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Temperatures

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TonyM1958 edited this page Jun 13, 2023 · 18 revisions

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Fox has a number of temperature sensors, so it helps to understand what each of these show:

  • 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.
  • Inverter Temperature: this is the temperature of the heat vanes on the back of your inverter. This is normally significantly lower than the Inner Temperature.
  • Battery Temperature: this is the temperature inside the BMS around the power electronics (so I label this BMS Temperature). It is not the temperature of the battery cells.
  • BMS Cell Temperature High / Low: these temperatures are available via an RS 485 connection. The BMS monitors the temperature of every cell in the batteries. Inside HV2600, for example, there are 16 cells per battery. So, if you have 4 x HV2600, the BMS is measuring the temperature of all 64 cells. This data is reported in the installer account in the Fox app. For simplicity, the BMS also reports the maximum (high) and minimum (low) temperature across all the cells.
  • DSP Temperature, Boost Temperature, Charge Temperature: these are specific to different inverter models and mostly return 0 on systems I have seen.

This integration presents these temperatures like this:

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

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