Fox ESS P1-5.0-E and ELFIN EW11A - Modbus / HA

[lemon]

Hello everyone,

I've been spending the past few days trying to setup the modbus connection between my inverter and the Elfin EW11A, with no success (following https://github.com/nathanmarlor/foxess_ ... Elfin-EW11).

I've triple checked all connections, restarted the inverter, checked cable continuity with a multimeter, used the Modbus Android app to send commands to the Elfin device, with no avail.
While the Elfin seems to be responding, the responses seem to be blank (in the Android app I'm using). I haven't tried the Modbus command line utility for Windows yet.

In HA, I get the following error:

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foxess Details: Modbus Error: [Input/Output] Modbus Error: [Invalid Message] No response received, expected at least 8 bytes (0 received)

I can share photos of everything, but I was just wondering if there's any hidden step somewhere that I've missed? I'm really lost at this point, wondering if I got a faulty Elfin device ...

Appreciate any help!

[Dave Foster]

The error message implies it is talking to the Elfin but received no response to it’s message - common errors at this point would be in the wiring i.e. wrong pins used on the inverter (some inverters number the connectors from the front), RS485A crossed over i.e. it should be A>A, B>B.

Then there is the slave ID setting in the inverter go to Settings, Communication, RS485 settings and make sure Slave is set to 247.

I’ve never used the Elfin but adaptors are much the same and common mistakes in the settings will give the same error, usually baud rate not set correctly, and Protocol must be Modbus.

[lemon]

Ok, I think I'm getting somewhere - I re-did the cabling, got a thicker eletric cable and now I get this:

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Details: Inverter model not supported: 'P1-5.0-E'

I thought H1 / P1 were the same thing, apparently not?

[lemon]

Ok, finally got it to work - I had to edit the settings a bit, as described here, to trick HA to use P1 as an H1-G2.

For future reference, I used a thicker wire and made sure to push it all the way into the connector. Once that worked, I made sure to really clamp the wire I was using previously and that worked too

So, as Dave mentioned, the connection was the problem, even though the multimeter was giving me signal.

[Dave Foster]

Glad you got it working, in the longer term we’ll need to get the ‘P’ 1 added to the integration.