Hi
We commissioned an off-grid system yesterday consisting of Pylontech lithium batteries, a Quattro 8000 a 250/60 MPPT with 8 x 330watt panels and a Fronius Primo 3 with 12 x 330watt panels.
The Fronius is set to Micro Grid 50Hz and the Quattro has been configured as per the default settings to control it via frequency shift.
In order to check everything we ran a "stress test" on the system by turning on loads peaking at 7,000watts and averaging 5,000watts. At the start of the test the batteries were at 96% SoC and at the end of the test they had dropped to 89% - whilst this test was underway the 250/60 was providing around 2.000watts of energy but the Fronius was not working at all as the frequency provided by the Quattro was stuck at 53Hz - it could have been providing 2,500 watts or thereabouts which would have covered most of the loads without discharging the batteries.
This is the Frequency from the VRM for that period
Does anyone have a reason why this would be the case?
More details from the VRM
Thank you
PS. This morning the Fronius is working and providing power to recharge the batteries.
