Problematic Pylontech batteries? Read on to find out how Electrikcollective Ltd were able to trouble shoot and fix a problem with hibernating Pylontech batteries.
We were contacted by a customer who had a problem with is 4 x 2.5kW Pylontech batteries; the batteries were not taking a charge, and the inverter was displaying an alarm.
On investigation, it became clear that the batteries had gone into a state of hibernation. likely caused by not being shut down properly and/ or other electrical works at the site. The first solution was to set the inverter to ‘force charge’ mode but because the batteries were in a state of ‘deep hibernation’ this didn’t work.
The batteries were disconnected from the system and brought to our workshop. The batteries were still under a 5-year warranty, so it was imperative that the manufacturer was contacted before any further investigations were carried out which might void this warranty.
Each battery case was opened and the BMS (battery management system) was bypassed. The power packs inside were then connected directly to an external power supply, which slowly brought them out of deep hibernation. The batteries were then re-assembled and connected to a test inverter. The four Pylontech batteries were then cycled through a full charge/ discharge sequence to establish that they would now take a charge from the inverter. They were then returned to the customer’s property and reconnected to the system. The inverter then was able to charge the batteries as normal and displayed no further alarms.