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Panasonic•EverVolt

Analysis by Marcus & Team

Panasonic EverVolt: HVAC Power Outage During Grid Loss

Troubleshoot Panasonic EverVolt not powering HVAC during outage. Diagnose battery capacity, inverter issues, transfer switch failure. Expert tips for residential systems.

Frequently Asked Questions

•What is the expected runtime of the EverVolt system with the HVAC load during an outage?

Runtime depends on battery capacity, SOC, and HVAC system power consumption. Consult the EverVolt system sizing tool for estimations.

•How can I determine if the ATS is faulty?

A multimeter can be used to verify voltage at the ATS input and output during a simulated outage. If voltage is not present on the backup side when the grid is down, the ATS may be faulty. Contact a qualified electrician for ATS replacement.

•What are the recommended charging settings for the EverVolt system to maximize battery life?

Refer to the Panasonic EverVolt owner's manual for recommended charging settings. Avoid deep discharge cycles to prolong battery life.

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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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How It Works:

The EverVolt system typically includes a battery inverter, a battery module (lithium-ion or LFP), and an automatic transfer switch (ATS). During a grid outage, the ATS should disconnect the home from the grid and connect it to the EverVolt inverter output. The inverter converts DC power from the battery to AC power to supply critical loads, including the HVAC system. Proper operation depends on adequate battery SOC, inverter functionality, and correct ATS operation.

Why This Happens:

Insufficient battery SOC to meet HVAC load demands.
HVAC load exceeding the EverVolt inverter's continuous power rating.
Faulty Automatic Transfer Switch (ATS) failing to switch to backup power.
Incorrect wiring or configuration of the critical loads panel.
BMS (Battery Management System) fault preventing discharge to HVAC.
Inverter fault preventing AC power output during backup operation.

Technical Recommendation:

Access the EverVolt service menu (refer to the system manual) to view detailed battery cell voltage readings and temperature data. Significant cell voltage imbalance can indicate a failing battery module, affecting the system's ability to provide backup power. Use an IR thermometer to check for hot spots on battery modules which can indicate a thermal runaway risk.

Safety Warning:

Battery systems operate at high DC voltages, posing a significant electrocution hazard. Always disconnect both AC and DC power sources before performing any maintenance or troubleshooting. Follow proper lockout/tagout procedures. Arc flash protection is required when working near energized equipment. Only qualified electricians should perform work on the EverVolt system. Refer to NEC 706 for legally required ESS (Energy Storage System) safety and system guidelines.

Recommended Action:

1

Verify battery SOC is above minimum threshold (e.g., 20%) using the monitoring app. If low, allow system to charge from the grid (if available) or solar. Use a multimeter to confirm DC bus voltage is within the normal operating range specified by Panasonic.
2

Check the HVAC load requirements (kW) against the EverVolt inverter's continuous power rating. An HVAC system with a high starting current may overload the inverter.
3

Inspect the ATS for proper operation during a simulated grid outage (consult the EverVolt system manual for safe testing procedures). Use a multimeter to verify AC voltage at the ATS input and output terminals on both grid and backup power sides.
4

Verify the critical loads panel wiring to ensure the HVAC system is connected to the designated backup power circuits.
5

Use the Panasonic service portal to check for any BMS fault codes. Perform a BMS reset if recommended by the manufacturer. Consult the Panasonic EverVolt troubleshooting guide for specific error code resolution.
6

Disconnect AC power to the EverVolt inverter and then DC power (following proper lockout/tagout procedures). Use a multimeter to check the inverter output voltage during a simulated outage. Contact a qualified electrician if the inverter fails to produce AC voltage.
7

Check for loose connections and proper torque on all electrical connections within the EverVolt system and the critical loads panel, following NEC 110.14.

Preventative Care:

Regularly monitor the EverVolt system performance via the monitoring app, paying attention to SOC, SOH, and any error messages.
Perform periodic visual inspections of the battery module for signs of physical damage or corrosion.
Ensure adequate ventilation around the EverVolt system components to prevent overheating.
Schedule annual licensed technician maintenance by a qualified electrician, including battery capacity testing and BMS calibration.
Keep the EverVolt system firmware updated to the latest version to benefit from bug fixes and performance improvements.