question

ondra avatar image
ondra asked

DC loads/DC system in ESS

Hello,

I have a 3-phase system 3x5kVA MPII, 1xMPPT, 2xFronius Symo, BMZ lion battery 48V with BMS, everything is controlled by Cerbo + ESS assistant. Everything has current FW, AC Coupled feed in excess - ON, DC Coupled feed in excess - OFF. Now I canceled home UPS APC (for home server, CCTV...) installed Phoenix inverter and SmartShunt. I turned it on in Settings - System - Has DC system ON. I set the SmartShunt as DC Loads. Unfortunately, I have two problems.

The first problem - the DC loads field does not appear on the display. It only appears immediately after a restart, or on the display that I'm not using.

Normal view ( No icon DC Power displayed ):

1657135112049.png

Display after restart Cerbo: (as soon as ESS assistant starts, the DC loads field disappears)

1657135112106.png

Another screen I don't use, here is the DC loas to see:

1657135112156.png

Would it be possible to modify the FW to show the DC load on the "primary" screen like here?

1657135112185.png

The second problem - if the battery is charged, CCL 0A. When I turn on the DC load, the battery discharges and micro-cycles (100% -> 97% -> 100%...). Unfortunately, the MPPT does not supply any power (to balance the draw from the battery), the Symo supplies power to the grid. Is this normal behavior? Shouldn't the MMPT regulator supply the same power as the Phoenix draws so that the battery is not constantly being discharged and charged? It can be seen in the pictures above.

Thank you for the responses, or for the advice.

Ondra

dc system
1657135112185.png (57.6 KiB)
1657135112049.png (289.0 KiB)
1657135112156.png (226.0 KiB)
1657135112106.png (265.9 KiB)
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1 Answer
janr-1 avatar image
janr-1 answered ·

Hi,

Did you find a solution in the mean time?

I have exactly the same problem with "DC-loads" (an external charger in my case). DC-Loads are visible directly after booting the GX, but they disappear once ESS has started.

My GX (MultiPlus 2 3000 GX) has firmware 2.89.

Greetings,

Jan

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