question

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Stuart asked

Fronius being throttled at 08h30

I have a 90kVA system with 6 x Quattro 15kVA in three-phase - two inverters on each phase

I also have 4 x Fronius ECO27kW units populated with 20kW solar each

Additionally, I have 2 x 250/100A Victron MPPT units (each with 6kWp solar)

This is coupled to a Freedom Won battery (300kWh) with a BMS for control.

All components are linked to the CerboGX

DVCC is turned on without limiting voltage or charge to the batteries

The inverters are loaded with the PV assistant with PV inverters set at 108kWp (ie 4x 27kW ECO) and installed solar set at 80kWp (20kWp per Fronius)

At 08h30 in the morning when producing only 43kW and the batteries at 39% and at 53.20V (battery voltage) and DC voltage read ON the Quattro units is 53.52V, I see the output frequency has shifted to 51.9Hz and the Fronius production is being throttled. At the time, the CCL (Charge current limit on the battery remains at 1500A) and the charge voltage limit reamins at 55.8V

So, what is causing this throttling via the frequency shifting. I see nothing that would cause this. The battery is still happy receiving 1500A and needs 55.8V, so the system is far from those values

Thanks

Froniuscharge current limitfrequency
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2 Answers
Stuart avatar image
Stuart answered ·

@Victron

I would enjoy to hear your take on this.


I'm happy to add more info. This is an off grid system with a generator on AC 1 IN and no input in AC2.

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Stuart avatar image
Stuart answered ·

Hi


Here is a screenshot of the system. It was working well, till just about 10h00, when the throttling began... I just cannot see what is causing this limiting.


a.jpg


a.jpg (70.2 KiB)
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