question

karlheinzhaller avatar image
karlheinzhaller asked

What are the correct settings for an Off-Grid Victron Quattro 24/8000 & SMA SB5000TL-21 System

Can somebody advise the correct settings in the PV Inverter Support Assistant to control the output of the SB5000. The SB5000 ramps down to early and the batteries do not get enough charge.


Batteries: GEL 2x12V 250Ah in series and 3 sets in parallel.


SB5000TL-21 setting is Islanding 50Hz


Quattro Charger setting is: Absorption 28.8V; Float 27.6V. Max Charge amp are 75A.


The Quattro PV Inverter support setup is in default setting right now:


State

50Hz

.

Start

50.2

Hz

Minimum

52.7

Hz

Disconnect

53.0

Hz


I contacted SMA. Their response is as follows:

Our island mode 50Hz is default to operate in between 51-52Hz for P(f): 100%-0%.

In this case you may want to change the frequency settings on the Victron to match our island mode frequency range.

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1 Answer
philmay avatar image
philmay answered ·

Hi , sorry but I can't help you with an answer but I am getting the opposite.

I have a Multiplus AC coupled to an SB5000TL-20 that is going over voltage and locking the Multiplus at 52Hz. This then shuts down the SB and next thing you know the batteries have discharged.

I am going to drop the absorb voltage by a couple of volts and see what happens.

I have been told/read by a few people that this will get rid of chargeing spikes that are causing the problem

Did you ever get to the bottom of it? You might have to increase your absorb voltage perhaps?

Cheers



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