question

law avatar image
law asked

Battery size with AC & DC coupled system

Hi there!

I am thinking about a AC and DC coupled system.

- a 5kVa fronius inverter on ACout 1 (with 6 kwc PV)

- a 5kVa multiplus 2

- 9.6 kWh LFP pylontech batteries (4x us2000c)

- a mppt charge controler (with 3 kWc PV - dc coupled)

So my question is:

In cas of grid failure, is my battery size(9,6) big enough to deal with the 6 kWc PV coming from the 5 kVa Fronius Grid inverter combined with the 3kWc DC-coupled PV array? (Am thinking about the 1:1 rule)

Thanks a lot in advance

Lo


battery capacity
2 |3000

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1 Answer
Alexandra avatar image
Alexandra answered ·

@Law

The 1:1 applies moslty to ac pv and battery/system sizing. Is your ac pv being controlled controlled by the victron system?

The mppts will throttle with the Pylontec control of the system.

You just meet the minimum requirements for a 5kva victron and the ac coupling. So the system should be fine. But in all honesty get one more battery it will be a kinder setup for them when you are operating without grid support.

2 |3000

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