Subject: Assistance Needed with Battery Charging Issue
Good day,
My Off-Gridd Installation is running for 6 year now and I have been struggling with the following issue for a few days.
The battery was deeply discharged (there is still a 48 V / 12 V converter connected) on 2 Pylontech US2000 batteries at approximately 8 % state of charge (SOC), which I now understand under the SOC value lag.
With my low-cost 3 kW generator, I was unable to start a charging process (which has worked previously, several times, although this time with extreme cold).
I then procured a Hyundai diesel generator with 5 kW, which was able to start the charging process, charging at 1,000 W at 0 °C. However, this did not last long and the charging stopped; now the input current is no longer detected at all.
Over the following 2–3 days, I noticed that in the morning I was able to charge again, this time with 10 A set. It also failed again, and eventually the system only charges at 5 A even though 10 A is allowed — until the input current is no longer recognized.
bynow the batterie has 30 % and a temperature10 celsius, so it should work charge normaly.
In the VEConfigurator, the AC input is marked in red, and I do not see any frequencies from the generator.
It is also notable that the AC output suddenly dropped. This could also be due to an incorrect ESS configuration.
Steps already taken:
-
Complete system restart, BUS CAN disconnected and reconnected
-
Batteries re-synchronized, LEDs green
-
ESS Assistant run with and without batteries — no solution
I hope you can assist me with this problem.
I have exported my configuration below.
Thank you very much.
TAB: General
System frequency 50Hz
Shore current 16.0 A
Overruled by remote checked
Dynamic current limiter checked
External current sensor connected (see manual) unchecked
State of charge when Bulk finished 95.0 %
Battery capacity 100 Ah
Charge efficiency 0.95
TAB: Grid
Country / grid code standard Other: not compliant to any grid code standard
AC input 1 Above selected gridcode plus LOM B (safe)
Accept wide input frequency range (45-65 Hz) checked
AC low switch mains off 180 V
AC low switch mains on 187 V
AC high switch mains on 265 V
AC high switch mains off 270 V
UPS function unchecked
TAB: Inverter
PowerAssist unchecked
Inverter output voltage 230 V
Inverter DC shut-down voltage 37.20 V
Inverter DC restart voltage 43.60 V
Low DC alarm level 43.60 V
Do not restart after short-circuit (VDE 2510-2 safety) unchecked
enable AES unchecked
TAB: Charger
Enable charger checked
Weak AC input checked
Stop after excessive bulk unchecked
Lithium batteries checked
Charge curve Fixed
Absorption voltage 52.00 V
Float voltage 51.00 V
Charge current 20 A
Repeated absorption time 1.00 Hr
Repeated absorption interval 7.00 Days
Absorption time 1 Hr
TAB: Virtual switch
TAB: Usage
Virtual switch usage Do not use VS
TAB: Assistants
TAB: Assistant Configuration
Assistants not used