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Vyacheslav Denysenko avatar image
Vyacheslav Denysenko asked

3phase ESS operation stability

Hello,

Can someone shed a light on how would behave/respond the 3phase ESS system in case if one of the grid phases fails.

Thanks in advance,

Vyacheslav

ESS
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2 Answers
marekp avatar image
marekp answered ·

@Vyacheslav Denysenko

System will switch to inverting on all phases.

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Vyacheslav Denysenko avatar image Vyacheslav Denysenko commented ·
Thanks, that's what I expected. I believe it makes sense to set the system somehow different than ESS. I expect the phases failures will happen quite often.
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marekp avatar image marekp Vyacheslav Denysenko commented ·
@Vyacheslav Denysenko

If you want your system to react to missing grid on phase by phase basis, You can set each phase as a separate 1-phase system. You will not be able to use a 3-phase equipment but all your 1-phase equipment would work.

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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

It doesn't matter if you use ESS or not.
If you setup 3 MultiPlus (or Quattro) to run together as 3-phase system, they always switch to inverter mode if one of the phases fails.

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Vyacheslav Denysenko avatar image Vyacheslav Denysenko commented ·

Thanks, Matthias, I can explain why I was confused a bit. If you open a recent Victron's blog page https://www.victronenergy.com/blog/2021/12/17/electric-vehicle-charging-that-comes-to-you/ on the GX Touch Screen you can see the only one phase available as power source and three phases are operating, on top of that it is in Power-Assist mode. That's definitely not an ESS setup, although operating as a 3phase system.

Thanks again,

Vyacheslav

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ Vyacheslav Denysenko commented ·
With the VE.bus system configurator you can setup a 3-phase system with only one input.

In such system you should also be able to use a different input on each MultiPlus but if I'm correct it will only use one input at a time. You can't connect a 3-phase grid to the input and use all three phases together. But I'm not 100% sure about that.

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