Not sure what actually fixed it, but it’s working now. I did a factory reset on the EW11 before the start of the day. It doesn’t seem like I did anything else that I didn’t try yesterday, but I’ll take luck over understanding (for now)! The working settings ended up being very close to factory defaults. I think all I changed was Protocol from None to Modbus and Local Port from 8899 to the standard modbus port, 502.
My best guess is that there was a problem in the wiring in my initial attempts. It was common to see no data received when checking the EW11 status page. I’m pretty sure I had all of the settings the way they ended up working multiple times before it actually worked. I basically stopped troubleshooting after I got it working, so I’m not even sure what changes would break it (Local Port, etc.).
Working HA config
Configuration.yaml (modbus):
modbus:
- type: tcp
host: 192.168.1.232
port: 502
name: hub1
- type: serial
name: hub2
method: rtu
port: /dev/ttyUSB0
baudrate: 115200
stopbits: 1
bytesize: 8
parity: N
Note on above: I left the serial hub lines in there in case someone needs them, but they’re not actually active in my system.
Configuration.yaml (sensors):
- platform: modbus
registers:
- name: Battery
hub: hub1
unit_of_measurement: V
slave: 01
register: 13082
register_type: input
scale: 0.01
precision: 2
- name: Solar #3100
hub: hub1
unit_of_measurement: V
slave: 1
register: 12544
register_type: input
scale: 0.01
- name: Solar Power L # 3102
hub: hub1
unit_of_measurement: W
slave: 01
register: 12546
register_type: input
scale: 0.01
- name: Solar Current # 3101
hub: hub1
unit_of_measurement: A
slave: 01
register: 12545
register_type: input
scale: 0.01
precision: 2
- name: Load # 310E
hub: hub1
unit_of_measurement: W
slave: 01
register: 12558
register_type: input
scale: 0.01
Note on above: there’s more data available, these are just the ones I was interested in. See the linked PDFs in the OP for more. Commented values are the hex values from the PDF, and the registers are the decimal equivalents.
Working EW11 Config
GitHub Gist Page | Direct download: ew11-config.xml (Probably want to change SSIDs and passwords)
I still want to get MQTT working, and also set up a couple switches through modbus or MQTT. I’ll try to document further, but I’m on to other projects first. One thing I definitely need to record is if the Blue (3 & 4) or Green (5 & 6) wires actually correspond to modbus A+. Epever lists them differently in different places, and I never found a definitive list which corresponds to the various model numbers.