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FranklinWH•aPower

Analysis by Marcus & Team

FranklinWH aPower Error 3005: BMS Failure Fix

Troubleshoot FranklinWH aPower Error 3005. Diagnose BMS failure, check cell voltage, and ensure safe residential battery storage operation.

Frequently Asked Questions

•What is the typical DC voltage of the FranklinWH aPower system?

The typical DC bus voltage is around 400VDC.

•How often should the FranklinWH aPower system have its firmware updated?

The firmware should be updated regularly, ideally whenever a new version is released by FranklinWH.

•What NEC article governs battery storage system installations?

NEC Article 706 covers the installation of energy storage systems.

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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:

Working with battery storage systems involves high DC voltages. Improper handling can result in severe electric shock, arc flash, or thermal runaway leading to fire. Always disconnect both AC and DC power before performing any maintenance or troubleshooting. Only qualified electricians familiar with NEC Article 706 and battery storage systems should perform repairs. Ensure rapid shutdown functionality is operational and compliant with NEC 690.12.

Solution:

1

Disconnect the AC power to the aPower system at the main breaker.
2

Locate and open the DC disconnect switch for the aPower battery system. Verify 0VDC using a calibrated multimeter before proceeding.
3

Inspect all visible wiring connections to the aPower system, checking for loose connections or damage.
4

Consult the FranklinWH system manual for specific troubleshooting steps for Error 3005.
5

Using the FranklinWH monitoring app or installer portal, attempt to retrieve detailed BMS error logs. Note cell voltages, temperatures, and error timestamps.
6

Contact FranklinWH technical support with the error logs for further assistance and potential firmware updates or hardware replacement.
7

After resolving the error, re-energize the system by closing the DC disconnect and then the AC breaker. Monitor system performance via the app. Ensure compliance with NEC 706.15.

Symptoms:

The FranklinWH aPower system displays Error 3005, indicating a Battery Management System (BMS) failure. The system may cease charging or discharging, and backup power functionality might be unavailable.

Technical Overview:

The FranklinWH aPower system utilizes a BMS to monitor and control the lithium-ion battery pack. The BMS measures cell voltages, temperature, and current. Error 3005 typically indicates a critical fault within the BMS, preventing safe and efficient operation. The BMS communicates with the inverter and other system components via CAN bus, relaying critical data and control signals. The DC bus voltage is typically around 400VDC.

Preventative Care:

Ensure the aPower system is installed in a well-ventilated area to prevent overheating.
Regularly monitor the system's performance through the FranklinWH app, paying attention to cell voltages, temperature, and SOC.
Keep the system firmware updated to the latest version.
Schedule annual preventative maintenance checks by a qualified technician.
Perform a battery capacity test every 2 years to assess SOH.