Have an updated ESS System running with the following new items:
Multiplus 5000
Pylontech US5000-1C
MPPT 150/85
all with latest firmware.
Setup and all parameters (incl. the EES assistant settings) as before (with Multiplus 3000, 2xUS2000C, MPPT 150/45 and same EM540).
Observed issue:
The US5000 is dropping below the lower ESS SoC limit (set to 20%). Without BatteryLife, ESS message is ESS #1, but the Pylontech is still discharging by 4W or 0,1A constantly. Removing the 48V connection from the MPPT delivers no changes. Seems like the 4W are disappearing in the Multiplus.
In the old setup the Pylontech discharging stops at lower SoC limit with ESS massage #1 and status “idle”…
Any ideas why this happens now with the new installation? Does the new US5000 at beginning may require some cell balancing with little charging and discharging?
First thanks to dognose for his reply and comments!
When the system has reached min SoC, discharging stops and the system starts charging the battery with little current (~0,5A) up to min SoC +1%. The charge current is dropping in ~10min to 0, then the battery shows “idel”, ~10min later the discharging of the battery starts again at 0,1A and this continues far below min SoC over time.
PV is disconnected!
The old installation had a hard stop at min SoC - w/o any little charging and any discharge of the battery.
What can be done to further check the installation and the settings?
SOC dropping comes from the MP – potentially caused by partial DC coverage. Pylontech US2000C and US5000-1C SOC displays is different. In US2000C the SOC display (idle or discharge) has a discharge threshold, a small discharge of ~0,1 A will not be recognized by the SOC display (but over time in the Victron remote console or the VRM – SOC is dropping over time with 0A discharge current). US5000-1C SOC display is more or less showing every discharging, also covering a discharge of ~0,1A.
Rgds,
