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My system is off-grid and has a Quattro 48/8000 with a FRONIUS PRIMO 3.0 on AC out, an MPPT 150/70 and a CCGX .
When battery is in float (55V) and the Fronius (on AC OUT) is regulated be the frequency (above 50.2Hz) the AC loads readings on the CCGX go crazy! Up and down by hundreds and even thousand Watts.
As soon as the frequency drops to 50 all is back to normal.
Any ideas?
you wrote " is regulated be the frequency (above 50.2V) "
do you mean 50.2 Hz maybe ?
I seems to me that the fronius output value is much less actuated on screen than the load is. What is the item that provides the load reading ? shunt from a bms ? Or the ccgx calculates it from output quattro data + output primo data ? How does ccgx obtain primo data ? data wire ?
I think this is due to the slow update frequency of the PV inverters power measurement.
AC loads are calculated as the difference between Victron output and PV input power.
Thank you for the reply. I think that the update frequency has nothing to do with it for the following reasons :
1) It would be still going on when the frequency returns to 50HZ but all is ok after that.
2) As you can see on the video, the PV power is moving from 1600-1900 W but he AC load is jumping from 700 to 2400!!! During this video the real Ac loads (measured by an energy meter in the house) were steady around 1600W. So it makes no scenece.
Please contact me if you need to get in my system and check for your self. Thank you
I'm sure the update frequency is the cause.
load: 1600W
PV production as indicated by PV inverter 800W higher than really made: AC loads displayed = 1600+ 800 = 2400W
and the other way round.
so when the PV production changes this happens, when production is stable there is no difference.
Thank you for getting back.
If I install a ET112 meter on the PV inverter Will things get better? Or would a CErbo GX be better than my CCGX because of the quicker processor?
What Firmware do you have in your CCGX?
If you have a version prior to 2.54 please upgrade.
What you seem to experience is a well known bug in old VenusOS versions - which I'm pretty sure Victron staff also knows all too well. ;-)
