Victron energy Pylontech US3000 Manual page 13

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Step 3. Check the Pylontech manual

The Pylontech manual contains additional diagnostic and troubleshooting information, speciﬁcally

around decoding any indicator LEDs.

9. FAQ and Known Issues

The maximum charge and discharge current is limited to 25A, but the data

sheet tells me the maximum is 100A.

The maximum current is limited to keep the battery healthy and reach the 10 year guarantee. In oﬀ-

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 52.4V

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 52.4V. This sacriﬁces almost

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