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Panasonic•EverVolt

Analysis by Marcus & Team

Panasonic EverVolt State of Charge (SOC) Frozen

Troubleshoot Panasonic EverVolt showing frozen state of charge. Diagnose SOC errors, check BMS, cell voltages, and NEC safety compliance.

Frequently Asked Questions

•What is the DC voltage of the battery string?

Measure the DC voltage using a calibrated multimeter. Compare with the nominal voltage specified in the Panasonic EverVolt datasheet.

•Are there any error codes displayed on the inverter or monitoring app?

Record all error codes and consult the Panasonic EverVolt troubleshooting guide for possible causes and solutions.

•What is the ambient temperature around the battery system?

Use a thermometer to measure the ambient temperature. Ensure the temperature is within the operating range specified in the Panasonic EverVolt datasheet.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Safety Warning:

High DC voltage is present within the Panasonic EverVolt system. Always disconnect both AC and DC power before performing any inspection or maintenance. Wear appropriate personal protective equipment (PPE), including insulated gloves and safety glasses. Only qualified electricians should perform work on the battery system. Adhere to NEC 706 for ESS systems and rapid shutdown requirements.

Symptoms:

Panasonic EverVolt battery system displays a static State of Charge (SOC) at 50%, despite charging or discharging. Monitoring app and local display show the incorrect SOC.

Step-by-Step Fix:

1

Disconnect the AC power to the EverVolt system by switching off the AC breaker. Verify zero AC voltage with a calibrated multimeter.
2

Engage the DC disconnect switch on the EverVolt unit. Confirm zero DC voltage between the positive and negative terminals using a calibrated DC multimeter. Adhere to NEC rapid shutdown requirements.
3

Inspect the CAN bus communication cables between the battery module and the inverter for damage or loose connections.
4

Use the Panasonic EverVolt service tool (requires technician login) to check individual cell voltages within the battery module. Note any significant voltage imbalances (> 0.1V).
5

Using the service tool, initiate a BMS reset or recalibration procedure as outlined in the Panasonic EverVolt service manual.
6

Monitor the SOC during a full charge and discharge cycle to observe if the issue persists.
7

If the problem persists, contact Panasonic technical support for further diagnostics and potential battery module replacement under warranty. Qualified electrician required.

How It Works:

The Panasonic EverVolt utilizes a Battery Management System (BMS) to monitor cell voltages, temperature, and current. The BMS calculates the SOC based on these parameters and communicates it to the inverter and monitoring system. SOC estimation relies on accurate cell voltage readings, current integration, and temperature compensation. Communication occurs via CAN bus.

Possible Causes:

Faulty cell voltage sensor within the battery module leading to inaccurate SOC calculation.
BMS software error or corruption causing incorrect SOC reporting.
CAN bus communication failure between the battery module and the inverter.
DC current sensor malfunction resulting in inaccurate current integration for SOC calculation.
Battery cell imbalance affecting SOC estimation accuracy.
High internal resistance within a battery cell triggering premature SOC cutoff.

Maintenance Tips:

Perform regular firmware updates to the EverVolt system as released by Panasonic.
Periodically check the battery module temperature via the monitoring app. Ensure adequate ventilation around the unit to prevent overheating.
Monitor the battery SOC during normal operation to identify any unusual behavior early.
Schedule annual inspection by a qualified technician to check for loose connections and perform basic system diagnostics.