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Adds PV strings 7 through 18 for Fox R series inverters

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@FozzieUK FozzieUK released this 30 Sep 11:01
3a23756

Foss ESS R Series Inverters - 18 PV strings

As the R series inverters support up to 18 PV strings, this release extends the PV string entities from 6 and adds PV7-18 (each PV string has volt, power and current entities)

As most people do not have more than 6 PV strings, to minimise 'unknown' sensors this option has to be enabled in the config. This is done by adding the extra switch to the Platform statement in configuration.yaml with extendPV: true as follows -

  - platform: foxess
    deviceID: enter_your_inverter_id
    deviceSN: enter_your_inverter_serial_number
    apiKey: enter_your_personal_api_key
    extendPV: true

Speeded up API performance

Now the OpenAPI is performing well, the enforced 5 second delay between API calls has been reduced to 2 seconds making startup much faster.

Fixed a bug with Error 41200 burning through personal API calls

In some rare cases users have reported that the device variables call fails with a Fox api error 41200 - this appears to be an internal error generated by the API where some of the returned data is invalid (most often the 'currentFault' variable). See #268