Fronius vs (ex)ABB PV inverters response times - Energy Talk

No. Not even close.

Goto ABB to know more.

I don’t know which is faster. But I know the Fronius is very fast.

Fimer SPA

Depends on PV-inverter. With Fronius, after two minutes of no comms, it goes back to full power. If I read sunspec correctly, this is what it is supposed to do:

Each of the immediate control functions, except connect/disconnect, has an
associated enable (Ena) register. Each time a control value is changed, the
associated enable register must be written with the ENABLED value (1). If a
reversion timer is set for a given control, the associated enable register
must be cleared by the device when the timer expires.

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Some of the internal solutions by manufacturers, eg a Fronius with its own smart meter or an SMA with a home manager, will stop making power if it loses contact with its own meter.

Edit: The two minutes isn’t Fronius specific. The protocol allows you to set the timeout. Every time you write to the PV-inverter, you tell it 1) this is the power limit, 2) it is valid for 120 seconds, 3) the limiter is ON. According to that blurb I quoted above, you must set the limiter ON every time you write a limit. That means you write 3 16-bit values every time, the limit, the timeout, and the enable flag. Well technically you write 5 values… there is also a ramp rate and a time window… but these are optional. A PV-inverter doesn’t have to support them. It need only support the limit and enable fields… if it supports model 123 at all.

My interpretation of what you are saying here is that there is no advantage in an off-grid situation versus any PV Inverter with frequency-shifting. That frequency-shifting is probably the mechanism that will be the most responsive anyway.

However, there may be another distinction, not curtailing power, but demanding curtailed power back again.
I’ll explain:
With frequency-shifting, the Victron will go up to 53Hz and switch the PV inverter off. The Victron then is locked at 53Hz until certain conditions are met. One is that the battery voltage drops. This can mean there is a fairly significant drop in SOC before the PV inverter joins the party again.
So, my question is if the frequency-shifting has locked the PV inverter out, is the ethernet control mechanism capable of bypassing these conditions and resetting the 53Hz thus bringing the PV inverter back earlier?

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