We are running a 48/15000 Quattro along with 4 x Fogstar Rack Mount 48v batteries. This is purely a grid supported system with no solar. The application is wanting to be used as a backup should there be grid loss.
Setup is in a garden centre with a café. Settings have been set as Keep Batteries charged, was previously in Optimized with Battery Life but had same issue. Minimum SOC is set to 75%. Grid Set Point is set to 50w.
The system charges up overnight but as soon as large loads are put on, the system seems to prioritise Batteries rather than grid supply. The batteries are then discharged within 2-3hours as
I believe all settings are correct but looking to see if anyone has any ideas as too why…..
Check your AC Input Current Limit and Peak-Shaving settings.
If the system is “believing” the current loads are exhausting your grid limits, it’ll try to prevent breaker tripping / fuse blowing by using battery to drive the loads.
Looking into this a bit more it appears as if the peak shaving kicks in too early and then continues to discharge. today the system has been discharged to 5% it then starts to charge until it gets to around 9.5% and then discharges again.
At the start of the day you could see the ESS setting were being flagged but once the battery had discharged to around 60% the warning messages left.
As stated in previous reply. AC Current Limit is set to 80a and Peak Shaving is ‘on’ .
“Peakshaving above minsoc only” is generally sufficent when you don’t have a weak grid.
You can also enable the limit buttons and manually provide a high value - would at least make the setting applied explicit.
As for the charge settings, i’m a bit confused: Fogstar claims this to be a 16s battery, but outlines it to be 51.2V nominal voltage (which is 15s - 15*3.2) A 16s would typically be 54.4V nominal voltage.
Do you have the BMS connected with your GX? If so, then try to enable DVCC and make sure the controlling BMS is correctly set. Then the Battery will tell the system what voltage / currents to use.
Yet wrong settings “there” shouldn’t cause what you see.
I would go through the advanced graph section of vrm and look at various data. Anything suspicions? Low voltage somewhere, something that doesn’t match expectation etc. Some turning points, where it start to discharge?
Over the last few days. System was put on Optimise with battery life. It was then not charging to 100% but then discharging to 7% following day 12%, 19% day after 28% day after. Was then switched to keep battery full the system then fully discharged.
