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Shutdown on gridloss - Low Battery & High DC Ripple

No matter what I check, if I lose the grid for even a second the entire system shouts down and takes forever to reboot and I get a HighDC Ripple error(seems to be corrected after I fixed the settings the update changed) and Overload L1 and Overload L2 even if the load is well below the max of the Multisplus’s.

I am running 2 Multiplus 12/3000/120v in split phase with 900amp hour batteries with a discharge capacity of 400 amp for 3-5s 12v batteries, I have checked and rechecked every connection line length.

Update,

Found that a firmware update changed a bunch of my settings in my inverters, so once I corrected that it seems that the High DC Ripple error might be gone, however the system is still shutting down and I believe the inverters that are in split phase are not doing a pass through on each line which is causing the load draw is causing my inverters to over draw my batteries and causing my BMS to shut down. Why would they not be doing a pass through? My single inverter did the pass through and I would never see overload issues unless the grid was completely down and the inverter had to draw from the battery.

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nickdb answered ·

What's going on? Your batteries are most likely under spec.

Please provide more detail on your inverters and the exact model and spec of the batteries, configuration etc.

All the symptoms you describe relate to an underperforming set of batteries, something Victron can do nothing about.

Where systems are sized correctly these issues just don't appear.

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saintb6969 avatar image saintb6969 commented ·

I do not buy that one bit about the batteries, I have 3 300AMP Hour batteries with a max continuous discharge of 200amp and 2 Multiplus II 12/3000/120. The system worked perfect until I added the additional Multiplus and went to split phase, and yes all my wires are symmetrical, so again the blaming it on the batteries does not work for me. The system should never overload when the load is less than a 1K amps and each inverter is rated for at least 2400w continuous.

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nickdb avatar image nickdb ♦♦ saintb6969 commented ·

Those two inverters can pull well over 500A from those 12V batteries.

It has nothing to do with load (though that plays a part). Low frequency inverters will lean on the battery for all demand, if the grid does not shut down cleanly, and tends to brownout, that pull from the battery will happily drop the BMS.

Believing manufacturer specs (you haven't provided model or details for it) may also disappoint.

An overload warning/alarm should also not be interpreted literally, it can have different causes.

Many of these types of cases have been troubleshooted and resolved, it is always the battery.

You state this started when you added another multi? That further confirms it. Same with the ripple (unless you have bad wiring/connections).

If you want to dispute the advice that is your prerogative, then rather log a formal ticket at professional.victronenergy.com/support and see if that channel comes to a different conclusion.

We have helped enough people with the same symptoms before.


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seb71 avatar image seb71 saintb6969 commented ·

The system should never overload when the load is less than a 1K amps

1000A from 12V battery means 12000kW.

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