are on, but would guess the closer one.

so was pretty sure this system was going to fail which it did. Function continued to degrade. Had to shutdown the system and bypass due to L1 inverter failure. Stuck relay throwing power into the grid Constant error showing low battery on L1 of the split phase system ABSOLUTELY NO RESPONSE OR H…

[image] toddwhy: c0619ab8cda2 Hi, looking at this tread, whats the grid code you selected and whats the grid current setting?

Looking at your system, You have a generator as power supply ? Why do you select “external control” as ESS mode?

Severe Power Oscillations on Dual Quattro 48/10000 ESS System — EM540 Grid Meter, Cerbo GX 3.66/3.70 - #16 by lxonline - DIY

Topic		Replies	Views	Activity
ESS recently stopped working with split phase system setup Q&A and troubleshooting split_phase , ess , domestic , professional , quattro	0	67	7 October 2024
ESS suddenly started oscillating after 2 years of stable operation DIY diy , ess , vrm , energy_meter	16	147	24 August 2026
Parallel ESS units sporadically go out of balance DIY diy , parallel , ess , quattro , cerbo_gx , split-phase	11	256	11 June 2025
ESS immediately shifts to 63 Hz and disconnects Huawei inverter when AC Input is present but rejecte Q&A and troubleshooting expert , quattro , split-phase	2	73	4 July 2026
Loud humming noise and voltage fluctuations DIY diy , ess , vrm , multiplus_2_gx , multiplus-ii	30	878	14 November 2025

ESS recently stopped working with split phase system setup

Q&A and troubleshooting

split_phase , ess , domestic , professional , quattro

0

67

7 October 2024

ESS suddenly started oscillating after 2 years of stable operation

DIY

diy , ess , vrm , energy_meter

16

147

24 August 2026

Parallel ESS units sporadically go out of balance

DIY

diy , parallel , ess , quattro , cerbo_gx , split-phase

11

256

11 June 2025

ESS immediately shifts to 63 Hz and disconnects Huawei inverter when AC Input is present but rejecte

Q&A and troubleshooting

expert , quattro , split-phase

2

73

4 July 2026

Loud humming noise and voltage fluctuations

DIY

diy , ess , vrm , multiplus_2_gx , multiplus-ii

30

878

14 November 2025

Severe Power Oscillations on Dual Quattro 48/10000 ESS System — EM540 Grid Meter, Cerbo GX 3.66/3.70

Related topics