question

puigverd avatar image
puigverd asked

Blackouts in off grid installation. With grid inversors.

Good morning

We have problems with blackouts in a off grid installation. We have thisproblema in two systems and in both of them we have installed BYD LVS batteries.

This system it has a Victron Multiplus 10000/140, 4 BYD LVS batteries, a grid inversor Kostal Piko MP 5kw and a Victron color control.

With the batteries at 100% of SOC, after 2 hours aprox the system make a blackout. We don’t know the cause, we try go down the bulk voltatge at 55,4V because we have a hight voltatge warnings.

We have charging the AC current assistent and the PV iverter assistent. We attached the frecuencies configuration.

You know the cause that can cause this blackouts? We have the same problema with another installation, the differences is that the grid inversors is a Sunny boy 6.0 and also there are 6 batteries and a Victron MPPT 450/100.

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Also, attached the grafics where it can see the blackouts.

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1660731330422.png

1660731330446.png

Thanks!!!!

offgridBYD
1660731330375.png (8.3 KiB)
1660731330400.png (55.6 KiB)
1660731330422.png (29.8 KiB)
1660731330446.png (49.3 KiB)
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lifeingalicia avatar image lifeingalicia commented ·
No idea why you have 2 hybrids but I noticed the fail seems to be at SOC 100 this may indicate that the multio cant control the PIKO - Check that he pico actually can be regulated down at the given frequencies. It looks like BMS is shutting down.
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1 Answer
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @Puigverd,

This might be occurring because there is a cell or two that is a little imbalanced.

There are some instructions here in the BYD compatibility guide for how to reduce the DVCC target voltage to potentially reduce the overshoot. Try that and see if it resolves the issue.

12. High voltage warning or alarm shown on battery status

In the long run, the battery cells should rebalance and it should be possible to disable this again to enable a full charge.

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