Further Information - Victron energy Pylontech UP2500 Manual

2020-11-10 02:54
grid, the inverter can draw more than the 25A limit to run the loads, make sure you have sufficient
batteries installed to keep the load per battery around this limit.
After charging the battery the charge current often changes between 0A and
25A.
This is caused by cell balancing inside the battery. This happens with new batteries and after a deep
discharge.
My system isn't charging at the rated capacity, or my PV is shutting down
Pylontech's BMS will restrict the Charge Current Limit of the battery in cold weather. The precise
temperatures and limits are not published by Pylontech, but anecdotally from reports on
Community it would appear that batteries begin to be limited below 18 degree C, severely limited
below 10 degrees C, and completely restricted from charging below 2 degrees C.
You can confirm if this is affecting your installation be entering the Pylontech Battery menu on your
GX device, and then the Parameters Menu. This will report the Charge Current Limit (CCL) and
Discharge Current Limit (DCL). This information is also logged in the advanced section of the VRM
monitoring portal.
My system only charges the battery to 52V
When DVCC is enabled, the battery (via the CAN-bms) is responsible for the charge voltage. The
Pylontech battery requests a charge voltage of 53.2V. We have however found that in practice this is
too high.
The Pylontech battery has 15 cells in series, so 53.2V equates to 3.55V per cell. This is very highly
charged and makes the system prone to go overvoltage.
It should also be noted that a LiFePO4 cell stores very little additional energy above 3.45V.
For this reason we opted to override the BMS and cap the voltage at 52V. This sacrifices almost none
of the capacity and greatly improves the stability of the system.
The battery won't charge to 100%
Also see the question above. The state of charge of the battery is estimated based on the overall
voltage and on how well balanced the internal cells are. Because we cap the battery voltage at 52V,
the state of charge will sometimes rise very slowly once it reaches the mid-90s. This is normal and
usually resolves over time.

10. Further Information

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