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Temperatures

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TonyM1958 edited this page Feb 25, 2024 · 18 revisions

Fox present a number of temperatures. It helps to understand what each of these may be showing:

  • Ambient Temperature: this is mis-named and is called Inner Temperature on some models. It is the temperature measured inside your inverter around the power electronics. As a result, this is normally the highest temperature you see. Temperatures up to 54C are considered 'normal' and often occur when force charging from grid for a hour or more. If this temperature goes too high, the inverter will reduce it's load or shut down until the temperature returns to safe levels.
  • Inverter Temperature: this is the temperature of the heat vanes on the back of your inverter. Normally lower than the Inner Temperature.
  • Battery Temperature: this is the temperature inside the BMS around the power electronics (called BMS Temperature in this integration). It is not the temperature of the battery cells.
  • DSP Temperature, Boost Temperature, Charge Temperature: these are specific to the internal temperature of the power electronics in different inverter models, such as 3 phase systems. They return 0 on H1 models.
  • Cell Temperature: HV2600 v1 has 16 cells and 8 temperature sensors in each battery, while HV2600 v2 has 16 cells and 7 temperature sensors. If you have 4 x HV2600 batteries, the BMS is monitoring between 28 and 32 temperature readings. Other batteries have similar numbers of temperature sensors. The raw cell data can be accessed in the Fox App v2.0 via Inverter, Settings. Ignore values of -50C as these are placeholders for batteries with different numbers of sensors.
  • BMS Cell Temperature High / Low: For simplicity, the BMS reports the maximum (high) and minimum (low) temperature it is seeing across all of the cells via RS485 modbus. These values are reported in Home Assistant, if you have this setup. From Fox App v2.0.9, BMS Cell Temperature Low is shown on the battery screen instead of BMS temperature

This integration presents temperatures like this:

Battery Cell Temperature is calculated as the average of the BMS Cell Temp High and Low.

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