EM530 Issues after installation (Strange Voltage, High Voltage (DC) Alarm, PV Inverter Position)

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Ricardo Chavarria asked May 23, '24

EM530 Issues after installation (Strange Voltage, High Voltage (DC) Alarm, PV Inverter Position)

Hi Everyone.

I've detailed my initial system diagram here. My system now includes an EM530, connected using RS485.

ESS set as Grid Metering: Inverter/Charger

I'm noticing three distinct issues.

My PV Inverter won't show if I set it as Position: AC Input 1, Phase: Split Phase (L1+L2) (which is how I've got it setup physically).
Yesterday, I setup ESS to have Grid Metering: External Meter. When the PV Inverter started producing, there was an alarm of high DC Voltage, and the whole system shut down. I had to restart everything. Needless to say, I reverted the settings to have Grid Metering: Inverter/Charger.
The Voltages reported in one of the screens of the EM530 is absurdly wrong: L1-L2: ~160V, L1-N: ~86V.

Voltages are incorrect Voltages are correct

If anyone can help figure this out, I'd appreciate it. The reason I got a Grid Meter was to have my PV inverter show up in the right spot and to be able to really measure our consumption.

Thanks,

- Ricardo

ESS split phase grid meter

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Ricardo Chavarria answered · May 28 at 03:21 AM

Answer to my first question.

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Modifications Space

Node Red Space

Answer 1 · 2024-05-24T12:20:12Z

rickc answered · May 24 at 12:20 PM

Weird voltages: The victron software keeps putting the EM530 into 3phase mode.

You can manually put the EM530 into 2p mode with the buttons, and then recheck the display that looked weird. Every time the cerbo reconnects, it will put it back to 3p mode, however.

As for the High DC voltage, that sounds like a different issue.

Are you sure the CTs are oriented correctly?

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Ricardo Chavarria commented · May 24 at 03:52 PM

Weird Voltages: I did notice that my meter was set to 3P...so freaking annoying!! Is there a fix for this? I changed it to 2P, and of course it worked, but it was set back to 3P soon after...can anyone from Victron help here? (@Guy Stewart (Victron Community Manager), @mvader (Victron Energy), @Thierry Cortassa (Victron Energy Staff))?

I tried setting ESS back to Grid Metering: External Meter, and of course as soon as the PV inverter started producing, the same issue happened, the whole system shut down with a High DC Voltage Alarm. I even tried adding a DV Voltage limit in the DVCC menu, to no avail.

My CTs are oriented correctly, just double checked, everything looks good.

About Fronius PV Inverter not being able to be seen when set to Split Phase (L1+L2)...I think this is because it's using solarweb API instead of sunspec API...can anyone confirm?

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rickc Ricardo Chavarria commented · May 24 at 07:05 PM

The 3p vs 2p split-phase thing on the carlo gavazzi meters (as far as i can tell) is an annoying display glitch, and should not affect correct operation as a meter. I’ve decoded the messages to and from the EM530, and can see what information is being queried to verify. When in 2p mode, the cerbo gx knows not to display any L3 power levels which is nice.

For your other problem, I assume the Fronius is on the output of the multilpus. Are your batteries at 100% when the DC High Voltage warning occurs?

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Ricardo Chavarria rickc commented · May 25 at 03:31 PM

Actually the Fronius is on the AC Input 1 side of the MultiPlus. Here's a diagram from VRM when I'm able to set it to Grid Metering: External Meter - at night when there's no PV production.

I've been doing some reading and apparently there's an issue with ESS, where I need to manually control it from NodeRED so it doesn't insert extra voltage above limit into the battery. For some reason, it's not respecting the BMS limits.

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